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Correlation Coefficient Calculator

Calculate Pearson’s correlation coefficient from paired x and y data.

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Correlation coefficient (r)

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Correlation strength

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Results are mathematical estimates. Statistical calculations depend on the entered data and assumptions; they do not establish causation or replace expert review.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the Correlation Coefficient Calculator

  1. 1 Enter the numbers or data requested.
  2. 2 Choose the calculation option when available.
  3. 3 Review the result and its assumptions.

How the Correlation Coefficient Calculator works

Pearson’s r ranges from −1 to +1 and measures the direction and strength of a linear association. Correlation alone does not show that one variable causes another.

Entering your data

Use the values or comma-separated observations requested above. Check that you use consistent units and include every value relevant to the calculation.

Understanding the result

The result follows the formula shown here and is rounded for display. It is a mathematical aid; check assumptions and data quality before using it in coursework, analysis or a decision.

Frequently asked questions

How is this result calculated?

Pearson’s r ranges from −1 to +1 and measures the direction and strength of a linear association. Correlation alone does not show that one variable causes another.

Can I use the result as a guarantee?

No. The result depends on the inputs and stated assumptions. Review the data and method before relying on it.

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