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# Slope calculator

Find the slope through two points with line equations, percent grade, and angle, and convert back from a grade, angle, or ratio to a slope.

Enter two points, a rise and run, or one grade value.

Percent grade and angle in degrees are different scales, and mixing them is the classic mistake: a 100 percent grade is 45 degrees, not 100. Percent means rise per 100 of run, so 10 percent is one unit up in ten across. The 1:12 figure is the ADA ramp ceiling, and road signs quote percent. A vertical line has no slope at all, which is why the grade reads as infinite rather than 100 or any other number.
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## More unit & math tools

- [Aspect ratio and DPI](/converters/aspect-ratio)
- [Unit converter](/converters/units)
[All unit & math tools](/converters)

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