FREE ONLINE CALCULATOR / GEOMETRY
Heron’s Formula Calculator
Find triangle area from three side lengths. Fast, private, and built to make every number easier.
Input values
✦ InteractiveHow does this calculator work?
Find triangle area from three side lengths. Edit the inputs and see the computed results. All calculations take place inside your browser, without submitting values to a server.
A = √(s(s−a)(s−b)(s−c)), s=(a+b+c)/2
Note: The triangle inequality must hold.
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