This Pythagorean theorem calculator focuses on right-triangle side relationships. It finds hypotenuse c from legs a and b, finds one leg from the hypotenuse and the other leg, or checks whether three entered sides satisfy a² + b² = c².
It answers “what is the missing side?” or “does this side set fit a right triangle?” It is not a full triangle solver: it does not calculate angles, area, perimeter, map distance, or unit conversions.
For non-right triangles or problems that also need angles, area, or perimeter, use the triangle calculator.
The page has four modes: Find Hypotenuse c, Find Leg a, Find Leg b, and Verify Right Triangle. The field that is being solved for becomes read-only; verify mode requires all three sides.
It can find hypotenuse c, find leg a, find leg b, or verify whether three sides satisfy the Pythagorean relationship.
In Find Hypotenuse c mode, enter the two perpendicular legs a and b; c is returned as the result.
c is the hypotenuse and must be the longest side of a right triangle; otherwise the square root does not produce a valid positive leg.
It is `|a²+b²-c²|`. The page says yes when the difference is below `0.000001`; this is a numeric tolerance, not a field-measurement tolerance standard.
Yes. The page does not convert centimeters, meters, or inches, so all three sides must use the same unit system.
Find a hypotenuse from two legs, solve a missing leg, or verify three side lengths with the Pythagorean relationship.