Method
For a right triangle, a² + b² = c². Rearranging gives a missing leg as √(c² − other-leg²).
Math worksheet
Right Triangle Calculator
Solve every side and angle of a right triangle, then derive its area, perimeter, altitude, radii and projections.
The calculation runs locally. Exact-integer tools avoid floating point; decimal and transcendental tools report rounding limits.
Method and verification guide
How the Right Triangle Calculator works
For a right triangle, a² + b² = c². Rearranging gives a missing leg as √(c² − other-leg²). The calculator keeps the intermediate values visible so you can reproduce the answer independently.
Interpret the result
The hypotenuse is opposite the right angle and must be the longest side.
Check the assumptions
The theorem applies only to Euclidean right triangles; rounded inputs can produce nearly, rather than exactly, integral triples.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
The theorem applies only to Euclidean right triangles; rounded inputs can produce nearly, rather than exactly, integral triples.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.