Compute the line of best fit, R² correlation, slope, intercept, residuals, and predictions from any dataset. Includes scatter plot visualization.
Enter your X and Y data points — one pair per line, comma or tab separated
Residual = Actual Y − Predicted Y. Smaller residuals = better fit.
R² = 0.9–1.0
Very strong fit
R² = 0.7–0.9
Strong fit
R² = 0.4–0.7
Moderate fit
R² < 0.4
Weak fit