This slope calculator finds the slope from rise and run, expressed as a ratio, a percentage grade, and an angle in degrees. Enter the rise and run above for instant results.
Formulas
Slope ratio = Rise ÷ Run Percent grade = (Rise ÷ Run) × 100 Angle = arctan(Rise ÷ Run)
Example
Rise 3, Run 12: ratio = 0.25, grade = 25%, angle = arctan(0.25) = 14.04°.
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Frequently Asked Questions
How do I calculate slope from rise and run?
Divide the rise by the run. Multiply by 100 for percent grade, or take the arctangent for the angle.
What is percent grade?
It is the slope expressed as a percentage: rise divided by run, times 100. A 25% grade rises 25 units per 100 of run.
How do I convert slope to degrees?
Take the arctangent of rise divided by run. A 0.25 slope is about 14 degrees.