Slope calculator

Find a line’s slope and y-intercept from two points.

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First x coordinate

First y coordinate

More inputs and assumptions

Second x coordinate

Second y coordinate

Answer

…

Slope = (second y − first y) ÷ (second x − first x). Y-intercept = first y − slope × first x.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

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Formula and assumptions

The two points must have different x coordinates for a finite slope. Coordinate units determine the slope units; vertical lines are reported as undefined.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Slope calculator

Slope = (second y − first y) ÷ (second x − first x). Y-intercept = first y − slope × first x.

The two points must have different x coordinates for a finite slope. Coordinate units determine the slope units; vertical lines are reported as undefined.

Next: System of equations solver

A worked example

With first x coordinate = 1, first y coordinate = 2, second x coordinate = 3, second y coordinate = 6, the slope is 2.

Next: Midpoint calculator

Before you use the result

The two points must have different x coordinates for a finite slope. Coordinate units determine the slope units; vertical lines are reported as undefined.

Example results for first x coordinate

These examples use First y coordinate: 2; Second x coordinate: 3; Second y coordinate: 6. They are reference calculations, not recommended settings.

First x coordinate	Slope
0.5	1.6
1	2
2	4

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