Correlation Calculator
Pearson correlation coefficient between two data sets.
Correlation (r)
0.852803
strong positive relationship
r²
0.727273
Strength
strong
Pairs used
5
ShowHide the working
- 1Pearson r = covariance ÷ (σx × σy) = 0.852803
- 2r² = 0.7273 — the share of variance explained
Formula
r = Σ(x−x̄)(y−ȳ) ÷ √(Σ(x−x̄)²·Σ(y−ȳ)²)How it works
Pearson's r measures how strongly two variables move together, from −1 (opposite) through 0 (none) to +1 (identical).
Example
The X/Y pairs above have r ≈ 0.83 — a strong positive correlation.
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About the Correlation Calculator
Pearson correlation coefficient between two data sets. It sits in the Statistics section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Correlation Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Correlation Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Correlation Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Statistics?
- Mean, deviation, regression, probability and distributions. You can browse the full Statistics category for related calculators.