Triangle Calculator
Find a triangle's area from base and height, or from three sides.
Result
Results are estimates for general information only and are not professional advice.
Triangle area
The area of a triangle is ½ × base × height. If you only know the three side lengths, this calculator uses Heron's formula instead. Choose your method and enter the values.
Frequently Asked Questions
What is the Triangle Calculator?
Find a triangle's area from base and height, or from three sides. It runs instantly in your browser and is completely free.
Is the Triangle Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Triangle Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.