🔗 Correlation Coefficient
Pearson r for paired data
About this calculator
Pearson's correlation coefficient measures how tightly two variables move together in a straight line, from -1 to +1. Paste paired x,y data and get r, its strength label, and R squared.
Tip: always plot your data too, because a single outlier can fake a strong correlation, and curves score near zero even when the relationship is real.