Pythagorean Theorem Calculator | Find the Hypotenuse Instantly

Hypotenuse (Side C)
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Solve for the Missing Side: Pythagorean Theorem Calculator

The Pythagorean Theorem is one of the most famous and useful formulas in mathematics. It establishes the relationship between the three sides of a right-angled triangle. Whether you are a student working on geometry homework or a carpenter checking if a corner is perfectly square, our Free Pythagorean Theorem Calculator makes the math effortless.

How It Works: The Formula

The theorem states that in a right-angled triangle, the square of the hypotenuse (the longest side, opposite the right angle) is equal to the sum of the squares of the other two sides:

a2+b2=c2a^2 + b^2 = c^2

To find the length of the hypotenuse (c), our calculator performs the following operation:

c=a2+b2c = \sqrt{a^2 + b^2}

Why Use Our Calculator?

  • Instant Results: Simply enter the lengths of the two legs (Sides A and B), and the hypotenuse is calculated in real-time.
  • Precision and Accuracy: We calculate down to the smallest decimal and then apply "smart rounding" for a clean, professional look.
  • Versatile Use: Ideal for school assignments, architecture, engineering, and navigation.
  • No Costs or Sign-ups: This is a 100% free tool with unlimited usage.