Scatter Plot Generator

A scatter plot (also called an XY graph) is a type of data visualization that displays pairs of values as individual points on a two-dimensional grid. The horizontal axis represents the independent variable (X) and the vertical axis represents the dependent variable (Y). It's commonly used to identify relationships, trends, or correlations between two variables.

Enter your X values and Y values as comma-separated numbers in the respective input boxes — for example, '1, 2, 3, 4' and '2, 4, 5, 7'. Both lists must have the same number of values. Optionally add a chart title and axis labels, then click Generate. The scatter plot and regression statistics are produced immediately.

A line of best fit, or linear regression line, is a straight line drawn through a scatter plot that best represents the overall trend of the data. It minimizes the sum of squared residuals (the vertical distances between each point and the line). Enable the 'Show Line of Best Fit' option to overlay this line on your chart.

The correlation coefficient (r) measures the strength and direction of the linear relationship between X and Y. Values range from −1 to +1. A value near +1 indicates a strong positive correlation, near −1 indicates a strong negative correlation, and near 0 indicates little to no linear relationship. Generally, |r| > 0.7 is considered strong, 0.4–0.7 moderate, and below 0.4 weak.

R² (the coefficient of determination) is the square of the correlation coefficient r. It represents the proportion of variation in Y that can be explained by the linear relationship with X. For example, R² = 0.85 means 85% of the variability in Y is accounted for by the regression line. While r shows direction and strength, R² focuses purely on explanatory power.

The slope (m) tells you how much Y changes for every one-unit increase in X. A positive slope means Y increases as X increases; a negative slope means Y decreases. The intercept (b) is the predicted value of Y when X equals zero — the point where the regression line crosses the Y-axis. Together, they define the equation ŷ = mx + b.

Both lists must contain the same number of values. If they differ, the tool will alert you and will not generate the plot. Check for missing commas, extra spaces, or unequal entries. Each X value must correspond to exactly one Y value.

Yes — the scatter plot generator fully supports negative numbers (e.g. '-3, -1, 2, 5') and decimal values (e.g. '1.5, 2.7, 3.14'). Simply enter them as comma-separated values in the input boxes. The axes will automatically scale to fit your data range.