Creators
Rojony Khatun Author
Rojony Khatun
CalculatorToolsProjectExpert
Reviewers
Małgorzata Koperska, MD Steven Wooding
Last updated: November 14, 2025

Pythagorean Theorem Calculator | Solve Hypotenuse & Sides

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Pythagorean Theorem

Pythagorean Theorem

Calculate the hypotenuse or missing sides of a right triangle using the Pythagorean Theorem. Fast, accurate, and online for students, engineers, and designers.

geometry right triangle calculator

Pythagorean Theorem Calculator assists users to easily find the hypotenuse or the missing side of a right triangle. It computes the third side immediately, having entered two sides known, and is useful in math and engineering, engineering and design work, and also in design work.

hypotenuse calculator online

The Pythagorean Theorem Calculator is an online tool that calculates the hypotenuse or missing side of a right triangle. By entering any two side lengths (a, b, or c), the calculator instantly computes the missing side using the formula:

\[ c=\sqrt{a^{2}+b^{2}} or a=\sqrt{c^{2}-b^{}2}, b=\sqrt{c^{2}-a^{2}} \]

This tool is ideal for students, engineers, architects, and designers who need precise triangle measurements for math problems, construction, or design tasks. The interface is simple, responsive, and requires no installation, providing instant results while reducing manual errors

Work, Installation, Input to Output

Work:

  • Accepts any two sides of a right triangle (a, b, or c).
  • Uses formulas:
  • \( c=\sqrt{a^{2}+b^{2}} \)
  • \( a=\sqrt{c^{2}-b^{}2} \)
  • \( b=\sqrt{c^{2}-a^{2}} \)
  • Displays the missing side instantly.

Installation:No installation required; works in any modern web browser.

Input:

  • Two sides of the triangle (a, b, or c)

Output:

  • Missing side (a, b, or c)

Testing and Final Adjustments

Test figures and numbers, decimals and big figures. Check manual computations based on the Pythagorean theorem formula. Treat unacceptable inputs with grace, e.g., negative values, infeasible sides of a triangle. Make sure that you are rounding off decimal findings properly. Mobile responsiveness and desktop responsiveness. Offer real-time updates whenever inputs are modified. Show the results in understandable units. Minimize UI to make it clear, fast, and easy to use. Add directions on how to enter two sides to find out the third side. Additionally, a visual presentation of a triangle may be included.

Frequently Asked Questions - Pythagorean Theorem:

What is a Pythagorean Theorem Calculator?

A tool to calculate the hypotenuse or missing side of a right triangle.

How do I use it?

Enter any two sides of a right triangle to calculate the third side.

Which formula is used?

c = √(a² + b²), a = √(c² - b²), b = √(c² - a²).

Is it free?

Yes, the Pythagorean Theorem Calculator is completely free online.

Can I use it on mobile devices?

Yes, it works on all devices and is fully responsive.

Does it provide instant results?

Yes, calculations are displayed instantly upon input.

Who can use this tool?

Students, engineers, architects, and designers.

Can it handle decimal values?

Yes, it supports decimals and precise inputs.

Does it work for non-right triangles?

No, it only works for right triangles.

Why is it useful?

It saves time, ensures accurate triangle measurements, and aids math and engineering tasks.

Rojony Khatun

Rojony Khatun

Calculator Tools Project

Rojony Khatun is the creator of a free online tools website designed to simplify everyday and engineering-related calculations for students, professionals, and hobbyists. The platform offers a wide variety of basic and advanced calculators across key categories, including Electrical Calculators, Electronic Calculators, and Time & Date Calculators, helping users solve problems quickly and accurately.