Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle. Get its area and perimeter using the same length unit throughout.
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- Runs in your browser
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Result
Enter the required values to see your result. Use the example to try the complete calculation.
This applies only to right triangles. Lengths must be positive and in the same unit. The hypotenuse must be longer than the known leg.
How this calculation works
Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle. Get its area and perimeter using the same length unit throughout.
Units and limits
This applies only to right triangles. Lengths must be positive and in the same unit. The hypotenuse must be longer than the known leg.
Formulas
- Calculation
- c² = a² + b²; area = a × b / 2
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Discover VISU LinkHow to use it
- Choose the operation when available and enter your own values in the labelled fields.
- Check the units and the limits explained below before interpreting the answer.
- Read the result and its details. Copy it or download a result card; no account is required.
Examples
Worked example
Legs 3 and 4 give hypotenuse 5, area 6 and perimeter 12.
Another case
Hypotenuse 13 and known leg 5 give the other leg 12.
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Questions
What does this tool calculate?
Find the hypotenuse or a missing leg of a right triangle. Get its area and perimeter using the same length unit throughout.
Which inputs and units should I use?
This applies only to right triangles. Lengths must be positive and in the same unit. The hypotenuse must be longer than the known leg.
Can I check a worked example?
Legs 3 and 4 give hypotenuse 5, area 6 and perimeter 12.
Are my input values uploaded or stored?
No. The calculation runs in this browser. Typed values are not sent to analytics, placed in the page URL or saved by the calculator. Copying or downloading is an action you choose.
Do I need an account or a paid plan?
No. The calculation, example, result copy and result card are available without registration. VISU services are an optional next step.