Correlation Calculator
Pearson r with r² and count; undefined if either variable has zero variance.
Limitation: Educational linear correlation—does not prove causation.
How to Use the Correlation Calculator
Pearson r with r² and count; undefined if either variable has zero variance.
Open the Correlation calculator and read field labels.
Match the mode
Educational linear correlation—does not prove causation.
What It Calculates
Pearson r with r² and count; undefined if either variable has zero variance.
Worked Examples
Strong positive
Inputs
Result
Perfect linear increase.
Moderate
Inputs
Result
Positive but not perfect.
Uncorrelated
Inputs
Result
Zero Y variance.
Check your mode
Educational linear correlation—does not prove causation.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorFormulas
Standard definitions with assumptions noted below.
Formula
Scientific Background
Standard statistics definitions with assumptions stated on-page. Educational only—not professional certification.
Sources & review
Correlation Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
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