Pearson Correlation Calculator
Calculate Pearson r and R² from paired X and Y datasets.
Pearson Correlation Calculator measures the strength and direction of linear association between two numeric variables. The correlation coefficient r ranges from -1 to +1: positive values indicate that variables tend to rise together, negative values indicate that one tends to fall as the other rises, and values near zero indicate little linear association. Correlation is standardized covariance, so it is unitless and unaffected by changing measurement units. It is sensitive to outliers and captures linear relationships only; curved relationships can have low Pearson correlation despite a strong pattern. A high correlation does not establish causation, because confounding variables, reverse causality, or shared trends can produce association without direct cause.