Geometry Calculators
10 calculators
Classical plane and solid geometry: circles, triangles, cylinders, cones, pyramids and the Pythagorean relation. These are exact formulas on ideal shapes, so the answer is only as real as your measurements — a nominally circular planter that is slightly oval will not match its computed volume.
- Area of a Circle Calculator Calculate the area, circumference and diameter of a circle from its radius or diameter.
- Circumference Calculator — Radius, Diameter or Area Enter a circle’s radius, diameter, circumference or area in cm or cm². Calculate the other measurements, including circumference to diameter.
- Cone Volume Calculator Get the volume, slant height and surface areas of a right circular cone from its radius and height.
- Cylinder Volume Calculator Calculate the volume, surface area and lateral area of a cylinder.
- Pyramid Volume Calculator Find the volume, slant height, edge length and surface areas of a square-based pyramid.
- Pythagorean Theorem Calculator Find the missing side of a right triangle using the Pythagorean theorem.
- Sphere Volume Calculator Calculate the volume and surface area of a sphere from its radius or diameter.
- Trapezoid Calculator — Area and Diagonals Work out the area, midline and perimeter of a trapezoid from its two parallel sides, height and legs.
- Triangle Area Calculator Calculate a triangle’s area from its three side lengths using Heron’s formula.
- Triangle Calculator — Three Sides Enter three side lengths and get the area, all three angles, the perimeter and both radii.
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Geometry calculations start with a defined shape and enough compatible measurements. An area uses squared units, a volume uses cubed units, and a triangle solver needs one of its supported sets of known sides or angles. Choose the model before substituting dimensions.
Solve a plane shape from the known dimensions
Use a triangle solver for supported side-and-angle combinations, a circle tool for radius or diameter, and a trapezoid tool for compatible bases and height or legs. Impossible dimensions should be resolved rather than forced into a formula.
Calculate the volume of a stated solid
Cylinder, cone, sphere and pyramid tools assume the ideal shapes named on their pages. Match the requested height, radius or base measure and convert length units before comparing volume outputs.
Keep the shape assumptions explicit
An irregular object, a sloping surface or a hollow container may require a different model from the ideal shape. Check measurement precision and whether an output is exact or rounded before carrying it into a material estimate.