Heron’s Formula Calculator — Area from 3 Sides
Use this free Heron’s formula calculator to find the area of a triangle from its three side lengths. It also reports the semi-perimeter, perimeter, a height, and the triangle type, with a scaled diagram.
Heron’s formula
With s = (a + b + c)/2, the area is √[ s(s − a)(s − b)(s − c) ]. The three sides must satisfy the triangle inequality.
Original price was: $109.99.$54.99Current price is: $54.99.
How to use it
- Enter the three side lengths.
- Press Find area.
Related: the Triangle Calculator and the Law of Sines & Cosines Calculator.
Frequently asked questions
When can three sides not form a triangle?
When one side is greater than or equal to the sum of the other two (the triangle inequality fails).
Original price was: $109.99.$54.99Current price is: $54.99.
Do I need the height?
No — Heron’s formula uses only the three sides. The calculator reports a height as a bonus.
Original price was: $109.99.$54.99Current price is: $54.99.
Does it show the triangle type?
Yes — acute/right/obtuse and scalene/isosceles/equilateral.
Original price was: $27.99.$17.99Current price is: $17.99.
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