The calculation, without hidden assumptions
Slope is one relationship expressed several ways. Enter the rise and the run and this calculator returns the decimal slope, percent grade, angle in degrees, 1:n ratio and the straight-line length along the slope, so you can move between drainage, ramp, roof and road conventions without separate conversions.
How to use this calculator
Enter the vertical rise and the horizontal run in the same unit.
Review the decimal slope, percent grade and angle.
Use the ratio and slope length for layout and material lengths.
Where people use it
- •Drainage and site grading
- •Ramp, driveway and pipe fall layout
- •Converting between percent grade and degrees
Example: 1 over 10
Grade is 10% and angle about 5.71°.
What the result does not assume
- •Geometry only; check applicable codes and standards for allowable slopes.
- •Run must be horizontal distance, not the length measured along the slope.
Frequently asked questions
Is 10% equal to 10 degrees?+
No. 10% is about 5.71°.
What is the difference between rise over run and percent grade?+
Percent grade is rise divided by run multiplied by 100, so a rise of 1 over a run of 10 is a 10% grade.
Can the rise be negative?+
Yes. A negative rise describes a downward slope and gives a negative grade and angle; the run must stay positive.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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