Slope Calculator
Find the slope, y-intercept and equation of the line through two points.
Slope (m)
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y-intercept (b)
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Line equation
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Angle of incline
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Distance between points
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Results update as you type.
About this calculator
The slope of a line measures its steepness — the rise over the run between two points. This calculator computes the slope m = (y₂ − y₁) / (x₂ − x₁), the y-intercept, and the equation of the line in slope-intercept form y = mx + b. A vertical line has an undefined slope.
Frequently asked questions
How do you calculate slope from two points?
Slope = (y₂ − y₁) / (x₂ − x₁), the change in y divided by the change in x. From (0,0) to (3,6) the slope is 6/3 = 2.
Why is a vertical line’s slope undefined?
A vertical line has no change in x, so the slope formula divides by zero. Its equation is x = constant instead of y = mx + b.
Results are estimates for general guidance only, not financial, medical or tax advice.