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Correlation Calculator
Find the Pearson correlation coefficient between two lists of numbers, with the coefficient of determination and covariance.
Correlation between two lists
Pearson r: —
R squared: —
Covariance: — · Pairs: —
Strength: —
How to use the Correlation Calculator
- Paste your first list of numbers into the top box.
- Paste the matching second list into the box below it.
- Read the correlation, R squared and covariance in the result panel.
Features
- Pearson correlation coefficient
- R squared and covariance included
- Strength rating from very weak to very strong
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online correlation calculator.
Paste your two lists of numbers in matching order and the Pearson r appears instantly.
It runs from minus 1 for a perfect negative link, through 0 for no relationship, to plus 1
for a perfect positive one.
As a guide, values above 0.7 or below minus 0.7 are strong, while values near 0 show little
relationship.
No. A high correlation only shows that two variables move together, not that one causes the
other.
It is the correlation squared, and it shows the share of the variation in one list explained
by the other.
Yes. The tool pairs values in order, so it uses only as many pairs as the shorter list
provides.
Yes. A negative r means that as one list rises the other tends to fall, giving a downward
relationship.
Covariance measures how two lists vary together, but unlike r its size depends on the units
used.
No. The correlation is computed in your browser and your numbers never leave your device.
Yes. It is completely free and unlimited, with no account, no sign-up and no usage caps.
Last updated: October 10, 2026