Regression Calculator

Perform simple linear regression on a dataset.

Enter Data Points

Paste X,Y pairs (one per line or comma-separated)

X,Y Data

Regression Equation

y = x +

Slope (m)

Intercept (b)

R² (Coefficient of Determination)

Correlation (r)

Correlation Strength

Enter at least 2 data points to calculate regression.

Predict Y from X

Enter X value

Predicted Y

Scatter Plot with Regression Line

R² Interpretation

0.90 - 1.00: Very Strong

0.70 - 0.89: Strong

0.50 - 0.69: Moderate

0.30 - 0.49: Weak

0.00 - 0.29: Very Weak

Formulas

Slope: m = Σ(xy) − n·x̄·ȳ / Σ(x²) − n·x̄²

Intercept: b = ȳ − m·x̄

Correlation: r = Σ(xy) − n·x̄·ȳ / √[...][...]

R²: r²

Related Calculators

Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the regression figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.