Pythagorean Theorem Calculator
Calculate missing sides of a right triangle and check for Pythagorean triples.
c = √(a² + b²)
Right Triangle
Result — Hypotenuse c
5
Leg a
3
Leg b
4
Hyp. c
5
Area
6
Perimeter
12
Angle A
36.86989765°
Angle B
53.13010235°
Angle C
90°
Pythagorean Triple: Yes! It's a Pythagorean triple.
Common Pythagorean Triples
3 – 4 – 5
5 – 12 – 13
8 – 15 – 17
7 – 24 – 25
20 – 21 – 29
9 – 40 – 41
6 – 8 – 10
10 – 24 – 26
Pythagorean TheoremRight TriangleHypotenuseGeometry
Calculate any side of a right triangle using the Pythagorean theorem (a² + b² = c²) and instantly check if the result forms a Pythagorean triple.
Key Features
Three Solve Modes
Find the hypotenuse c, or either leg a or b — just enter the other two sides.
Pythagorean Triple Checker
Automatically detects if all three sides are integers forming a Pythagorean triple, and identifies its base triple (e.g. 3-4-5).
SVG Right Triangle
Draws a proportional right-triangle diagram with labeled sides and right-angle marker.
Full Output
Shows all three sides, angles A and B, area, and perimeter.
Common Triples Reference
Quick reference table of the most common Pythagorean triples.
How to Use
- 1Choose what to find: hypotenuse c, leg a, or leg b.
- 2Enter the two known sides.
- 3The missing side and all derived measurements appear instantly.