Simple Linear Regression Calculator (Free Online Tool with Graph)

Do you want to quickly calculate the linear regression equation, see the slope and intercept, and visualize your data with a scatter plot and regression line? This free online calculator makes it easy!

It is designed for students, teachers, economists, bankers, researchers, and data analysts who need a fast way to perform regression analysis without installing software.

What This Tool Does

• Computes the regression line: Y = b₀ + b₁·X
• Calculates slope (b₁) and intercept (b₀)
• Displays correlation coefficient (r) and R² (coefficient of determination)
• Plots a scatter diagram with the fitted regression line
• Works directly in your browser — no downloads, no Excel required!

How to Use

1. Enter your data pairs in the input box, one X, Y pair per line.
2. Click Calculate Regression.
3. The tool will instantly show the regression equation, correlation, R², and draw the graph.
4. Use Clear to reset and start again.

Example Input

Try pasting this sample dataset into the box:

1, 2
2, 3
3, 5
4, 4
5, 6

Expected output: a line close to Y = 1.3 + 0.9·X with a strong positive correlation.

Simple Linear Regression Calculator (Free Online Tool with Graph)

Why Use This Tool?

Linear regression is one of the most widely used methods in statistics, economics, and business research. It helps us understand the relationship between two variables, make forecasts, and test hypotheses. This tool is especially useful for:

• 🎓 Students learning regression analysis
• 📊 Teachers demonstrating concepts in class
• 🏦 Bankers & Economists analyzing financial data
• 📈 Researchers working with paired datasets