Geometry Calculators
Enter the measurements you know to find the rest: radius, side lengths, angles, area, volume or surface area. You’ll find the formula and a worked example on every tool page.
Browse calculators
11 tools3D Distance Calculator
Find 3D point distance, midpoint and direction using coordinates or pasted triples.
Open calculatorArea Calculator
Calculate areas of rectangles, triangles, circles, ellipses, parallelograms, and trapezoids.
Open calculatorCircle Calculator
Calculate a circle’s radius, diameter, circumference, and area from one known measurement.
Open calculatorCircular Segment Calculator
Find a circular segment’s area, arc and perimeter from radius with angle, height or chord.
Open calculatorEllipse Calculator
Find ellipse axes, foci and eccentricity from axes or a known eccentricity or focus distance.
Open calculatorLaw of Cosines Calculator
Find a missing triangle side from two sides and their angle, or find an angle from three sides.
Open calculatorPythagorean Theorem Calculator
Find a missing right-triangle side and calculate its area, perimeter, and acute angles.
Open calculatorRegular Polygon Calculator
Find regular-polygon geometry from side count and a side, area, perimeter, apothem or radius.
Open calculatorSurface Area Calculator
Measure solid surface area with selected bases and cone height or slant-height entry.
Open calculatorTriangle Calculator
Solve a triangle from three sides, two sides and their angle, or two angles and side c.
Open calculatorVolume Calculator
Calculate solid volume or solve a height or radius from a known volume with unit conversion.
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