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R-Squared from Pearson Correlation r Calculator

R² = r² — the share of variance explained.

Compute the coefficient of determination R² from a Pearson correlation r: R² = r². R² × 100 % is the share of variance in Y explained by a linear fit on X. Reports R² as a decimal and as a percentage.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

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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

R² = r²

In depth

Compute the coefficient of determination R² from a Pearson correlation r: R² = r². R² × 100 % is the share of variance in Y explained by a linear fit on X. Reports R² as a decimal and as a percentage.