Pythagorean Theorem Calculator
Solve for any side of a right triangle with a² + b² = c².
Hypotenuse (c)
5cm
Area
6cm²
Perimeter
12cm
Angle at A
36.87°
ShowHide the working
- 1c² = 3² + 4² = 25
- 2c = √25 = 5
Formula
a² + b² = c²How it works
Relates the three sides of a right-angled triangle. Give any two and the third follows.
Example
With legs of 3 and 4, the hypotenuse is 5.
About the Pythagorean Theorem Calculator
Solve for any side of a right triangle with a² + b² = c². It sits in the Geometry section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Pythagorean Theorem Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Pythagorean Theorem Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Pythagorean Theorem Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Geometry?
- Area, perimeter, volume and surface area for every common shape. You can browse the full Geometry category for related calculators.