Curve → Formula | Jikken Ranch

Draw a line on the graph with your finger or mouse, and the tool finds the closest-matching formula using least squares. It picks the best fit among polynomial, trigonometric, exponential, and other models, and for Unreal Engine it can output HLSL for a Custom node or a ready-to-paste material node graph.

X –

Y –

Drag here to draw

Best fit

Nothing drawn yet.

Round the coefficients to tidy up the formula

R² · goodness of fit —

RMSE · average error —

Unreal Engine

Formula type

Accuracy ↔ shorter formula Balanced

Significant digits 4

Your line is resampled into evenly spaced points and fitted to every model by least squares. Auto weighs how closely a model follows the shape against how short its formula is. Copied formulas use ^ and exp() sin() ln() notation, so they paste almost as-is into Desmos or a spreadsheet. Everything runs inside this page — nothing is sent anywhere, and no AI is involved.