How it works
Find the hypotenuse of a right triangle from its perpendicular legs. Both legs must use the same length unit.
c = √(a²+b²)
Worked example
Show example inputs and result
First leg: 3 · Second leg: 4.
- Result
- 5
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy