How to use the Correlation Coefficient Calculator
Fill in the fields above and the result appears straight away. Everything runs in your browser, so nothing you type is uploaded.
How it works
Calculated from the inputs shown in this tool.
Examples
- A perfect positive line
Pearson correlation: 1
- A perfect negative line
Pearson correlation: -1
- A noisy relationship
Pearson correlation: 0.82857143
Limitations and assumptions
Confirm assumptions, units and applicable local rules before relying on results. Detailed content, accessibility and edge-case review remains ongoing.
Frequently asked questions
What does correlation mean?
The strength and direction of a linear relationship between two variables.
Does correlation prove cause?
No. Two things can move together because of a third factor or by chance.
What is a strong correlation?
Values beyond about 0.7 in either direction are usually called strong.
Do the lists need equal length?
Yes, each pair is matched in order.