Pythagorean Theorem Calculator
The Pythagorean theorem solves c = √(a²+b²) for the hypotenuse from two legs — ladders, ramps, screen diagonals. A 3-4-5 triangle reads c = 5.00 on site — free, runs locally.
How to Use the Pythagorean Theorem Calculator
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Frequently Asked Questions
How do I check a corner is square?
Measure 3 units along one wall, 4 along the other: a square corner spans exactly 5 between marks. Enter the two legs here to get the hypotenuse before cutting material.
Can it solve for a leg, not the hypotenuse?
No — both inputs are legs and only the hypotenuse is solved. Rearrange c²−a² under a root by hand when a leg is the unknown.
Does it verify right triangles?
No three-side check — the tool takes two legs and returns the hypotenuse. Confirm angles with a known triple instead.
Is my input uploaded?
No — solving runs locally in your browser. Numbers never leave your device.
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Last updated October 2026