Online Calculators

3D Distance Calculator

Find 3D point distance, midpoint and direction using coordinates or pasted triples.

457 Plan Calculator

Project a 457(b) balance using employee and employer deposits, age-based contribution caps, fees and inflation.

AC Current Calculator

Estimate single-phase or balanced three-phase current from real power, apparent power or motor output.

Accounts Receivable Turnover Calculator

Calculate receivables turnover and collection days from net credit sales and either opening/closing balances or a known receivables average.

Accrued Interest Calculator

Calculate simple interest from actual days or calendar dates, including successive intervals with changing balances and rates.

Age Calculator

Find calendar age, elapsed days and months, and the next birthday’s date and weekday.

Angle Converter

Convert a numeric angle or separate signed degrees, arcminutes and arcseconds between plane-angle units.

Annuity Present Value Calculator

Value equal payments or find the payment for a present-value target, using a per-period, nominal annual or effective annual discount rate.

Appliance Electricity Cost Calculator

Estimate electricity costs from appliance power and usage or measured daily, weekly or monthly kWh.

Area Calculator

Calculate areas of rectangles, triangles, circles, ellipses, parallelograms, and trapezoids.

Area Converter

Convert a known area or rectangle dimensions into square metric and customary units, acres or hectares.

Arithmetic Sequence Calculator

Find arithmetic terms and sums from a common difference or the first two terms, with opening and final-term evidence.

Asphalt Calculator

Estimate asphalt weight and material cost from a known area or rectangle, with metric or US-tonne quote choices.

Attendance Calculator

Calculate classes needed for an attendance target and plan the remaining semester.

Audio File Size Calculator

Estimate PCM or encoded audio size, or the recording duration that fits a storage budget.

Auto Loan Calculator

Estimate car payments and compare interest savings from extra monthly payments.

Balloon Loan Calculator

Estimate balloon loan payments, combined maturity amount and extra-payment savings.

Baluster Spacing Calculator

Plan minimum or chosen baluster counts, equal level-rail gaps and running centers in inches or millimetres.

Battery Charge Time Calculator

Estimate charging time or the modelled current needed for a time budget, with an optional entered taper allowance.

Battery Runtime Calculator

Estimate battery runtime from capacity and a total watt load, load-side current or an editable device list.

Uncompressed Image Size Calculator

Plan uncompressed image storage by total pixel depth or channel count and channel depth.

BMI Calculator

Calculate adult body mass index in metric or US customary units.

Board and Batten Calculator

Plan equal wall battens from a maximum center or clear-gap spacing, or a chosen count, with running marks.

Board Foot Calculator

Calculate board feet for one board size or a mixed lumber list, with an allowance and volume-based cost.

Body Fat Calculator

Estimate adult body-fat percentage and fat mass using the Deurenberg BMI, age, and sex equation.

Body Surface Area Calculator

Estimate body surface area with Mosteller and Du Bois formulas and compare both results.

Bond Price Calculator

Estimate a fixed-coupon bond’s coupon-date price or nominal annual yield from its face value, coupon and remaining payments.

Book Spine Calculator

Plan paperback spine and cover dimensions using sheet caliper or a measured paper stack.

Break-Even Calculator

Find whole-unit break-even and target-profit sales, with an optional profit or loss scenario for expected sales.

Brick Calculator

Estimate face bricks from wall dimensions or known net area, actual brick size, joints, layers and waste.

Budget Calculator

Allocate take-home income by pay period, then compare monthly category totals or itemized expense rows with custom or preset budgets.

Burn Rate Calculator

Calculate monthly cash burn and runway from operating flows, starting/ending cash balances, or a known net burn rate.

Business Days Calculator

Count, add or subtract business days with chosen working weekdays and your closure dates. Set interval endpoints, or move from a start date treated as day zero.

CAGR Calculator

Calculate annualized growth, or solve a starting value, ending value or period from a supplied annual rate.

Calorie Calculator

Estimate adult resting energy and daily calorie needs from activity level.

Calories Burned Calculator

Estimate total and above-rest activity calories using duration, body weight, and published MET values.

Capacitor Energy Calculator

Calculate ideal capacitor energy, solve voltage or capacitance, and estimate energy released above a cutoff.

Carpet Calculator

Compare full-width carpet strips in two room directions to estimate roll length, ordered area, seams, and material cost.

Cash Conversion Cycle Calculator

Calculate the cash conversion cycle from day measures or financial balances, with opening and closing averages and component working.

CGPA to Percentage Calculator

Convert a ten-point CGPA or credit-weighted semester GPA to percentage, or reverse a verified linear formula.

Chi-Square Goodness of Fit Calculator

Compare observed and expected counts with a chi-square statistic, tail p-value, and count screen.

Churn Rate Calculator

Calculate customer churn from losses or ending counts, then see retention and a constant-rate projection over repeated periods.

Circle Calculator

Calculate a circle’s radius, diameter, circumference, and area from one known measurement.

Circular Segment Calculator

Find a circular segment’s area, arc and perimeter from radius with angle, height or chord.

Click Through Rate Calculator

Calculate CTR, clicks or impressions, find minimum whole clicks for a target, and compare two campaign rates with percentage-point differences.

Coefficient of Variation Calculator

Compare relative spread from supplied summaries or two raw datasets.

Commission Calculator

Calculate sales commission, a representative’s split, and gross pay including base compensation.

Complex Number Calculator

Calculate with rectangular or polar complex operands and compare magnitude, angle and conjugate.

Compost Calculator

Plan a compost amendment or surface layer from area or bed dimensions, with bag sizes in cubic feet or liters and an ordering allowance.

Compound Interest Calculator

Project compound growth over years and months with monthly deposits and optional rate comparisons.

Concrete Block Calculator

Estimate whole concrete blocks from wall dimensions or net area, nominal face size and waste, with material cost.

Concrete Calculator

Estimate concrete for rectangular slabs from dimensions or known area, quantity, allowance and product bag yield.

Concrete Weight Calculator

Calculate concrete mass from known volume, area and thickness, or slab dimensions with a supplied density.

Confidence Interval Calculator

Estimate a mean with a known-spread z or sample-spread t interval, or a Wilson proportion interval.

Contribution Margin Calculator

Calculate contribution per unit, contribution margin ratio, and total contribution from unit inputs or period totals.

Conversion Rate Calculator

Calculate conversions per eligible interaction, plus the conversions implied by a target rate for the same traffic volume.

Correlation Calculator

Compare Pearson value correlation and Spearman rank correlation for the same paired observations.

Cost Per Click Calculator

Calculate average CPC from spend and clicks or CPM and CTR, and estimate budget or clicks at a chosen average cost.

CPM Calculator

Calculate CPM, campaign budget or estimated impressions, and optionally compare two campaigns on cost per 1,000 impressions.

Credit Card Interest Calculator

Estimate cycle interest and compare an earlier or later card payment under daily balance methods.

Credit Card Payoff Calculator

Find card payoff time or the monthly payment needed for a repayment goal.

Crop Factor Calculator

Compare diagonal crop and lens framing with sensor presets and angles of view.

Vegetable Yield Calculator

Estimate vegetable harvest or the whole planted count needed for a target, using retained plant-count or row-spacing entry and pounds or kilograms.

Current Ratio Calculator

Calculate current ratio and net working capital from known totals or individual current balance-sheet items.

Customer Acquisition Cost Calculator

Calculate acquisition cost per new paying customer from sales and marketing totals or an itemized expense list.

Customer Lifetime Value Calculator

Estimate customer lifetime revenue and gross-margin value from subscription churn or repeat purchases over a known lifespan.

Data Storage Converter

Convert one data amount or repeated equal-size files between bits, bytes and explicit decimal or binary units.

Date Difference Calculator

Compare two dates in either order, or require a forward interval. See calendar duration, total days, weekdays and equivalent time units, with explicit endpoint counting.

Day of the Week Calculator

Find the weekday, day of year and ISO week date for a Gregorian date. Choose a day from the month calendar, move between months or jump to today.

Debt Service Coverage Ratio Calculator

Calculate DSCR from monthly or annual available income and total debt-service payments or separate principal and interest.

Debt Snowball Calculator

Plan payments across multiple debts and compare snowball and avalanche payoff time, interest and monthly balances.

Debt To Equity Calculator

Calculate liabilities relative to positive book equity, entering known equity or deriving it from balance-sheet assets.

Debt-to-Income Calculator

Calculate DTI from monthly or annual income and total or itemized monthly debt payments.

Decimal Hours Calculator

Convert durations between hours, minutes, seconds, and decimal hours for timesheets.

Decimal to Fraction Calculator

Convert finite or repeating decimals to exact fractions, with recurring digits entered together or in separate fields.

Deck Board Calculator

Compare parallel decking directions, stock-board quantities, allowance and material cost.

Depreciation Calculator

Inspect full-year depreciation schedules using straight line, double declining balance or sum of years’ digits.

Discount Calculator

Find sale price, original price, or discount rate, with stacked discounts, coupons and optional tax.

Dividend Yield Calculator

Calculate annualized dividend yield, yield on cost, and gross income from a per-share payment and payment frequency.

Download Time Calculator

Estimate transfer time or required connection speed for a download deadline.

Drip Irrigation Runtime Calculator

Find drip watering time or delivered water from emitter ratings, an entered zone flow or timed collection, with an optional supply-flow comparison.

Drywall Calculator

Estimate drywall sheets and material cost from room dimensions or known net surface area.

Due Date Calculator

Estimate a pregnancy due date from a last period, known conception date, ultrasound age, or IVF transfer.

Effective Annual Rate Calculator

Convert nominal, effective and periodic rates, including custom intervals and continuous compounding, and compare equivalent quotes.

Ellipse Calculator

Find ellipse axes, foci and eccentricity from axes or a known eccentricity or focus distance.

Emergency Fund Calculator

Plan emergency savings from a monthly expense total or itemized bills, and find the time or regular saving needed to reach your target.

EMI Calculator

Find EMI or loan amount from a monthly budget, using total months or years plus months.

Energy Converter

Convert a known energy amount or constant power over an entered duration into supported energy units.

EOQ Calculator

Find a cost-minimizing order quantity from annual costs or a carrying rate, with optional pack-size and current-order comparisons.

Etsy Fee Calculator

Estimate Etsy order profit or find a target-profit item price, using seller-country fees, discounts and capped Offsite Ads.

EV Charging Calculator

Estimate EV charging to a target or within available hours, including energy, per-minute and session charges.

Exponent Calculator

Calculate real powers from decimal or fraction exponents, including negative bases with an odd reduced denominator.

Exposure Calculator

Find an equivalent shutter time after aperture, ISO or neutral-density filter changes.

Fence Material Calculator

Estimate pickets, rails, posts and component cost for a straight run or a list of fence runs.

Fertilizer Application Calculator

Find dry fertilizer weight for an entered nitrogen, phosphate or potash target, with area/rate units, retained bag sizes and purchasing cost.

FFMI Calculator

Calculate fat-free mass index from body mass, body-fat percentage, and height.

Final Grade Calculator

Find a required exam score or predict your course grade from a current average or weighted grade rows.

Fixed Deposit Calculator

Estimate gross deposit receipts or solve for the opening deposit, with day, month or year terms and separate interest payout schedules.

Flow Rate Converter

Convert volumetric flow to a selected metric, US gallon or Imperial gallon unit and compare equivalents.

Four-Function Calculator

Calculate decimal expressions using a touch keypad or keyboard, with memory, answer reuse and a session history.

Fraction Calculator

Calculate with fractions or mixed numbers, reduce the answer, and see the working and equivalent forms.

French Drain Calculator

Estimate gravel minus optional pipe displacement and size fabric wraps and rolls for a French drain.

Fuel Economy Converter

Convert a fuel rating or measured trip distance and fuel used between consumption and economy units.

Garden Watering Calculator

Plan water volume or session minutes from a chosen depth budget, rain and efficiency, with imperial/metric entry and measured flow.

GCD and LCM Calculator

Find exact greatest common divisors and least common multiples for two integers or a pasted list.

Geometric Sequence Calculator

Find geometric terms and finite or convergent infinite sums from a multiplier or the first two terms.

GPA Calculator

Calculate semester and cumulative GPA from course rows or spreadsheet imports, and plan a target GPA.

Grade Calculator

Calculate a points-based or weighted course grade and plan the score needed on upcoming work.

Grass Seed Calculator

Plan grass seed from a label rate or bag coverage, with retained area/rate/bag units, ordering allowance and whole-bag costs.

Gratuity Calculator

Estimate monthly-rated gratuity from qualifying wages and service entered as a duration or calendar dates.

Gravel Calculator

Estimate gravel volume, weight and supplier-quoted material cost from an area, rectangle or circle.

Grout Calculator

Estimate grout packages and material cost from tile joints or entered manufacturer package coverage.

GST Calculator

Add or extract GST at your entered rate, with numerical working, currency labels and optional Indian tax components.

Harmonic Mean Calculator

Find equal-weight or weighted harmonic means of positive values and compare the corresponding arithmetic mean.

Heat Pump Cost Calculator

Estimate heat-pump electricity and running cost from heat energy or output hours, and compare resistance or fuel heating.

HRA Exemption Calculator

Estimate exempt and taxable HRA from period totals, monthly amounts, or separate periods with changed salary, rent or city.

Ideal Weight Calculator

Compare four historical ideal-body-weight equations from adult height and sex-specific coefficients.

Image Aspect Ratio Calculator

Resize proportionally into a custom or preset frame and see borders or cropped area.

Inflation Calculator

Adjust a price forward or backward using an annual inflation assumption or two entered values from one price-index series.

Insulation Calculator

Estimate insulation package quantities and nominal material R-value from area, coverage, and thickness.

Integer Calculator

Evaluate signed whole-number expressions with parentheses and exact fractions, then inspect each arithmetic step.

Interest Only Loan Calculator

Compare interest-only and later loan payments, including optional early principal repayment.

Internal Rate of Return Calculator

Solve the annual IRR for one initial investment followed by nonnegative yearly cash inflows, with a unique-root cash-flow model.

Interquartile Range Calculator

Find quartiles, IQR, and outlier fences using interpolation or medians of halves.

Inventory Turnover Calculator

Find inventory turns and days held from opening and closing balances or a known average, using the measured period at cost.

Investment Fee Calculator

Compare how two annual fee rates affect the same investment over time.

Investment Growth Calculator

Project annual investment growth or find contributions needed for a future goal.

ISO Week Calculator

Find a date’s ISO week number, week year, and Monday-to-Sunday range.

Large Number Calculator

Calculate large decimals and integers, preserve full results, and choose rounding for division and square roots.

Law of Cosines Calculator

Find a missing triangle side from two sides and their angle, or find an angle from three sides.

Lean Body Mass Calculator

Estimate non-fat body mass using Boer’s height-weight equation or calculate it from a supplied fat percentage.

LED Resistor Calculator

Choose an E12 or E24 LED resistor or check an existing value, with per-string current, power and repeated-string totals.

Length Converter

Convert decimal distances or combined feet and inches between metric, customary and nautical units.

Linear Interpolation Calculator

Find y from x or x from y on a line between two known points, with slope and explicit extrapolation.

Linear Regression Calculator

Fit a least-squares line, predict an outcome, and inspect residual error and the fitted equation.

Loan Affordability Calculator

Find loan principal from a payment budget or a total monthly budget after reserved costs.

Loan APR Calculator

Estimate fee-adjusted loan APR using currency or percentage fees and compare effective annual cost.

Loan Calculator

Compare fixed monthly loan payments, flexible monthly terms and extra-payment savings.

Loan Comparison Calculator

Compare loan payments and interest plus fees over the full term or a chosen holding period.

Logarithm Calculator

Calculate a selected-base logarithm and compare common, natural and binary logarithms of the same positive number.

Long Division Calculator

Divide whole numbers or finite decimals with exact quotient, original-unit remainder, decimal expansion and scaled division steps.

Lumpsum Investment Calculator

Project one investment or find the initial lump sum needed for a future target.

Macro Calculator

Convert a daily calorie target and a chosen macro split into protein, carbohydrate, and fat grams.

Matrix Determinant Calculator

Edit square matrix cells or paste rows to find a determinant and inspect its pivots and row swaps.

Matrix Multiplication Calculator

Edit or paste compatible matrices, multiply them and inspect row-by-column working for a selected result cell.

Mean Absolute Deviation Calculator

Calculate average absolute distance from the mean using a list or value frequencies.

Mean, Median & Mode Calculator

Find mean, median, modes, and a frequency breakdown from individual numbers or counts.

Modulo Calculator

Find exact nonnegative modulo results for safe or large integers and compare the signed truncating remainder.

Monthly Recurring Revenue Calculator

Normalize subscription plans into MRR and annual run rate, with separate plan rows and optional previous-MRR comparison.

Mortar Calculator

Enter a masonry count or measure a wall, then use your product’s stated units-per-bag yield to estimate whole mortar bags and cost.

Mortgage Calculator

Estimate mortgage and housing payments with amount or percentage down payment and quoted mortgage insurance.

Mortgage Points Calculator

Compare mortgage points, payment break-even and net savings through your planned holding period.

Mulch Calculator

Estimate mulch for known area, a rectangle or a circle, with excluded area, depth and bag units, ordering allowance and bulk quote units.

NEET Marks Calculator

Estimate NEET subject and total scores from awarded counts or attempted and wrong answers.

Net Present Value Calculator

Discount annual net cash flows and subtract an initial investment to calculate NPV and the present value of future cash flows.

Net Worth Calculator

Estimate net worth from category totals or itemized balances with independent asset and debt shares.

Normal Distribution Calculator

Calculate normal-model probabilities or find the cutoff for a chosen percentile.

OEE Calculator

Calculate OEE from planned time or shift and breaks, with good or rejected counts and reconciled loss minutes.

Ohm’s Law Calculator

Solve voltage, current, resistance and DC power from any two known quantities with selectable electrical units.

One Rep Max Calculator

Estimate a one-repetition maximum from a completed set and compare Epley and Brzycki predictions.

Ovulation Calculator

Estimate ovulation and a six-day fertile window using the calendar cycle-day convention.

Pace Calculator

Convert a recorded distance and duration into pace, speed, and constant-pace race times.

Paint Calculator

Estimate paint from a room or known net area, product coverage and coats. Include a ceiling or measured opening deductions, then round to your actual container size.

Paper Weight Calculator

Estimate paper and packaged weight from physical sheets or single/duplex page counts.

Parallel Resistor Calculator

Add or paste up to 100 parallel or series resistors, with retained unit conversion, component loading and tolerance limits.

Paver Calculator

Measure a rectangle or enter a paved area. Estimate whole packs from supplier coverage or individual rectangular pavers, then calculate base, bedding and paving cost.

Payback Period Calculator

Estimate simple and discounted investment payback from constant or uneven annual net cash flows.

Percent Error Calculator

Compare measured and reference values with absolute and signed percent error and an optional entered tolerance range.

Percentage Calculator

Find percentages, percentage change, a whole amount, or a value after adding or subtracting a percentage.

Percentage Difference Calculator

Compare two values or percentage rates using a symmetric average base, with a separate percentage-point gap for rates.

Percentile Calculator

Find an interpolated or nearest-rank percentile from observations or value frequencies.

Period Calculator

Estimate upcoming period dates from your last start date, average cycle length, and bleeding duration.

Permutation and Combination Calculator

Count ordered sequences and unordered selections of distinct item types, with or without replacement.

Photo Storage Calculator

Estimate photo storage, RAW plus JPEG card capacity and space for backup copies.

Pixel Density Calculator

Calculate screen PPI from its diagonal or find the diagonal for a target density.

Plant Spacing Calculator

Count aligned or staggered planting rows with edge margins, orientation comparison, retained bed units and repeated-bed totals.

Plywood Calculator

Estimate sheet purchases for a measured surface using custom panel dimensions and waste.

Potting Soil Calculator

Plan mix or pots filled from available bags using tapered, cylindrical, rectangular or known-volume containers, with retained dimensions and bag units.

Power Converter

Convert a known power rate or derive interval-average power from energy and elapsed duration.

Power Factor Calculator

Find power factor from P/S, a sinusoidal power triangle or real power with single-phase or balanced three-phase RMS measurements.

PPF Calculator

Project PPF deposits and year-end interest using monthly, annual or April–March schedules and fixed or quarterly assumed rates.

Pregnancy Weight Gain Calculator

Look up singleton-pregnancy total weight-gain reference ranges using pre-pregnancy BMI and calculate gain so far.

Pressure Converter

Convert signed pressure readings to a selected unit while preserving the gauge or absolute reference.

Prime Factorization Calculator

Find prime powers and divisor counts, with optional positive-divisor lists and matching factor pairs.

Print Bleed Calculator

Plan trim, bleed and safe boundaries using custom sizes or common print presets.

Print Size Calculator

Convert image pixels to print size or calculate the pixels required for a chosen print.

Probability Calculator

Calculate single-event, binomial and two-event probabilities with complements and working.

Profit Margin Calculator

Calculate margin and markup, or find a selling price or maximum cost for a target margin.

Prorated Rent Calculator

Calculate rent for inclusive charged dates within one month or across months, with per-month actual-day or fixed-30 division.

Pythagorean Theorem Calculator

Find a missing right-triangle side and calculate its area, perimeter, and acute angles.

Quadratic Equation Calculator

Solve quadratic coefficients or plain equations with rearranged coefficients, discriminant classification and numerical roots.

Quick Ratio Calculator

Calculate quick ratio from liquid-asset components or current assets minus non-quick exclusions.

Rafter Length Calculator

Calculate a common rafter’s geometric slope length from horizontal run, overhang, and roof pitch.

Rainwater Harvesting Calculator

Estimate event capture or rainfall needed to fill a tank, with retained metric/US entry, overflow and planned after-event water use.

Raised Bed Soil Calculator

Plan rectangular, circular or known-volume bed fill, with retained depth units, soil/compost bag labels, surplus and whole-bag cost.

Ratio Calculator

Simplify whole-number or decimal ratios into exact integer parts and divide a total into two proportional shares.

RC Time Constant Calculator

Calculate RC voltage after a time or time to a transition target, with selectable units and nonzero voltage endpoints.

Rebar Calculator

Estimate a rectangular reinforcement grid, convert measurements, and compare aggregate stock length with a feasible straight-cut plan and material cost.

Recurring Deposit Calculator

Estimate recurring-deposit maturity or the monthly installment needed for a target, using a term in years or months.

Regular Polygon Calculator

Find regular-polygon geometry from side count and a side, area, perimeter, apothem or radius.

Remaining Loan Balance Calculator

Find scheduled principal outstanding and future installments using payment counts or completed repayment years and months.

Reorder Point Calculator

Find a reorder trigger from daily or weekly demand and a unit or coverage-day buffer; compare inventory position.

Retirement Corpus Calculator

Estimate a retirement fund from monthly or annual expenses and an optional ending reserve.

Reverse Percentage Calculator

Recover the original amount before one or two known percentage changes, with intermediate and combined results.

ROAS Calculator

Calculate revenue ROAS, ACoS and target amounts, with optional contribution-margin break-even context.

ROI Calculator

Calculate total-cost ROI and profit, with an optional annualized start/end equivalent for an entered holding period.

Roof Area Calculator

Estimate sloped roof area from building dimensions or a known horizontal footprint, convert pitch formats and units, and optionally calculate whole material packages.

Roof Pitch Calculator

Find pitch from rise and run, or use a known pitch to find either measurement. Convert length units and slope formats while retaining the entered geometry.

Root Calculator

Find square, cube or custom-degree real roots and optionally show real solutions of the corresponding power equation.

Root Mean Square Calculator

Calculate equal or weighted RMS and arithmetic mean from signed samples, with squared-contribution evidence.

Safety Stock Calculator

Estimate safety stock from a known spread, daily demand observations or maximum and average demand/lead-time values.

Salary to Hourly Calculator

Convert annual, monthly, weekly, two-week, twice-monthly or hourly gross pay for your paid schedule.

Sample Size Calculator

Plan a sample size or estimate the margin attainable with an available sample.

Sand Calculator

Estimate sand from area, rectangle or known volume, with retained metric/imperial entries, order allowance, bag surplus and bulk quote costs.

Savings Calculator

Project savings with monthly deposits, a year or month term, nominal interest or APY, and a first goal-month estimate.

Savings Goal Calculator

Find the monthly contribution for a deadline or estimate how many months your current saving budget needs to reach a goal.

Savings Rate Calculator

Compare income and savings paid on different schedules, choose whether to include retirement, and measure the gap to a target rate.

Scientific Notation Calculator

Convert coefficient/exponent or pasted decimal and scientific forms into scientific, engineering, E and decimal notation.

Seed Starting Calculator

Plan sowing and hardening dates from frost or a chosen transplant date, with retained week/day intervals and a successive-sowing schedule.

Sell-Through Rate Calculator

Measure sell-through from stock balances, a known supply or sold-plus-remaining units, with an optional target rate.

Selling Price Calculator

Find a fee-aware cent price for a target margin or per-unit profit, and check a chosen listed price.

Series Resistor Calculator

Add or paste series resistors and calculate equivalent resistance, individual loading and source voltage or current.

Simple Interest Calculator

Solve simple interest, principal, annual rate or time using years, months, days or calendar dates with an explicit day divisor.

SIP Calculator

Project monthly SIP growth or find contributions needed for an investment goal.

Slope Calculator

Find a line from two points or signed rise and run, with equation, inclination, percentage slope and distance.

Sod Calculator

Plan sod from known area or rectangle dimensions, with retained lawn/piece units and individual, pallet or combined purchase quantities and costs.

Solar Energy Calculator

Estimate solar generation from array capacity or panel count, with entered self-use energy and separate import/export prices.

Solar Payback Calculator

Compare constant solar payback with yearly generation, tariff, upkeep and replacement assumptions in an undiscounted cash-flow table.

Solar System Size Calculator

Size solar capacity and whole panels from daily or billing-period electricity use, with an optional entered panel-area comparison.

Speed Converter

Convert decimal speeds or minute-and-second pace into speed units and reciprocal pace equivalents.

Square Footage Calculator

Measure rectangles, circles or triangles, or add different rooms in editable rows. Apply one allowance, convert area units and estimate material cost.

Stair Stringer Calculator

Plan equal risers from a finished rise and chosen limit or count. Enter going per tread, or calculate it from a known total floor run, with converted inch/mm measurements.

Standard Deviation Calculator

Calculate sample or population spread from a number list or value frequencies.

Standard Error Calculator

Calculate standard error from a sample or summaries and plan a target standard error.

Step-Up SIP Calculator

Compare fixed SIPs with percentage or fixed-amount annual increases and an optional monthly cap.

Steps to Distance Calculator

Estimate walking distance from step count and a measured average length per step.

Stud Calculator

Count studs for one wall or several wall rows, reconcile omitted members and framing extras, and apply one final purchase allowance with material cost.

Sukanya Samriddhi Calculator

Compare annual, monthly or entered SSY deposit schedules with monthly eligibility and fixed or quarterly-rate scenarios over 21 modeled years.

Surface Area Calculator

Measure solid surface area with selected bases and cone height or slant-height entry.

SWP Calculator

Model fixed or annually increasing monthly withdrawals, fund depletion and unpaid planned payouts.

System of Equations Calculator

Solve two linear equations from coefficient fields or plain x/y text and inspect unique-solution substitution.

T Statistic Calculator

Calculate a one-sample t statistic and p-value from summaries or raw sample observations.

Takt Time Calculator

Find demand-based takt from net time or shift duration, with an optional measured-cycle comparison.

Tank Volume Calculator

Enter internal dimensions for a rectangular or flat-ended cylindrical tank. Measure depth or height percentage, or enter a known volume to find its depth.

Target Heart Rate Calculator

Calculate age-estimated maximum heart rate and percentage-based exercise heart-rate ranges.

Tax Equivalent Yield Calculator

Compare a tax-exempt yield with a taxable yield after applying an entered marginal income tax rate to the taxable interest.

Temperature Converter

Convert Celsius, Fahrenheit, Kelvin and Rankine readings or signed temperature changes.

Tile Calculator

Estimate tile boxes from known area, one rectangle or editable surface rows. Convert measurements, apply an allowance and use tile counts or supplier box coverage.

Time Addition Calculator

Add several elapsed durations, or add or subtract a duration from a clock time.

Time Card Calculator

Total a seven-day timesheet with unpaid breaks, overnight shifts, and an optional gross-pay estimate.

Time Duration Calculator

Find time between clock readings or dated endpoints and subtract an optional break.

Time Lapse Calculator

Plan time-lapse playback, capture duration or start interval from a target clip length.

Tip Calculator

Choose a tipping base, enter tax as an amount or rate, account for a service charge and split a rounded total without losing cents.

TNEA Cutoff Calculator

Rescale subject marks and calculate their Mathematics, Physics and Chemistry contributions to a total out of 200.

Triangle Calculator

Solve a triangle from three sides, two sides and their angle, or two angles and side c.

Unit Price Calculator

Compare two offers, including multipacks, on a matching weight, volume or item-price basis.

Vector Dot Product Calculator

Enter vector lists or individual 2D/3D components to find dot product, angle and projection of A onto B.

Video File Size Calculator

Estimate video storage or solve the video bitrate that fits a per-recording size budget.

Voltage Divider Calculator

Calculate loaded divider voltage or solve either resistor for a target, with retained units and fixed-load tolerance bounds.

Volume Calculator

Calculate solid volume or solve a height or radius from a known volume with unit conversion.

Volume Converter

Convert known volume or rectangular box dimensions into cubic units, litres and explicitly named gallons.

Waist-to-Height Ratio Calculator

Calculate waist circumference relative to height using measurements in the same unit.

Waist-to-Hip Ratio Calculator

Calculate the ratio between waist and hip circumferences measured with a consistent protocol.

Wallpaper Calculator

Count full-height wallpaper drops for one width, a rectangular room or separate wall widths. Include straight-match repeat, trim, roll starting loss and spare rolls.

Weight Converter

Convert decimal mass, pounds and ounces, or stones and pounds between metric and avoirdupois units.

Weight Loss Percentage Calculator

Calculate signed weight loss from starting and current weight, with a comparison goal entered as percentage or weight.

Weighted Average Calculator

Calculate a weighted mean and solve the next value needed to reach a target average.

Weighted GPA Calculator

Compare weighted, unweighted and cumulative GPA using course credits and configurable bonus rules.

Wire Resistance Calculator

Estimate copper or aluminum DC wire resistance with retained length, area and temperature units plus optional source-voltage loss comparison.

Working Capital Calculator

Calculate net working capital from totals or components, with optional revenue scaling and previous-date comparison.

Z-Score Calculator

Convert an observation, z-score, or normal percentile into matching scores and tail areas.