Math & Science
Triangle Calculator
Calculate triangle area, perimeter, angles
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Triangle Calculator do?
It helps you calculate triangle area, perimeter, angles.
What inputs do I need?
Enter Base, Height, Side A, Side B, and Side C.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Triangle Calculator turns your inputs into practical results. Provide Height, Base, and Side A to calculate Area and Perimeter.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.