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Linear Regression Calculator

Best-fit line for two paired data sets.

Fit an ordinary least-squares regression line to two equal-length lists of numbers and report slope, intercept, r, and r².

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

slope = Σ((x − x̄)(y − ȳ)) / Σ(x − x̄)²; intercept = ȳ − slope · x̄.

In depth

Fit an ordinary least-squares regression line to two equal-length lists of numbers and report slope, intercept, r, and r².