Free online calculators and tools
302 tools: calculators, unit converters, text tools and developer tools. Search by name or pick a category.
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BMI Calculator
Calculate adult body mass index in metric or US customary units.
Open calculatorJSON Compare
Compare JSON structures live, swap documents and choose a report limit while retaining complete difference counts.
Open toolPercentage Calculator
Find percentages, percentage change, a whole amount, or a value after adding or subtracting a percentage.
Open calculatorBusiness 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.
Open calculatorLine Break Remover
Join wrapped lines with a chosen separator, optional paragraph preservation and hyphen repair.
Open toolReading Time Estimator
Estimate reading time from a chosen pace, or the pace required to fit a time limit.
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Percentage Calculator
Find percentages, percentage change, a whole amount, or a value after adding or subtracting a percentage.
Open calculatorAge Calculator
Find calendar age, elapsed days and months, and the next birthday’s date and weekday.
Open calculatorCompound Interest Calculator
Project compound growth over years and months with monthly deposits and optional rate comparisons.
Open calculatorSIP Calculator
Project monthly SIP growth or find contributions needed for an investment goal.
Open calculatorLoan Calculator
Compare fixed monthly loan payments, flexible monthly terms and extra-payment savings.
Open calculatorBMI Calculator
Calculate adult body mass index in metric or US customary units.
Open calculatorWord Counter
Count text as you edit and compare word and visible-character totals with optional limits.
Open toolJSON Formatter
Format JSON live with spaces, tabs or compact output, optional object-key sorting and JSON downloads.
Open toolColor Converter
Preview an opaque color and copy HEX, RGB or HSL with a color picker and selected output formats.
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