Math & science
Triangle calculator
Calculate area and perimeter from three sides.
Let’s run the numbers
USDEnter your values, then calculate.
◇ Calculated on your device. No account needed.
THE NUMBERS, MADE CLEARInstant calculation
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Your answer starts here
Check your inputs and select Calculate.
Calculated from your inputs; displayed results are rounded.
Formula & assumptions
A = √(s(s−a)(s−b)(s−c)), s = (a+b+c)/2
Calculated from your inputs; displayed results are rounded.