Slope Calculator
Compute line slope from two points with intercept form — rise over run done right. Get m and b for graphing — free, local, no signup.
How to Use the Slope Calculator
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Frequently Asked Questions
Slope formula?
(y₂−y₁)/(x₂−x₁) with substitution shown. Positive climbs right, negative falls, zero is flat.
Undefined slope?
Vertical lines (x₁=x₂) divide by zero — undefined, not infinite. The tool reports it correctly.
Intercept too?
Yes — y = mx + b fully determined from two points. Graph-ready equation output.
Do line points upload?
No — math runs locally in your browser. Numbers never leave your device.
Slope through (1,2) and (5,10)?
Rise 8 over run 4 gives m = 2; back-substituting, 2 = 2(1) + b so the intercept is 0. The tool draws the same line it computes.
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Last updated October 2026