Right Triangle Calculator
Calculate the missing sides, angles, area, and perimeter of a right triangle given any two inputs (legs, hypotenuse, or angle).
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator solves any right triangle given any two values (legs, hypotenuse, or one acute angle).
- Enter exactly two values into the input fields. For example:
- Two legs (a and b)
- One leg and the hypotenuse (c)
- One leg and an acute angle (A)
- The hypotenuse and an acute angle
- Leave all other fields blank. The calculator will automatically compute the missing sides and angles.
- Click "Calculate" or press Enter on your keyboard.
- View the results below the button. You’ll see:
- Both legs (a and b)
- Hypotenuse (c)
- Both acute angles (A and B in degrees)
- Area and perimeter
Important notes:
- All values must be positive numbers. Angles must be between 0° and 90°.
- The calculator uses the Pythagorean theorem and trigonometric ratios.
- No units are required—use any consistent measurement (e.g., all in meters or all in feet).
Previous Results
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Frequently Asked Questions
It uses the Pythagorean theorem and trigonometric ratios to calculate the missing sides and angles. Enter any two known values (legs, hypotenuse, or one acute angle) and the calculator will compute the rest.
The calculator validates that exactly two positive values are entered. If not, it shows error messages. For a right triangle, the hypotenuse must be longer than each leg, and angles must be between 0 and 90 degrees.
No, this calculator is specifically designed for right triangles (one angle = 90°). For other triangles, you would need a different tool.
