Geometry Calculators

Calculate the area and perimeter of rectangles, triangles, circles, ellipses, trapezoids and sectors, with the formula shown for each shape.

Enter any one property of a circle — radius, diameter, circumference or area — and get the other three instantly.

Calculate the volume and surface area of boxes, cylinders, spheres, cones, pyramids, capsules, spherical caps, conical frustums, ellipsoids and tubes, also shown in litres and gallons.

Solve any triangle from three sides, two sides and an angle, or two angles and a side — with all sides, angles, area, perimeter and height.

Solve a right triangle from any two known parts using the Pythagorean theorem and trigonometry, with all sides, angles and trig ratios.

Find the straight-line distance between two points in 2D or 3D, or the great-circle distance between two latitude/longitude coordinates on Earth.

Find the slope between two points along with the line equation in every standard form, the angle, and the perpendicular slope.

Calculate the area, circumference, eccentricity and focal points of an ellipse from its two semi-axes.

Calculate the area, perimeter, interior and exterior angles, apothem and circumradius of any regular polygon.