Mathlean · Online math workspace

Curve fitting calculator

Fit a parameterized model to data using supported nonlinear least squares.

How to use this calculator

Edit FindFit(data,model,parameters,variable). The starter fits a line with slope 2 and intercept 1. Read the parameter record together with the convergence flag and residual norm.

Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.

Try it here

FindFit⁡([(0,1),(1,3),(2,5)],a∗x+b,[a,b],x)\operatorname{FindFit}\left([(0,1),(1,3),(2,5)],a*x+b,[a,b],x\right)

Interactive tools require JavaScript. You can read the guide and example without it.

What to know

A fit is numerical, not an exact identity or a statistical confidence interval. Starting values and bounds matter; a nonconverged result is not a successful fit. Read the convergence and residual rows together with the parameters.

Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.

Browse all calculators and editors