Correlation Coefficient Correlation Coefficient Calculator (Pearson’s r) Paste two columns of numbers and we’ll compute the Pearson correlation coefficient r, r², sample size, and the best-fit line. This is the classic statistic to measure linear association. Enter your data Separate values with comma, space, semicolon, or line break. X and Y must have the same length. X values variable X 10, 12, 15, 18, 20 Y values variable Y 8, 11, 14, 17, 19 Decimal places 2 3 4 Calculate correlation Results Pearson r – r² (explained) – n (pairs) – Direction – Least-squares regression line (Y on X) – Interpretation: for every 1-unit increase in X, Y changes by the slope. Correlation coefficient formula This calculator uses the sample Pearson correlation coefficient: r = Σ[(xᵢ − x̄)(yᵢ − ȳ)]

Calculators in Correlation Coefficient Correlation Coefficient Calculator (Pearson’s r) Paste two columns of numbers and we’ll compute the Pearson correlation coefficient r, r², sample size, and the best-fit line. This is the classic statistic to measure linear association. Enter your data Separate values with comma, space, semicolon, or line break. X and Y must have the same length. X values variable X 10, 12, 15, 18, 20 Y values variable Y 8, 11, 14, 17, 19 Decimal places 2 3 4 Calculate correlation Results Pearson r – r² (explained) – n (pairs) – Direction – Least-squares regression line (Y on X) – Interpretation: for every 1-unit increase in X, Y changes by the slope. Correlation coefficient formula This calculator uses the sample Pearson correlation coefficient: r = Σ[(xᵢ − x̄)(yᵢ − ȳ)].