Shapes & everyday tools

Turn measurements and everyday numbers into something useful.

Choose a shape and find how much flat space it covers.

Find the area and perimeter from two perpendicular sides.

Start with a radius or diameter to find area and circumference.

Use a base and its perpendicular height to measure a triangle.

Find the space inside a cube, cylinder or sphere.

Switch between finding an amount, a percentage share or a change.

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A result is only the beginning.

Every calculator includes its formula, assumptions and worked steps. Start with the example, then try your own numbers.