Shed ramp planning
Shed Ramp Slope Calculator
Find a practical ramp length for a shed, garage, mower shed, or small outbuilding. Enter the rise from ground to floor, choose a slope ratio such as 6:1, 8:1, or 12:1, then estimate angle, surface length, plywood sheets, traction cleats, and project cost.
How to use the shed ramp calculator
- Measure the rise from the ground or landing surface to the finished shed floor.
- Choose a slope ratio. Larger ratios create longer, gentler ramps.
- Enter the ramp width you want for your mower, cart, bins, or doorway.
- Adjust sheet cost, cleat spacing, and waste allowance for a quick buying estimate.
For lawn mowers and carts, a ramp that is a little longer than the bare minimum is often easier to use. Leave room for the door swing, add a firm landing at the bottom, and use a textured surface for traction in wet weather.
Shed ramp length examples
If your shed floor is 12 inches above the ground, a 6:1 ramp needs about 6 feet of horizontal run, an 8:1 ramp needs about 8 feet, and a 12:1 ramp needs about 12 feet. A riding mower, wheelbarrow, or loaded cart usually feels better on the longer option if your yard has room.
For an 18 inch rise, the same ratios become about 9 feet, 12 feet, and 18 feet of run. Use the calculator above to check your exact rise, width, surface length, and material estimate before buying lumber.
Shed ramp slope ratio guide
Use 6:1 when space is tight and the ramp only needs light use. Use 8:1 for many mower shed ramps and garden carts. Use 10:1 or 12:1 when you want a gentler slope, heavier equipment feels hard to push, or wet traction is a concern.
Before building, test whether the mower deck, cart wheels, or snow blower will clear the threshold. A slightly longer ramp with a flat landing is usually easier and safer than the shortest ramp that fits.
Shed ramp FAQ
What does an 8:1 shed ramp slope mean?
An 8:1 slope means the ramp runs 8 inches horizontally for every 1 inch of vertical rise. A 12 inch rise at 8:1 needs 96 inches, or 8 feet, of horizontal run.
How wide should a shed ramp be?
Many shed ramps are 36 to 60 inches wide. Measure your doorway and the widest item you plan to move, then leave comfortable side clearance.
How long should a shed ramp be for a 12 inch rise?
For a 12 inch rise, an 8:1 shed ramp needs about 8 feet of horizontal run. A compact 6:1 ramp needs about 6 feet, while a gentler 12:1 ramp needs about 12 feet plus any landing space.
Can this calculator be used for wheelchair ramps?
It can show the math for a 12:1 or gentler slope, but accessibility ramps have specific landing, handrail, edge protection, width, and surface requirements. Check the rules that apply to your location and project.
What is the best shed ramp slope ratio for a mower?
An 8:1 to 12:1 slope is a common planning range for mower shed ramps when space allows. Shorter 6:1 ramps can work, but they are steeper and need good traction plus enough deck clearance.