Geometry Calc: Area & Volume

Area, perimeter, surface area and volume for 42 shapes, from squares and circles to frustums, tori and ellipsoids, plus a triangle solver for SSS, SAS, ASA, AAS, SSA (both answers in the ambiguous case) and right triangles.

Correct formulas, checked by more than 800 automated tests against known values and identities.
Labelled diagrams, every formula shown, and step-by-step working with your numbers (Pro).
Solve for any dimension, e.g. a cylinder's height from its volume and radius (Pro).
Feet-inch-fraction input (3′ 4-5/8″) and metric, with unit conversions.
Works offline. No account, no ads, no tracking.