Correlation Calculator
Enter two matched data sets and get the Pearson correlation coefficient r with its strength, plus the regression line with steps — a clear way to check how strongly two variables move together.
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How to use
- Enter the X and Y values in the same order — each X pairs with the Y in the same position.
- Both lists must have the same number of values.
- The r value, its strength and the regression line will appear with steps.
Note: Pearson correlation only measures a linear relation. Correlation does not mean causation — the two variables may be linked through a third cause.
Tips
- Pearson r only detects straight-line relationships — a curved pattern can show r near zero.
- Enter X and Y in the same order so each pair stays matched.
- Correlation is not causation — a third factor may drive both variables.
- Outliers can distort r heavily, so scan your data for stray values first.
Frequently Asked Questions (FAQ)
What does the Correlation Calculator calculate?
The correlation coefficient r between two data sets, with steps shown.
What kind of correlation is it?
Pearson correlation, which only measures a linear relation.
Does correlation mean causation?
No — the two variables may be linked through a third cause.
Is it free?
Yes, free to use with no signup.