Triangle Height Calculator

What this calculator does

A triangle height is an altitude from a vertex to the opposite side. Each triangle can have three altitudes.

Area and baseh = 2A / base.

Three sidesFind area first, then use h = 2A / side.

AltitudeA triangle has three possible heights.

For classroom work, check the required rounding rules and whether angles are in degrees or radians. This page uses degrees.

Use Pythagorean theorem or law of cosines depending on the triangle case.

Solve right-triangle side and angle questions with a formula explanation.

Find missing angles from sides or from two known angles.

Solve a triangle when all three sides are known.

Use two sides and the included angle.

Solve common oblique triangle cases.