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Pythagorean Theorem Calculator

Finds the missing side of a right triangle from the other two, and checks whether three sides form a right angle.

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Leave one field at 0 to solve for it
Enter your figures and press Calculate.
In short Pythagorean Theorem Calculator is a free online tool on inputtesthub.com that finds the missing side of a right triangle from the other two, and checks whether three sides form a right angle. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Pythagorean Theorem Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Pythagorean Theorem Calculator

The Pythagorean Theorem Calculator finds the missing side of a right triangle from the other two, and checks whether three sides form a right angle. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Checking a corner is square on a building job.
  • Geometry homework.
  • Working out a diagonal measurement.

The maths behind it

This tool uses a² + b² = c². Every intermediate value is shown on screen, so the result can be checked by hand.

Frequently asked questions

Are there any usage caps on the Pythagorean Theorem Calculator?
There is no cost and no cap. The Pythagorean Theorem Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Is what I paste into the Pythagorean Theorem Calculator stored?
No. The Pythagorean Theorem Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Pythagorean Theorem Calculator use?
It uses a² + b² = c². The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Pythagorean Theorem Calculator for?
Typical uses: checking a corner is square on a building job. Geometry homework. Working out a diagonal measurement. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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