🔺
Triangle Calculator
Area, perimeter and angles from sides or base & height.
Enter your details
Given
Results
Area
—
Perimeter
—
How to use the Triangle Calculator
Two modes: base × height ÷ 2, or Heron's formula from three sides.
Frequently Asked Questions
Area = √(s(s−a)(s−b)(s−c)) where s is the semi-perimeter. It finds area from sides alone.