Triangle Area Calculator
Calculate triangle area from base and height, three sides (Heron's formula), or SAS.
Formula
A = (1/2)×b×h
Area equals half base times height. The height must be perpendicular to the base.
Examples
b=6, h=4
b=10, h=7
b=8, h=5
Frequently Asked Questions
What is the basic triangle area formula?
A = (1/2) × base × height.
What if I only have three sides?
Use Heron's formula: A = √(s(s-a)(s-b)(s-c)) where s = (a+b+c)/2.
What is the SAS area formula?
A = (1/2) × a × b × sin(C), where C is the included angle.
About this Calculator
Calculate triangle area from base and height, three sides (Heron's formula), or SAS. All calculations are performed in your browser for instant results. Formulas are mathematically exact using JavaScript's built-in Math functions.