Right Triangle Calculator
Calculate the hypotenuse, area, and perimeter of a right triangle from its two legs.
Calculate
Enter your values below.
Result
Hypotenuse
0
Area
0
Perimeter
0
Formula used
c = √(a² + b²), Area = ½ab, Perimeter = a + b + c
Example: Legs 3 and 4 → hypotenuse 5, area 6, perimeter 12.
How to use this calculator
- Enter Leg a, Leg b.
- Press Calculate to see your result instantly.
FAQ
Frequently asked questions
What is a right triangle?
A triangle with one 90-degree angle, where the Pythagorean theorem applies.
Which sides do I enter?
Enter the two shorter sides (legs) that meet at the right angle — the calculator finds the hypotenuse.
How is the area calculated?
Half the product of the two legs, since they form a right angle.
What if I only have the hypotenuse and one leg?
Use the Pythagorean Theorem Calculator, which can solve for a missing side.