🔗Correlation Coefficient Calculator
Enter paired x, y data — one pair per line — to find Pearson's correlation coefficient.
One pair per line, separated by a comma or space. Needs at least 2 pairs.
Free Correlation Coefficient Calculator
This correlation calculator finds Pearson's correlation coefficient (r), which measures the strength and direction of the linear relationship between two variables. Values range from −1 (perfect negative correlation) to +1 (perfect positive correlation), with 0 meaning no linear relationship.
Paste your paired x, y data — one pair per line — and the calculator computes r, the coefficient of determination (r²), a plain-language strength label, and plots the points on a scatter chart so you can visually confirm the trend.
Useful for research, coursework, or quickly checking whether two variables move together. Free, runs entirely in your browser, no sign-up required.