Geometry calculators

Geometry calculators for areas, volumes, angles, and shapes. Whether you need the area of a circle or the volume of a cone, the formula and a worked example are included.

10 calculators

• Circle Calculator

  Pick which property of the circle you know — radius, diameter, circumference or area — type the value, and the calculator returns the other three using exact π.

• Cone Volume Calculator

  Type the base radius and height of a right circular cone — the calculator returns volume, slant height, lateral and total surface area, all using exact π.

• Cylinder Volume Calculator

  Type the radius and height of a right circular cylinder — the calculator returns volume, base area, lateral (curved) surface and total surface, all using exact π.

• Hexagon Calculator

  Type the side length of a regular hexagon. The calculator returns the area, perimeter, apothem, long diagonal, width across the flats and circumradius — all from one input.

• Pythagorean Theorem Calculator

  Solve a² + b² = c² for any side of a right triangle, with area, perimeter and angles shown alongside.

• Slope Calculator

  Type the (x, y) coordinates of two points. The calculator returns the slope of the line through them plus the full line equation, midpoint, straight-line distance and the angle the line makes with the x-axis.

• Sphere Volume Calculator

  Type the radius of a sphere — the calculator returns volume, surface area, diameter, circumference and great-circle area, all using exact π.

• Surface Area Calculator

  Pick a solid — cube, sphere, cylinder, cone or square pyramid — enter its dimensions and get the total surface area, plus the lateral and base components, in any unit.

• Tank Volume Calculator

  Pick a tank shape — vertical cylinder, horizontal cylinder, or rectangular box — enter the dimensions and (optionally) a liquid depth. Get total volume, filled volume, head space and fill percent.

• Triangle Calculator

  Solve any triangle from three known measurements — sides, angles, area and perimeter, with the laws of sines and cosines doing the work behind the scenes.