SHAPES, DATA, AND SCHOOL MATH
Calculate the main measurements of a right triangle from the lengths of its two perpendicular legs.
Your result
Enter your values and select Calculate. Your result stays on this device.
c = √(a² + b²); acute angles use inverse tangent; area = a × b ÷ 2.
The entered sides are the two perpendicular legs; displayed angles are in degrees.
Use this right triangle calculator when the search task goes beyond one missing side. A single calculation returns the hypotenuse, both acute angles, area, and perimeter.
Use case
Calculate the hypotenuse, both acute angles, area, and perimeter from two legs entered in one consistent unit.
Solve a right triangle from its two perpendicular legs, including side, angle, area, and perimeter results.
Build a reliable scenario
Right Triangle Calculator helps you check a specific geometry & statistics question with figures that apply to you. Calculate the main measurements of a right triangle from the lengths of its two perpendicular legs. Calculate the hypotenuse, both acute angles, area, and perimeter from two legs entered in one consistent unit. Solve a right triangle from its two perpendicular legs, including side, angle, area, and perimeter results. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
Prepare Leg a and Leg b. Enter both perpendicular leg lengths in the same unit. Calculate the hypotenuse with the Pythagorean theorem. Review the two acute angles and confirm they total 90 degrees. Use the area and perimeter only after checking that the triangle is right-angled. Keep units, dates, currency, and time periods consistent.
The stated method is: c = √(a² + b²); acute angles use inverse tangent; area = a × b ÷ 2. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
The entered sides are the two perpendicular legs; displayed angles are in degrees. Check the input and rounding, then calculate again.
Method and update
Last reviewed: 2026-08-22. This tool performs the stated formula locally in your browser using the values you enter.
Yes when the two known sides are the perpendicular legs. The remaining side and acute angles can then be calculated.
Yes. Together with the right angle, all triangle angles total 180 degrees.
Use one consistent length unit. The side and perimeter results use that unit; area uses its square.
Keep exploring
Clear calculation guide
This free Right Triangle Calculator keeps the values and the calculation method visible instead of returning an unexplained number. Calculate the main measurements of a right triangle from the lengths of its two perpendicular legs. Use it to check a scenario with the figures that apply to you.
Start by checking units, dates, decimal places, and the option you selected. Use this right triangle calculator when the search task goes beyond one missing side. A single calculation returns the hypotenuse, both acute angles, area, and perimeter. The stated mathematical method is: c = √(a² + b²); acute angles use inverse tangent; area = a × b ÷ 2.
Change one assumption at a time to understand what moves the result, then keep any final record or institution-specific rule separate from the arithmetic. The entered sides are the two perpendicular legs; displayed angles are in degrees. Hesaplayın is a clear, browser-based calculator for checking the maths behind your decision.