About us
About righttrianglecalculator.net
We build precise, fast, ad-light geometry tools that respect both your time and your attention. Right Triangle Calculator is the tool we wished existed when we were learning trigonometry - one that shows the shape, not just the number.
What we set out to fix
Most online triangle solvers give you a number and nothing else. You cannot see whether the triangle you described is the one you meant, and a single mistyped digit produces a confident, wrong answer.
Our solver draws the triangle to scale the instant it is solvable. If the shape on screen does not match the shape in your head, you have caught the error before it reaches your homework, your cut list or your drawing.
How the mathematics is verified
Every branch of the solver is derived from a closed-form identity - the Pythagorean theorem, the standard trigonometric ratios, or the base–height area relationship. There is no numerical iteration, so there is no convergence error.
Results are checked against known Pythagorean triples and the 30-60-90 and 45-45-90 special triangles, where the exact values are known in advance.
Privacy by construction
The calculator is a client-side script. Your measurements are computed in your browser and are never transmitted, logged or stored on a server. There is no account to create and nothing to delete.
Who this is for
Students checking trigonometry homework, machinists working out a taper, carpenters squaring a frame, surveyors reducing a traverse, and engineers who just need a fast, trustworthy answer without opening a CAD package.
What we hold ourselves to
Correct first
An impossible triangle gets an explanation, never a plausible-looking number.
Visible reasoning
We publish the formula behind every result so you can check our work.
Fast and quiet
No pop-ups, no account walls, no measurement ever leaves your device.
Two values in. The whole triangle out.
Used by students, machinists, carpenters, surveyors and engineers.