General

Area Calculator

Use this area calculator to find the area of common shapes, convert between square feet, square metres, acres, and hectares.

Distance Calculator

Calculate distance between two points in 2D or 3D space with Euclidean distance, midpoint, squared distance, unit direction vector, slope, angle.

Ellipse Calculator

Calculate ellipse area, approximate perimeter, eccentricity, foci, vertices, shifted standard-form equation, diameter, aspect-ratio.

Endpoint Calculator

Use the endpoint calculator to find the missing endpoint from one endpoint and the midpoint, with formula steps, 2D/3D support, a 2D coordinate preview.

Hexagon Calculator

Solve a regular hexagon from side length, area, perimeter, across flats, across points, apothem, radius, or triangle area, with fit and scale comparisons.

Midpoint Calculator

Find the midpoint between two coordinate points in 2D or 3D space with distance, half-distance, selectable decimal precision, step-by-step formula substitution.

Octagon Calculator

Solve a regular octagon from side length, area, perimeter, apothem, circumradius, diagonals, or bounding square width with area, perimeter, radius, fit.

Parallelogram Area Calculator

Calculate the area, perimeter, diagonals, and angles of a parallelogram from base, height, side, and angle.

Pentagon Calculator

Calculate area, perimeter, diagonal, inradius, and circumradius of a regular pentagon from side length.

Perimeter Calculator

Calculate perimeter for squares, rectangles, triangles, circles, parallelograms, and trapezoids.

Polygon Calculator

Calculate regular polygon area, perimeter, angles, diagonals, apothem, and circumradius from side length, perimeter, area, apothem, or radius.

Rectangle Calculator

Use this rectangle calculator to find area, perimeter, diagonal, and missing side lengths from width + height, area + width, perimeter + width.

Rhombus Calculator

Use this rhombus calculator to find area, perimeter, diagonals, height, and angles from side and angle, side and height, side and area, or both diagonals.

Surface Area Calculator

Calculate total and lateral surface area for cubes, prisms, hemispheres, cylinders, cones, spheres.

Trapezoid Area Calculator

Calculate trapezoid area, perimeter, and median, then verify whether the stated bases, height, and legs form a valid trapezoid.