Right Triangle Solver
Solve a right triangle from any two known values. Choose which pair you know — two legs, a leg and the hypotenuse, or a leg and its opposite angle — and the solver fills in the rest.
Inputs explained
- Known values — Which pair of measurements you already know.
- Leg a — One of the two perpendicular sides. Always required.
- Leg b — The other perpendicular side (two-legs mode).
- Hypotenuse c — The longest side, opposite the right angle. Must be greater than leg a.
- Angle A (opposite leg a) — The acute angle opposite leg a, between 0° and 90°.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: With legs a = 3 and b = 4 the hypotenuse is 5, the angles are 36.87° and 53.13°, and the area is 6.
Frequently asked questions
Why do I need to specify which two values I know instead of just entering all fields? Different input combinations (two legs, a leg and hypotenuse, or a leg and angle) require different formulas to solve the triangle, so selecting the known pair tells the calculator which method to apply.
Can this solver handle a triangle where I only know one angle and no sides? No, at least one side length is required along with an angle or another side, since angles alone don't determine a triangle's actual size, only its shape.
Is the Right Triangle Solver free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Known values, Leg a, Leg b, Hypotenuse c, Angle A (opposite leg a). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Right Triangle Solver is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.