Math
Distance between two points
Measure straight-line distance between two Cartesian points.
Calculators / Math / Slope of a line
Slope of a line calculator
Find slope and y-intercept from two points.
On this page
Slope2
Y-intercept0
Calculator controls
How to calculate
Find slope and y-intercept from two points.
Slope = (y2-y1)/(x2-x1); Y-intercept = y1-(y2-y1)/(x2-x1)*x1
Worked example
First x coordinate: 1; First y coordinate: 2; Second x coordinate: 4; Second y coordinate: 8.
Slope: 2 ; Y-intercept: 0 .
Assumptions and limits
A vertical line has zero horizontal change, so its slope is undefined. Its equation is x equal to the common x coordinate.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Slope is vertical change divided by horizontal change. The intercept completes the line equation y = mx + b.
When this tool is useful
Find slope and y-intercept from two points.
Understanding your inputs
| Input | What to enter |
|---|---|
| First x coordinate | Enter a number of at least -1000000000 and no more than 1000000000. |
| First y coordinate | Enter a number of at least -1000000000 and no more than 1000000000. |
| Second x coordinate | Enter a number of at least -1000000000 and no more than 1000000000. |
| Second y coordinate | Enter a number of at least -1000000000 and no more than 1000000000. |
Frequently asked questions
Why are vertical lines rejected?
A vertical line has zero horizontal change, so its slope is undefined. Its equation is x equal to the common x coordinate.