Pearson Correlation Calculator

Added 2026-08-29

Calculate Pearson’s r, r², covariance, t statistic and two-sided p-value from paired X/Y data.

✓ Runs locally in your browser✓ No account or dataset upload required✓ Effect sizes / uncertainty shown where appropriate

Paired X, Y valuesEnter one X,Y pair per line.

Pearson r

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r²

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Two-sided p

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t statistic

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Sample covariance

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Statistical output is a calculation aid. Check assumptions, study design and reporting requirements before drawing scientific conclusions.

Small time-saver of the dayCtrl + Y / Ctrl + Shift + ZCtrl + Y / Ctrl + Shift + Z: Redo an action after Undo

Use Ctrl + Y / Ctrl + Shift + Z to redo an action after Undo. A small habit that keeps keyboard-heavy work moving.

About this tool

Calculate Pearson’s r, r², covariance, t statistic and two-sided p-value from paired X/Y data.

Common uses

pearson r calculatorcorrelation coefficient calculatorpearson correlation p valuer squared calculator

How it works

1Enter or paste the requested sample values, summary inputs or contingency data.
2Choose the method, confidence level or test options when available, then run the calculation.
3Review the estimate/test statistic together with p-value, confidence interval, effect size and method notes where available.

Does this statistics calculation upload my data?

No. Entered values are processed locally in your browser with JavaScript.

Should I interpret statistical significance by itself?

No. Review effect size, confidence intervals, study design, assumptions, sampling and multiplicity together with the p-value.