Free Tool

Correlation Calculator

Calculate Pearson correlation coefficient between two variables. Get R-squared, interpretation, and understand the strength and direction of relationships.

Enter Your Data

Enter comma-separated values for two variables to calculate their correlation.

Enter numbers separated by commas, spaces, or new lines
Must have the same number of values as X

Your Correlation Results

Pearson r
-
Correlation coefficient
R-Squared
-
Coefficient of determination
Direction
-
Positive or negative
Strength
-
Weak, moderate, or strong
Sample Size (n)
-
Number of pairs
Interpretation
-
Meaning of result

Download Correlation Analysis Guide

Get our free PDF with correlation interpretation guidelines, examples, and best practices.

Understanding Correlation

Correlation measures the strength and direction of the linear relationship between two variables. The Pearson correlation coefficient ranges from -1 to +1.

Interpreting Correlation Coefficients

Strength Guidelines:

  • 0.00 - 0.19: Very weak correlation
  • 0.20 - 0.39: Weak correlation
  • 0.40 - 0.59: Moderate correlation
  • 0.60 - 0.79: Strong correlation
  • 0.80 - 1.00: Very strong correlation

Important Notes:

Correlation does not imply causation. A high correlation between two variables doesn't mean one causes the other. Always consider the context and potential confounding variables.