Calculate the Pearson correlation coefficient (r) between two paired data sets.
How It Works
How Correlation Coefficient Calculator Works
The Pearson correlation measures how closely two variables move together in a straight-line relationship, on a scale from −1 (perfectly opposite) to +1 (perfectly aligned), with 0 meaning no linear relationship at all.
FAQ
Frequently Asked Questions
Does a strong correlation mean one variable causes the other?
No — correlation only measures how closely two variables move together, not why. Two variables can be strongly correlated because one influences the other, because a third factor drives both, or purely by coincidence.
What counts as a "strong" correlation?
There's no universal cutoff, but as a rough guide, |r| above 0.7 is often considered strong, 0.3–0.7 moderate, and below 0.3 weak — though the right threshold varies by field.
