Calculate Slope in Percentage
Slope percentage calculation is essential in construction, civil engineering, and landscaping to determine incline steepness for roads, ramps, and drainage systems. It helps ensure safety standards, proper water runoff, and ADA compliance.
Formula
Slope Percentage = (Rise ÷ Run) × 100
How to Use
1. Enter vertical rise (height difference) in meters/feet
2. Enter horizontal run (distance) in same units
3. Click Calculate
4. View slope percentage result
5. Use Clear button to reset
FAQs
What does slope percentage mean?
Slope percentage represents the ratio of vertical rise to horizontal run multiplied by 100. A 10% slope means 10 units vertical change per 100 units horizontal distance. It's standard measurement for road grades, wheelchair ramps, and roof pitches.
How is slope percentage different from angle?
While slope percentage uses rise/run ratio, angle measures incline in degrees. 100% slope equals 45 degrees. Percentage is better for construction measurements, while angles are more common in trigonometry.
What's the maximum slope for wheelchair ramps?
ADA recommends maximum 8.33% slope (1:12 ratio). This means 1 inch rise per 12 inches run. Steeper slopes can be dangerous for wheelchair users and may violate accessibility standards.
Can I calculate slope percentage in feet?
Yes, slope percentage works with any unit as long as rise and run use same measurement. Convert all measurements to same units before calculating.
What's a 100% slope?
100% slope means elevation gain equals horizontal distance (45 degree angle). Each unit forward equals one unit upward. Steeper than 100% slopes are expressed as ratios (e.g., 2:1 slope = 200%).