Pythagorean Theorem Calculator
a² + b² = c² — solve for any side of a right triangle.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Pythagorean Theorem Calculator
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Enter any two of a, b (legs) or c (hypotenuse).
- 2
Step 2. Leave the side you want to solve for empty.
- 3
Step 3. The missing side is computed instantly with the formula shown.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about pythagorean theorem calculator.
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Area (Heron's), perimeter and angles from three sides.
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