Slope calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
m = (y₂ − y₁) ÷ (x₂ − x₁)
Where this usually goes wrong
A vertical line has no slope — the denominator is zero, and that is undefined rather than infinite.
Worked example
From (1,2) to (4,11) the slope is 3.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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