Everyday utility

Right Triangle Calculator

Solve a right triangle completely — find all sides and angles when given two known values. Use this Data and utilities tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
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Result
Explanation
Common questions
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How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

A right triangle has one 90° angle. Given two sides, use the Pythagorean theorem for the third, and trig functions for angles. SOH-CAH-TOA: sin=opposite/hypotenuse, cos=adjacent/hypotenuse, tan=opposite/adjacent.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is SOH-CAH-TOA?

A mnemonic for trig ratios: Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent. Used to find missing sides and angles in right triangles.