Enter X and Y values, then click Calculate Correlation.

The Pearson correlation coefficient (r) measures the strength and direction of the linear relationship between two continuous variables. It ranges from -1 to +1. A value of +1 indicates a perfect positive linear relationship, -1 indicates a perfect negative linear relationship, and 0 indicates no linear relationship. The formula is r = Σ((xᵢ - x̄)(yᵢ - ȳ)) / √(Σ(xᵢ - x̄)² · Σ(yᵢ - ȳ)²), where x̄ and ȳ are the sample means. The coefficient of determination (r²) represents the proportion of variance in one variable explained by the other. The t-statistic tests whether the correlation is statistically significant. This calculator is widely used in statistics, data science, psychology, economics, and many other fields to quantify relationships between variables.

1. Enter the X Values in the first text area (comma or space separated).
2. Enter the Y Values in the second text area (same separator).
3. Both data sets must have the same number of values.
4. Click Calculate Correlation to compute Pearson’s r.
5. The result shows r, r², t-statistic, and interpretation.
6. Click Reset to restore default example values.