How this calculator works
Enter the values for first value, second value and review the units before calculating.
Formula / method
r = covariance(X,Y) ÷ (σx × σy)
Worked example
Perfectly increasing pairs such as (1,2), (2,4), (3,6) return r = 1.
Assumptions and limitations
Pairs are aligned by position and both variables are numeric.
Correlation is not causation and can miss nonlinear relationships or outliers.