Hypotenuse Calculator
Pythagorean c side.
Enter the values and press Calculate.
How to use Hypotenuse Calculator
In a right triangle the hypotenuse squared equals the sum of the legs squared.
Open Hypotenuse Calculator on toolpermarket and enter your values above.
Enter the two legs a and b in the fields above, then press Calculate.
Read the result below the form. You can change any input and press Calculate again to compare scenarios.
Worked example. Legs of 3 and 4 give a hypotenuse of 5.
When to use Hypotenuse Calculator. Use it in construction, trigonometry, and geometry.
Practical note. The calculator works for any right triangle — the two legs may be in any unit as long as both use the same one, and a pair of 3 and 4 will always give 5.
When you actually reach for this
- Use it in construction, trigonometry, and geometry.
Where this tool stops being accurate
- Uses the units you enter consistently (all meters or all cm); mixing them silently breaks the result.
- It models ideal shapes, not real-world tolerances or material waste.
Frequently asked questions
Does it require a right triangle?
Yes. The Pythagorean theorem applies only to right triangles.
Can sides be zero?
A zero side is allowed and gives the other leg as the hypotenuse, but negatives are rejected.
Why is my area wrong?
Usually mixed units - if one side is in cm and another in m, convert first. The formula is exact once units match.