Geometry Calculators

Plane Geometry • Solid Geometry • Trigonometry

Plane Geometry

2D shapes, areas, perimeters, distances, triangles and polygons

Circle Calculator

Calculate area, circumference and diameter from radius.

Radius

Area = πr²
Circumference = 2πr

Annulus Calculator

Calculate area and circumference of an annulus.

Outer Radius R Inner Radius r

Rectangle Calculator

Calculate area, perimeter and diagonal.

Length Width

Square Calculator

Calculate area, perimeter and diagonal.

Side

Parallelogram Calculator

Calculate area and perimeter.

Base Side Height

Triangle Calculator

Calculate area and perimeter from three sides.

Side a Side b Side c

Equilateral Triangle

Calculate area, perimeter and altitude.

Side

Isosceles Triangle

Calculate area, perimeter and height.

Equal Side a Base b

Right Triangle Calculator

Calculate hypotenuse and area.

Leg a Leg b

Pythagorean Theorem

Find the hypotenuse using a² + b² = c².

Side a Side b

Trapezoid Calculator

Calculate area and perimeter of a trapezoid.

Base a Base b Side c Side d Height

Rhombus Calculator

Calculate area and perimeter using diagonals.

Diagonal d₁ Diagonal d₂

Regular Polygon Calculator

Calculate perimeter and area of a regular polygon.

Number of Sides Side Length

Stadium Calculator

A stadium consists of a rectangle and two semicircles.

Rectangle Length Radius

2D Distance Calculator

Calculate distance between two points.

x₁ y₁ x₂ y₂

Slope Calculator

Calculate slope between two points.

x₁ y₁ x₂ y₂

Solid Geometry

3D shapes, volume, surface area and spatial distances

Cube Calculator

Calculate volume, surface area and space diagonal.

Side

Rectangular Prism

Calculate volume, surface area and diagonal.

Length Width Height

Sphere Calculator

Calculate volume, surface area and circumference.

Radius

Hemisphere Calculator

Calculate volume and surface areas.

Radius

Cylinder Calculator

Calculate volume and surface area.

Radius Height

Cone Calculator

Calculate volume, slant height and surface area.

Radius Height

Conical Frustum

Calculate volume and surface area of a conical frustum.

Large Radius R Small Radius r Height h

Capsule Calculator

Calculate capsule volume and surface area.

Radius Cylinder Length

Square Pyramid

Calculate volume and surface area of a square pyramid.

Base Side Height

Triangular Prism

Calculate volume from triangle base and prism length.

Triangle Base Triangle Height Prism Length

Tube Calculator

Calculate volume of a hollow cylindrical tube.

Outer Radius Inner Radius Length

3D Distance Calculator

Calculate distance between two points in 3D space.

x₁ y₁ z₁ x₂ y₂ z₂

Trigonometry

Trig functions, inverse functions, ratios and triangle laws

Trigonometric Functions

Calculate sin, cos, tan, sec, csc and cot.

Angle

Inverse Trigonometric Functions

Calculate arcsin, arccos and arctan.

Value

Trig Ratios

Calculate sine, cosine and tangent from opposite, adjacent and hypotenuse.

Opposite Adjacent Hypotenuse

Law of Cosines

Find side c using a² + b² − 2ab cos(C).

Side a Side b Angle C (degrees)

Law of Sines

Find side a from A, b and B.

Side b Angle A Angle B

Triangle Angle Sum

Find the third angle of a triangle.

Angle A Angle B

Degrees to Radians

Convert degrees into radians.

Degrees

Radians to Degrees

Convert radians into degrees.

Radians

© 2026 Geometry Calculators

Plane Geometry • Solid Geometry • Trigonometry