Measure how strongly two variables are related, with confidence intervals and scatter plots.
Pearson Correlation Calculator
Free Pearson correlation coefficient calculator. Paste X and Y from Excel to get r, r², p-value, 95% CI, a scatter plot and an APA 7 sentence.
Spearman Rank Correlation Calculator
Free Spearman rank correlation calculator for ordinal or non-normal data. Paste X and Y to get rho, p-value, 95% CI, scatter plot and an APA 7 sentence.
Linear Regression Calculator (Simple & Multiple)
Free simple and multiple linear regression calculator with SPSS-style output: model summary, ANOVA, coefficients, beta, VIF and an APA 7 write-up.
Which one do I need?
- Pearson Correlation Calculator: The Pearson correlation coefficient (r) measures the strength and direction of the linear relationship between two continuous variables, for example study hours and exam scores.
- Spearman Rank Correlation Calculator: Spearman’s rank-order correlation (ρ or rₛ) measures the strength and direction of a monotonic relationship between two variables.
- Linear Regression Calculator (Simple & Multiple): Linear regression predicts a continuous outcome (Y) from one predictor (simple regression) or several predictors (multiple regression), for example exam scores from study hours and sleep.