SettingsSettings for this calculationUS
The vertical height the ramp needs to climb — e.g. trailer bed height off the ground.
Measure from the ground to the top of the loading surface.
The steepest slope you want the ramp to have.
15% is a commonly cited comfortable maximum for wheeled equipment ramps; heavier or lower-clearance equipment may need a gentler ramp (10% or less) to avoid bottoming out or struggling for traction.
Minimum ramp length
10.1 ft (minimum length)
This is a straight-line ramp length based on grade alone — also check your specific equipment's ground clearance and approach/departure angle limits, which can require an even longer or hinged ramp regardless of grade.
- Horizontal run needed on the ground
- 10 ft
- Rise being climbed
- 1.5 ft
They open the calculator with your figures already in it
Trailer Ramp Length Calculator: 10.11 ft (minimum length) — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Horizontal run = rise height / (maximum grade percent / 100) — the same rise/run relationship used in the Slope & Grade Calculator
- Ramp length = the hypotenuse over that rise and run, sqrt(rise^2 + run^2), because the ramp is the sloping member rather than its footprint
Inputs used
- Rise Height
- 1.5 ft
- Maximum Safe Grade (%)
- 15
Intermediate steps
- Horizontal run needed on the ground
- 10 ft
- Rise being climbed
- 1.5 ft
Confidence note: This is a straight-line ramp length based on grade alone — also check your specific equipment's ground clearance and approach/departure angle limits, which can require an even longer or hinged ramp regardless of grade.
What this calculation does not cover
- The headline is the sloping face measured end to end — the plank you buy — while the horizontal run beside it is the ground the ramp reaches back across. They are different questions and the run is always the smaller of the two, so read the length when you are cutting material and the run when you are checking whether the space behind the trailer is deep enough.
- Only rise and grade are asked for, so nothing here tests the ramp itself: load weight, plank material, span between supports and rated capacity play no part, and a ramp long enough to hit your grade target can still be badly under-rated for whatever is about to drive up it.
- The length spans the rise and nothing else, so the overlap that hooks over the tailgate or bed lip and the flat footprint the bottom end needs to bear on is extra, added after this number rather than inside it.
- A single constant slope is applied across the whole run, so an arched ramp, steeper at its ends than its average, can satisfy the maximum you entered on paper while exceeding it exactly where the wheels start to climb.
- Rise Height is treated as one fixed measurement taken before loading, and it does not follow the bed settling as weight transfers onto it, a hitched or unhitched tow vehicle changing that height, or a ramp foot standing on ground that falls away from the trailer.
- The grade field accepts 5% to 30% only and the rise stops at 3 m (about 10 ft), so gentler ramps for very low-clearance machines and dock-height rises above that cap fall outside what the tool will take.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-05 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations2
- Horizontal run = rise height / (maximum grade percent / 100) — the same rise/run relationship used in the Slope & Grade Calculator
- Ramp length = the hypotenuse over that rise and run, sqrt(rise^2 + run^2), because the ramp is the sloping member rather than its footprint
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