Correlation Calculator
Measure the Pearson correlation between two paired data sets.
Pearson correlation (r)
0.9157
strong positive
r² (variance explained)
83.9%
Pairs
6
Reading r
Pearson's r runs −1 to +1, measuring how tightly points hug a straight line: +1 perfect rise, −1 perfect fall, 0 no linear pattern. Squaring it gives the share of one variable's variance the other explains — r = 0.7 explains about half.
The two classic caveats
Correlation isn't causation — ice cream sales and drownings correlate through summer. And r only sees straight lines: a perfect U-shaped relationship scores near zero. Always plot the data before trusting the number.
Related calculators
Percentage Calculator
Solve any percentage problem: percent of, percent change, and more.
Fraction Calculator
Add, subtract, multiply, and divide fractions with simplified results.
Scientific Calculator
A full scientific calculator with trig, logs, and exponents.
Random Number Generator
Generate random numbers in any range, with or without repeats.