Right Triangle Calculator
Solve a right triangle — give any two sides and get the third side, area and perimeter.
Right triangle
By Pythagoras, a² + b² = c². Leave one side blank to solve for it. For Heron's formula: s = (a+b+c)/2; area = √(s·(s−a)·(s−b)·(s−c)).
Frequently Asked Questions
Is the Right Triangle Calculator free to use?
Yes, the Right Triangle Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.
Is my data safe when using the Right Triangle Calculator?
Absolutely. All calculations performed by the Right Triangle Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.
How accurate is the Right Triangle Calculator?
Our Right Triangle Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.
Can I use the Right Triangle Calculator on my mobile phone?
Yes! The Right Triangle Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.