Calculate slope for construction, drainage, roofing, landscaping, and ADA ramps. Enter rise and run to get instant results.
Enter rise and run to see the slope diagram
Common Slope Reference Chart
| Inches/Foot | Percentage | Degrees | Ratio |
|---|
How to Use & Formula
Formula
Slope (in/ft)
=
Rise (inches)
÷
Run (feet)
Where Rise is the vertical height change in inches, and Run is the horizontal distance in feet.
Steps to Calculate
1
Measure the vertical rise (height difference) in inches.
2
Measure the horizontal run (distance) in feet.
3
Enter both values into the calculator above.
4
Results appear automatically — slope in inches per foot, percentage, degrees, and ratio.
Example
Rise = 3 inches
→
Run = 12 feet
→
Slope = 3 ÷ 12 = 0.25 in/ft
This equals a 2.08% grade, 1.19° angle, or a 1:48 ratio — typical for a flat roof or walkway drainage.
