Enter dimensions
Fill in any two sides and leave the third empty.
Results
Enter your dimensions above and the results appear here.
About the Pythagorean Theorem Solver
The pythagorean theorem solver is a free online tool: find the missing side of a right triangle. Enter leg a, leg b and hypotenuse c and the results update instantly, alongside a labelled diagram so you always know which measurement goes where.
It runs entirely in your browser, so nothing you type is uploaded or stored. Use the share button to copy a link that restores your exact inputs.
Pythagorean Theorem Solver example
Leg a = 3 cm
Leg b = 4 cmHypotenuse c = 5 cm
Area = 6 cm²
Perimeter = 12 cm
Angle A = 36.8699 °
Angle B = 53.1301 °
Altitude to hypotenuse = 2.4 cmHow to use the Pythagorean Theorem Solver
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter leg a, leg b and hypotenuse c. Focus a field to highlight the matching label on the diagram.
- Read the results as you type. The largest card is the main answer; the others are the related measurements.
- Copy a single value, copy everything, or share a link that keeps your inputs.
Pythagorean Theorem Solver FAQ
What formulas does the pythagorean theorem solver use?
a² + b² = c²; c = √(a² + b²); a = √(c² − b²).
Does it work for any triangle?
No. a² + b² = c² only holds for right triangles. For other triangles use the Triangle Solver.
Can I use different units?
Yes. Pick the input unit and, if you like, a different output unit. Area results are shown in squared units and volumes in cubed units.
Is this pythagorean theorem solver free and private?
Yes. It is free with no sign-up, and calculations happen on your device, so your numbers are never sent to a server.
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