Slope calculator

It takes x₁, y₁, x₂ and y₂ and derives Slope (m) and y-intercept (b) from them. The calculation is live as you type, so the result updates on every change.

4 values: x₁, y₁, x₂ and y₂. Nothing else is required — no account, no file upload.

With x₁ = 1, y₁ = 2, x₂ = 4 and y₂ = 10, the calculator returns Slope (m) = 2.667 and y-intercept (b) = -0.667. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

It moves a lot. Using x₁ = 2, y₁ = 4, x₂ = 8 and y₂ = 20 instead, y-intercept (b) goes from -0.667 to -1.333 — which is why it is worth testing a few scenarios rather than trusting a single figure.

Scaled down to x₁ = 1, y₁ = 1, x₂ = 2 and y₂ = 5, Slope (m) comes out at 4. The relationship is worth checking at both ends before you rely on a single result.

Homework and site work alike: how much paint a wall takes, how much water a tank holds, whether a corner is square — and, on the coordinate side, the slope between two points, the distance across a plan, the midpoint of a span.

Mixing units inside one shape. Entering a length in centimetres and a width in metres gives an area wrong by a factor of a hundred, and the result looks perfectly plausible.

This one returns Slope (m) and y-intercept (b); the Point-Slope Form Calculator returns Result. That is the whole difference — open the one whose figure you need.

Slope-Intercept Form Calculator is the closest one after this: Reduce any line — from two points, a point and slope, or standard form — to y = mx + b.

The formulas are the classical ones and the results are exact to the precision shown — geometry does not change with the year or the country, so nothing here needs updating.