Calculate slope grades, angles, and ratios with our easy-to-use calculator. This tool is essential for construction, landscaping, engineering projects, and more.
Nearly level (0%)
Ideal for most construction projects, sports fields
ADA Compliant
This slope meets ADA requirements for wheelchair ramps (max 8.33%)
Vehicle Access
This slope is suitable for most vehicles
Slope is typically expressed as a ratio of rise to run (y/x) in mathematics, while grade is usually expressed as a percentage in engineering and construction. Both describe the steepness of a line or surface.
Our slope grade calculator is designed to help you convert between different measurements of slope: angles, percentages, and ratios. Here's how to use each calculator mode:
1. Enter an angle in degrees or use the slider to select a value
2. The calculator will automatically convert this to a grade percentage and ratio
3. The visual indicator shows the steepness of the slope
1. Enter a grade percentage or use the slider to select a value
2. The calculator will automatically convert this to an angle in degrees and a ratio
3. The visual indicator shows the steepness of the slope
1. Choose between "Rise over Run" (y/x) or "Run over Rise" (x/y) format
2. Enter values for the run (x) and rise (y)
3. The calculator will convert this to grade percentage, angle, and ratio
Maximum 8.33% grade (1:12 ratio)
Typically 10-15% grade
Maximum 6-8% grade (varies by location)
Up to 10-15% grade
Typically 16.7-100% (4:12 to 12:12 ratio)