Correlation Calculator
Calculate the Pearson correlation coefficient between two datasets to measure linear relationship strength.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Correlation Calculator
This calculator computes the Pearson correlation coefficient (r) between two paired sets of values (X and Y). Follow these steps:
- Enter X values in the left text area. Separate numbers by commas or spaces (e.g.,
1, 2, 3, 4, 5). - Enter Y values in the right text area, using the same format. Each pair (X,Y) must have the same number of values.
- Click "Calculate Correlation" to see the result.
What you get:
- r value (ranges from -1 to 1). Positive = positive correlation, negative = inverse correlation.
- Strength (very weak, weak, moderate, or strong) based on |r|.
- Step-by-step breakdown showing means, sums, and the formula used.
Tips:
- Enter at least 2 pairs of numbers for a valid result.
- Values can be integers or decimals. No letters or symbols.
- If X and Y have different counts, an error will appear.
Previous Results
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Frequently Asked Questions
Pearson correlation (r) measures the linear relationship between two variables, ranging from -1 to 1. 1 indicates perfect positive correlation, -1 perfect negative, and 0 no linear correlation.
Enter X and Y values separated by commas or spaces. Each pair must have the same number of values. For example: X: 1,2,3,4,5 and Y: 2,4,5,4,5.
The calculator expects complete pairs. Missing values will cause an error. Ensure each dataset has the same number of numeric entries.
