Pythagorean theorem
For every right triangle, a² + b² = c², where c is the hypotenuse. Once the hypotenuse is known, area, perimeter, and angles follow directly.
MathCalculator
Right Triangle Calculator
Use the Pythagorean theorem to calculate hypotenuse, area, perimeter, and acute angles from two legs.
What it means
About this calculator.
Real-world layout checks
The same math is used for diagonal measurements, ramps, screens, roof pitches, and checking whether a corner is square.
FAQ
Questions people usually have.
Do the units matter?
No. If you enter inches, the side outputs are inches and area is square inches. If you enter meters, outputs follow meters.
Why do the angles add to 90?
A right triangle already has one 90-degree angle, so the two acute angles always add to the remaining 90 degrees.
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