What does a correlation of 0.8 mean?

r = 0.8 indicates a strong positive correlation. As X increases, Y tends to increase. Values above 0.7 are generally considered strong; above 0.9 is very strong.

Does correlation imply causation?

No. Two variables can be strongly correlated due to a third variable (confounding) or pure coincidence. Correlation measures association, not causation.

Correlation Coefficient Calculator

Quick answer: Enter two sets of paired numbers to calculate Pearson r, R², and interpret the correlation strength.

Calculate the Pearson correlation coefficient (r) between two variables. Enter paired x and y values to measure the strength and direction of the linear relationship.

Last reviewed: April 2026Report an error

X Values

Y Values

Correlation (r)

0.7746

r = 0.7746, R² = 0.6000. Strong positive correlation

r (Pearson)

0.7746

R²

0.6000

Interpretation

Strong positive correlation

How to Use This Correlation Calculator

1Enter your X values (comma-separated).
2Enter your Y values in matching order.
3Read Pearson r, R², and the interpretation (weak/moderate/strong).

Frequently Asked Questions

: r = 0.8 indicates a strong positive correlation. As X increases, Y tends to increase. Values above 0.7 are generally considered strong; above 0.9 is very strong.
: No. Two variables can be strongly correlated due to a third variable (confounding) or pure coincidence. Correlation measures association, not causation.

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