About the Correlation Coefficient Calculator
A free tool for measuring the linear relationship between two variables.
What it is
This calculator computes Pearson's correlation coefficient (r) from paired x, y data, along with rยฒ and a plain-language strength label. It also plots your data as a scatter chart with a best-fit line, so you can see the relationship, not just the number.
Features
Pearson's r and rยฒ
Both the coefficient and its interpretation as explained variance.
Strength label
A plain-language read on how strong the relationship is.
Scatter plot
Visualize your data points with a best-fit trend line.
Instant, private
Runs entirely in your browser. No data is sent anywhere.