Triangle Calculator

Find a triangle's area and perimeter from its base, height, and side lengths.

Your inputs

Enter your information and select Calculate to see the result.

Area is base times height divided by two; perimeter is the sum of the three sides.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

A 3-4-5 triangle has perimeter 12.

This calculator is for educational use; verify important work independently.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.