Correlation Coefficient Calculator (Pearson r)
Math ToolsPearson correlation between two lists of numbers
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All history →Correlation Coefficient Calculator (Pearson r) — at a glance
Measure how strongly two variables move together.
How to use it — step by step
One x, y pair per line.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Press Calculate r
The result is made instantly inside your browser.
Copy the result
Use the Copy button, or send it to another tool.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is a strong correlation?+
Values with an absolute r above about 0.7 are usually called strong.
Does it show cause?+
No. Two things can move together without one causing the other.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.