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Pearson Correlation Calculator
Compute Pearson r and r² between two variables. Includes interpretation (none, weak, moderate, strong) and significance test (degrees of freedom).
MATHCompute Pearson r and r² between two variables. Includes interpretation (none, weak, moderate, strong) and significance test (degrees of freedom).
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
Disclaimer: Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Pearson Correlation Calculator
Pearson r measures linear association between two variables (−1 to +1). r² (coefficient of determination) is variance explained.
Pearson r
0.9512
r² (variance explained)90.48%
Directionpositive
StrengthVery strong
n pairs8
Correlation ≠ causation. Pearson assumes linear relationship — use Spearman for monotonic non-linear or Kendall for ranked data.
Frequently Asked Questions
What is the Pearson Correlation Calculator for?
Compute Pearson r and r² between two variables. Includes interpretation (none, weak, moderate, strong) and significance test (degrees of freedom).
How do I use the Pearson Correlation Calculator?
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
How accurate are my pearson correlation results?
Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Is the Pearson Correlation Calculator free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.