About the Pythagorean Theorem Calculator
A right-triangle side calculator with a live diagram, in your browser.
What it is
The Pythagorean Theorem Calculator solves aยฒ + bยฒ = cยฒ for whichever side of a right triangle is missing, given the other two. It draws a scaled diagram of the triangle and highlights the side being solved for, making it easy to see the geometry behind the math.
Features
Solve any side
Enter any two sides โ both legs, or a leg and the hypotenuse.
Live diagram
A scaled right-triangle diagram updates as you type, with the solved side highlighted.
Area included
See the triangle's area alongside the three side lengths.
Step-by-step working
See the exact formula and substitution used to reach the result.