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Geometry calculators

Geometry9

Geometry calculators for circle, triangle and polygon areas, solid volumes, the Pythagorean theorem and point distances.

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Enter a radius to get a circle’s area, circumference and diameter instantly, all from π-based formulas.

Get triangle area from base and height, or from all three sides via Heron’s formula; no height needed.

Solve right triangles: find the hypotenuse from two legs, or the missing leg from hypotenuse and one leg.

Compute a rectangle’s area, perimeter and corner-to-corner diagonal from length and width, with optional units.

Find trapezoid area from its two parallel bases and height using the averaged-base formula.

From one radius, get a sphere’s volume and total surface area using the classic 4⁄3πr³ and 4πr² formulas.

Compute cylinder volume from radius and height, with total surface area and base area alongside.

Get cone volume from radius and height, plus slant height and lateral surface area for material estimates.

Measure straight-line Euclidean distance between two points in 2D or 3D space via the Pythagorean-based formula.