Correlation Calculator

Free correlation calculator to calculate correlation coefficient. Instant results in your browser — no signup.

JavaScript is required for live calculation.

You can still read how Correlation Calculator works, the formula, examples, and FAQs below.

X values (comma-separated)
Y values (comma-separated)

Direct calculator

Inputs

X values (comma-separated)

Y values (comma-separated)

Results update when you click Calculate.

Pearson r

0.7746

Strong positive linear association

r²0.6000

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What this result means

Free correlation calculator to calculate correlation coefficient. Instant results in your browser — no signup. r = Cov(X,Y) / (σ_X σ_Y); always between −1 and 1.

Assumptions

Rule dependency: Universal formula.

How is it calculated?

r = Cov(X,Y) / (σ_X σ_Y); always between −1 and 1.

Example

Perfect upward trend → r ≈ 1.

Frequently asked questions

Causation?+

Correlation does not imply causation.