Correlation Calculator
Measures how strongly two sets of paired values move together, reporting Pearson's r from -1 to 1, the r squared value, the covariance, and the mean of each column. Enter one "x, y" pair per line. A plain-language reading of the strength and direction is included alongside the numbers.
Measures how strongly two sets of paired values move together, reporting Pearson's r from -1 to 1, the r squared value, the covariance, and the mean of each column. Enter one "x, y" pair per line. A plain-language reading of the strength and direction is included alongside the numbers.
Use cases
- Checking whether two measurements rise and fall together
- Reporting the correlation for a lab write-up
Examples
Four pairs
1, 3 2, 5 3, 8 4, 10
{"n": 4, "pearson_r": 0.9965, "r_squared": 0.9931, "covariance": 4.0, "mean_x": 2.5, "mean_y": 6.5, "interpretation": "very strong positive"}FAQ
Is my data sent to a server?
Yes — the calculation runs on the server for this tool.
Does a correlation mean one thing causes the other?
No. Correlation measures how closely two sets of values move together, and says nothing about cause.
What do the strength labels mean?
They band the size of r: 0.9 and above is very strong, 0.7 strong, 0.5 moderate, and 0.3 weak. They are a reading aid, not a significance test, which also depends on how many pairs you have.