Geometry Calculators
20+ free tools for trigonometry, conics, solids, and vectors. Precise solutions for every shape.
Trigonometry
sin
Law of Sines
Solve missing sides/angles in non-right triangles.
Calculate
cos
Law of Cosines
Find 3rd side or angle given SAS or SSS.
Calculate
△
Pythagorean Theorem
Calculate hypotenuse or leg length.
Calculate
Area
Heron's Formula
Triangle area from three side lengths.
Calculate
θ'
Reference Angle
Find positive acute angle to x-axis.
Calculate
360°
Coterminal Angle
Find angles sharing the terminal side.
Calculate
⏢
Trapezoid Area
Calculate area given bases and height.
Calculate
Conics & Coordinate
⬭
Ellipse Calculator
Area, perimeter and eccentricity solver.
Calculate
)(
Hyperbola Calculator
Vertices, foci, and asymptotes finder.
Calculate
∪
Parabola Calculator
Find vertex, focus, and directrix.
Calculate
h,k
Vertex Form
Convert quadratic to vertex form.
Calculate
y-y₁
Point Slope Form
Line equation from point and slope.
Calculate
G
Centroid Calculator
Find triangle center of mass.
Calculate
H
Orthocenter Calculator
Find intersection of triangle altitudes.
Calculate
k·P
Dilation Calculator
Geometric scaling transformations.
Calculate
↻
Rotation Calculator
Rotate coordinates around a point.
Calculate
Solid & Vectors
⬤
Sphere Calculator
Volume and surface area from radius.
Calculate
▽
Cone Calculator
Volume, lateral and total surface area.
Calculate
a×b
Cross Product
Perpendicular vector from two 3D vectors.
Calculate
û
Unit Vector Calculator
Normalize vectors to magnitude of 1.
Calculate
∫ds
Arc Length
Length of curve segment or arc.
Calculate
👗
Circle Skirt
Waist radius for DIY skirt projects.
Calculate