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Pythagorean Theorem Calculator

c

Result

Hypotenuse (c)5
Triangle area6
Angle A (opposite leg a)36.8699°
Angle B (opposite leg b)53.1301°
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Pythagorean Theorem Calculator Popular Pythagorean Theorem Calculator is a mathematics calculator that helps you calculate pythagorean theorem values from your input data. The formula used is: a² + b² = c². Find hypotenuse: c = √(a² + b²). Find a leg: a = — free online calculator.

Formula

a² + b² = c². Find hypotenuse: c = √(a² + b²). Find a leg: a = √(c² − b²). Angles: sin(A) = a/c, sin(B) = b/c.
  • Pythagorean Theorem Calculator calculates its result from A, C, B. It uses the formula a² + b² = c². Find hypotenuse: c = √(a² + b²). Find a leg: a = √(c² − b²). Angles: sin(A) = a/c, sin(B) = b/c.. Change any input to recalculate the result instantly.
  • The main inputs are Find which side?, Leg a, Leg b, Hypotenuse. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Pythagorean Theorem

Inputs
  • Find which side?: hypotenuse
  • Leg a: 3
  • Leg b: 4
  • Hypotenuse: 5 c

Using A = 2, C = 3, B = 4, the calculated result is 1.3333333333.

Sample result: Calculating…

Frequently asked questions

What does the Pythagorean Theorem calculate?

Pythagorean Theorem Calculator Popular Pythagorean Theorem Calculator is a mathematics calculator that helps you calculate pythagorean theorem values from your input data. The formula used is: a² + b² = c². Find hypotenuse: c = √(a² + b²). Find a leg: a = — free online calculator.

Which values should I enter?

Enter Find which side?, Leg a, Leg b, Hypotenuse using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: a² + b² = c². Find hypotenuse: c = √(a² + b²). Find a leg: a = √(c² − b²). Angles: sin(A) = a/c, sin(B) = b/c..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 10, 2026