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About Shed Ramp Angle Calculator
Determine slope angle in degrees, percentage grade, slope ratio, and overall surface length for storage sheds, lawn mowers, ATV, and equipment ramps.
Inputs and calculations stay in your browser and require no signup.
How the calculation works
Planning calculation
Slope angle = arctan(rise ÷ run) in degrees; Slope percentage = (rise ÷ run) × 100; Ramp surface length = √(rise² + run²); Slope ratio = 1 : (run ÷ rise).
How to use this calculator
- 1Enter measured project dimensions and quantities.
- 2Adjust material, spacing, waste or density assumptions to match the project.
- 3Review the live planning quantities.
- 4Round purchasing quantities appropriately and confirm field conditions.
Understanding the result
A lower slope angle (under 12° to 15°) prevents lawn mower deck bottoming, equipment rollover, and slipping during wet conditions.
Results use the units shown beside each field and output.
Important limitations
- Pure geometric right-triangle calculation; does not certify ADA accessibility, structural load capacity, or local building code compliance.
- Safe ramp slope depends on equipment ground clearance, wheel wheelbase, surface traction, and weather conditions.
- Ramps steeper than 15° can be hazardous for heavy equipment and walking with loads.
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Frequently asked questions
What is a good slope angle for a shed ramp?
For riding lawn mowers and snowblowers, an angle of 10° to 15° (approximately a 1:4 to 1:6 ratio) is recommended to prevent mower deck scraping and slipping.
How long should a shed ramp be for a 12-inch rise?
For a 12-inch rise, a 48-inch run gives a 14° slope (1:4 ratio) with a 49.5-inch surface length. A 60-inch run gives an easier 11.3° slope (1:5 ratio) with a 61.2-inch ramp surface.
Is a shed ramp governed by ADA guidelines?
ADA requires 1:12 slope (4.76°) for pedestrian handicap ramps. Equipment utility ramps can be steeper but require sufficient deck clearance and traction.
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