Learning focus 1
Use a and b for legs and c for the hypotenuse.
Free online calculator
Pythagorean Theorem Calculator
Enter any two side lengths of a right triangle to calculate the missing leg or hypotenuse.
Step-by-step solutions
Clear, detailed explanations
Instant results
Accurate answers in seconds
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How to Use the Pythagorean Theorem Calculator
1
Enter two known sides
Use a and b for legs and c for the hypotenuse.
2
Apply a² + b² = c²
The calculator rearranges the theorem for the missing side.
3
Calculate the length
The positive square root gives the geometric side length.
Example
What the Pythagorean Theorem Calculator Helps You Understand
Enter any two side lengths of a right triangle to calculate the missing leg or hypotenuse.
Learning focus 2
The calculator rearranges the theorem for the missing side.
Learning focus 3
The positive square root gives the geometric side length.
Input tips
- • Use a and b for legs and c for the hypotenuse.
- • c is the hypotenuse, the longest side opposite the right angle.
Common mistakes to avoid
- • Using the theorem for a triangle that is not right-angled.
- • Treating a leg as the hypotenuse when rearranging the formula.
Frequently Asked Questions
Which side is c?
c is the hypotenuse, the longest side opposite the right angle.
Can it solve for a leg?
Yes. Enter the other leg and the hypotenuse, for example a=5, c=13.