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Geometry calculators

Measure shapes and solve triangles: area, volume, surface area, circles, slope, distance and the Pythagorean theorem, with unit conversions.

Triangle and Right Triangle both solve a triangle from partial information, but Right Triangle is specifically for the right-angle case (sides and trig ratios), while Triangle handles the general SSS/SAS/ASA/SSA cases including the ambiguous two-solution one. Pythagorean Theorem is the simplest right-triangle case — just the three sides.

Area and Volume cover flat shapes and solids respectively, each with a dozen-plus shape presets; Surface Area is the outside-covering counterpart to Volume for the same solids. Circle, Slope and Distance are coordinate-geometry tools: a circle's own measurements, the slope and equation of a line through two points, and the straight-line distance between two points.

Triangle CalculatorSolve any triangle from three known valuesVolume CalculatorVolume of 14 solids, with litres and gallonsSlope CalculatorSlope, line equation and angle from two pointsArea CalculatorArea of 12 shapes in sq ft, sq m, gaj and acresDistance CalculatorDistance and midpoint between two points, 2-D or 3-DCircle CalculatorRadius, diameter, circumference and area from any oneSurface Area CalculatorSurface area of 14 solids, with volumePythagorean Theorem CalculatorFind the hypotenuse or a missing leg with a² + b² = c²Right Triangle CalculatorSolve a right triangle from any two values