Geometry Calculators

Plane Geometry Calculators


Angle Conversion

Angles In Circles   Tutorial for calculating angles in circles (central angles, inscribed angles, etc.) formed from radii, chords, tangents and secants.

Central Angle Calculator   Calculates a Circle's Central Angle, Radius or Arc Length

Circle Circumference & Area Calculator

CIRCLE Calculator   for Radius, Central Angle, Chord, Segment Height, Apothem, Arc Length and Chord Length. If you know two, it will calculate the other five as well as the Sector Area, Segment Area and Circle Area.

ARC to CHORD RATIOS   a listing from 1° to 180°

Circle Equation Tutorial
Explains equations of the type x² + y² = r²

Circle Equation Calculator
Input 3 points and it calculates a circle's center radius and equation.

Ellipses   Calculator and tutorial


Types of Triangles   A chart showing triangles classified by angles (acute, right, obtuse) and by sides (equilateral, isosceles, scalene).
Also has triangle area formulas and a triangle area calculator.

Triangle Centers   A tutorial discussing the incenter, circumcenter, centroid, orthocenter and the Euler line.

Triangle Tester   Calculates if 3 sides will form a triangle or not.

Triangle Tester   Input 3 triangle side lengths and this calculates if the sides will form an equilateral, isosceles, acute, right or obtuse triangle.

Ultimate Triangle Calculator   Input 3 triangle sides, 2 sides with the included angle or 2 angles with the included side and this calculates all the other triangle information.

Side Side Angle Triangle Calculator   If you know 2 triangle sides and a non-included angle, this calculates the other side and the other 2 angles.

Right Triangles (Pythagorean Theorem)

30 60 90 and 45 45 90 Triangle Calculator


Quadrilateral page   Descriptions and graphics discussing 6 different types of quadrilaterals.

Calculator for Squares and Rectangles

Rhombus Calculator   Input side length and either angle and it calculates the area, both diagonals, altitude, perimeter.
  Input both diagonals and it calculates the side, area, altitude, perimeter and both angles.

Calculator for Parallelograms   Input two parallelogram sides and one angle and it calculates the area, both diagonals, altitude, perimeter and the angle of intersection of the diagonals.
  Input both diagonals and diagonal intersection angle and it calculates area, both sides, altitude, height, perimeter and both angles.

Quadrilateral Kite Calculator

Trapezoid Calculator

Calculating Trapezoid Area - Tutorial


Regular Polygon Calculator   Input the number of sides and the side length and it calculates the polygon perimeter, all angles (interior, central and exterior), the inradius, the circumradius and the total area.

Calculator for Constructing Regular Polygons
Draw a circle, measure the radius and this calculates the length of the polygon's sides.

Polygons that have integer angles.
  A listing of the 22 Regular Polygons whose angles are integers.

Solid Geometry Calculators

Area and Volume Calculator for a Sphere or Cylinder

Spherical Tank

Spherical Cap

Cube Area and Volume

Triangular Prism Calculator - Input the 3 triangle sides, the height and it calculates the total area and volume.

Rectangular Solid (Rectangular Prism) - Calculates Area and Volume

Rectangular Tank   with Dipstick Calculator

Horizontal Cylindrical Tank   with Dipstick Calculator

Vertical Cylindrical Tank   with Dipstick Calculator

Torus Calculator - Calculates Volume and Area

The 5 Platonic Solids (Regular Polyhedra) Calculator - Information about the Tetrahedron, Hexahedron (Cube), Octahedron, Dodecahedron, Icosahedron and calculator.   Also explains Euler's Polyhedron Formula:   (V -E +F = 2)

Cones & Frustums

Right Regular Prisms

Right Regular Pyramids

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