Correlation Calculator
Measure the linear relationship between two data sets with Pearson r.
How strongly do two things move together?
The Pearson correlation coefficient boils the relationship between two variables down to a single number between -1 and 1. It is the standard measure of how tightly two data sets move together.
A value near 1 means they rise together, near -1 means one falls as the other rises, and near 0 means little linear link. Enter matching X and Y lists to get the coefficient and its strength.
Careful and private
It computes Pearson r in your browser, so your data never leaves your device.
Frequently Asked Questions
What does the coefficient mean?
Pearson r ranges from -1 to 1. Near 1 is a strong positive relationship, near -1 strong negative, and near 0 little linear relationship.
How do I enter data?
Put your X values on one line and the matching Y values on the next, in the same order and count.
Does correlation imply causation?
No. A high correlation shows the variables move together, not that one causes the other.
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