Every ramp supplier, us included, has a number on a slide: forty containers a day, sixty moves an hour, a trailer turned in twenty minutes. None of those numbers survive contact with a receiving dock that has one forklift, 12 m of staging space and a checker who is also answering the phone.
This is not an argument against measuring throughput. It is an argument about what to measure. A ramp is a fixed piece of steel with a fixed grade and a fixed deck width. It sets the upper bound on how fast a forklift can get in and out of a trailer, and then labour, staging and the door decide what you actually get. So the useful question is not “how many containers per hour does this ramp do” but “which of my three clocks is running long, and does the ramp touch it”.
The number nobody defines: containers per hour
Three different clocks run on every container, and suppliers quote whichever one flatters them.
The first is door occupancy: from the trailer backing against the bumpers to the doors closing on an empty box. This is the number the driver experiences and the number detention is calculated against.
The second is net handling time: from the first pallet leaving the container to the last one coming out. This is the number a forklift and a ramp can influence directly.
The third is gate-to-gate: arrival at the site to the empty container leaving. This is the only number a 3PL can invoice against, and it includes the queue, the paperwork and the yard move.
Published benchmarks sit at the door-occupancy level, which is why they look modest. For a palletized 40 ft container, market norms are 45 to 90 minutes with one forklift and one checker. For a floor-loaded 40 ft high cube carrying 2,500 to 3,000 cartons, the norm is three to six hours with a crew of two to four. Both figures are door occupancy, not net handling, and both assume staging space exists.
One container, measured in nine steps
Here is where the 45 to 90 minutes goes on a palletized box. The numbers below are a working estimate for a 40 ft container with 20 pallets, one 2.5 to 3 t forklift and staging within 15 m of the door. They are arithmetic, not a claim about your site, but they match the published ranges closely enough to be useful for planning.
| Step | Time | What actually eats it |
|---|---|---|
| Break seal, open doors, first look inside | 3–5 min | Rusted locking bars, damaged seal, a load that has shifted against the door |
| Remove bracing, straps and dunnage | 5–20 min | Airbags and timber bracing at both ends; slip-sheet loads with no pallets at all |
| Forklift extraction, 20 pallets | 20–30 min | 60 to 90 seconds per round trip over 12 m of container plus the ramp |
| Count and scan against the packing list | 10–20 min | Mixed SKUs, missing SSCC labels, a packing list that does not match the load |
| Sweep, photograph, close and seal | 5 min | Damage documentation for the claim file |
| Total door occupancy | 43–80 min | Published market range: 45–90 min |
Look at the split. The forklift is doing real work for 20 to 30 minutes of an hour-long visit. The other half is preparation, counting and paperwork, and no ramp on earth shortens those. When a buyer tells us their ramp is slow, the honest answer is usually that the ramp is not the constraint: the container arrived with airbags and no advance packing list.
Palletized and floor-loaded are two different businesses
The single biggest variable in ramp throughput is not the ramp. It is whether the supplier palletized the load. The gap is roughly six-fold, and it changes the equipment decision.
| Metric | Palletized 40 ft | Floor-loaded 40 ft HC |
|---|---|---|
| Units inside | 20–24 pallets | 2,500–3,000 cartons |
| Crew | 1 forklift + 1 checker | 2–4 hand loaders |
| Door occupancy | 45–90 min | 3–6 hours |
| Containers per 8-hour shift, one ramp | 6–9 | 1–2 |
| Devanning price, US port markets | USD 350–750 | USD 700–1,600 |
| What the ramp contributes | Decisive: it is the only way in | Marginal: the crew may work from the ground with a conveyor |
That last row matters commercially. A yard ramp sells on palletized or slip-sheet freight, where a forklift physically has to reach the container floor at 1,200 to 1,500 mm. On hand-bombed cartons the ramp helps, but a telescopic conveyor and two loaders will often beat a forklift that has to reverse 12 m for every pallet.
Grade costs seconds you can actually measure
Ramp length and deck height set the grade, and grade sets how fast a laden forklift can safely move. There is no single legal limit for a mobile yard ramp the way EN 1398’s 12.5% applies to dock levellers, but there is a hard operational line at 10%: OSHA 29 CFR 1910.178(n)(7)(i) requires a loaded forklift on a grade steeper than 10% to travel with the load uphill, and (n)(11) requires the dockboard or bridgeplate to be secured before it is driven over.
| Ramp length | Rise to deck | Grade | Angle | Typical use |
|---|---|---|---|---|
| 7,570 mm / 24’10” | 1,200 mm / 47 in | 15.9% | 9.0° | Low trailer decks, 20 ft containers |
| 10,300 mm / 33’10” | 1,500 mm / 59 in | 14.6% | 8.3° | Standard 10 t hydraulic yard ramp |
| 11,400 mm / 37’5″ | 1,500 mm / 59 in | 13.2% | 7.5° | Longer deck, gentler entry for small-wheel trucks |
| 13,000 mm / 42’8″ | 1,500 mm / 59 in | 11.5% | 6.6° | Heavy or high-cube fleet, 3 t forklifts |
| 15,000 mm / 49’3″ | 1,500 mm / 59 in | 10.0% | 5.7° | The 10% threshold, load-uphill still prudent |
| 18,000 mm / 59’1″ | 1,500 mm / 59 in | 8.3% | 4.8° | Long-span or two-section ramp |
Read the table backwards and the design compromise becomes obvious. To reach a 1,500 mm deck at 8% you need 18 m of steel; at 15% you need 10 m. Most buyers take the shorter ramp because it fits the apron and moves between sites, then discover the cost: on a 15% grade a laden 3 t forklift creeps, and each of the 20 round trips in a container loses a few seconds. Twenty trips times five seconds is under two minutes. It is real, but it is not the reason a door is running late.
The queue forms behind the door, not on the ramp
This is where the money is, and it is measurable from public data. ATRI’s 2026 Analysis of the Operational Costs of Trucking puts average dwell at shipper and receiver facilities at 1 hour 49 minutes per stop in 2025, up from 1 hour 38 minutes the year before, and puts the average cost of operating a truck at USD 106.69 per hour with fuel. ATRI’s detention work has also found that roughly one stop in ten runs past two hours.
Run the arithmetic on a receiving door that handles 12 trucks a day. If 40 minutes of each visit is queueing rather than loading, that is eight truck-hours a day, or about USD 850 a day of carrier cost created by your dock. You do not pay all of it, and most carriers only collect a fraction of what they bill, but you pay some of it in detention invoices, and you pay the rest in appointment slots that drivers stop accepting.
A ramp can shorten that queue in exactly one situation: when the queue exists because there are not enough doors or not enough loading positions for the peak hour. It cannot help when the queue exists because the same forklift is serving three doors.
How to measure your own site in one shift
You do not need a WMS report. You need a stopwatch and three containers. Pick a normal shift, not a quiet one, and record four timestamps per container: trailer against the bumpers, first pallet out, last pallet out, doors closed. Write the crew size and the container type next to each.
That gives three ratios. Net handling rate is pallets divided by the time between first and last pallet, which tells you the forklift’s real cycle. Door occupancy is the total span, which tells you what the driver waits for. The ratio of net handling to door occupancy tells you where to spend money: above 0.6 and the forklift or the ramp is the constraint, below 0.4 and it is preparation, counting or paperwork.
Then convert to capacity. Containers per ramp per shift equals productive hours divided by door occupancy. An 8-hour shift with 85% availability is 6.8 productive hours, so a 60-minute average gives 6.8 containers and a 45-minute average gives 9. Those are the only two numbers worth arguing about with a supplier.
What the ramp actually costs per container
Once throughput is measured, the capital question gets much smaller than buyers expect. Take a 10 t hydraulic yard ramp at a guidance price of USD 9,800 to 12,500 EXW, amortised over five years, 250 working days and two shifts a day.
| Item | Value |
|---|---|
| Ramp, 10 t hydraulic, EXW guidance | USD 9,800–12,500 |
| Shifts over 5 years (250 days × 2) | 2,500 |
| Capital cost per shift | USD 3.90–5.00 |
| Containers per shift, palletized | 6–9 |
| Capital cost per container | USD 0.45–0.85 |
Under a dollar a container. The ramp is not the expensive part of your dock; the hourly cost of the crew standing next to it is. That is the argument for buying the right ramp once rather than the cheapest one twice, and it is also the argument against buying a second ramp to solve a labour problem.
Where a second ramp is the wrong answer
We sell ramps, so treat this with appropriate suspicion, but the honest list of cases where a second ramp does not add throughput is longer than most sales pages admit.
If one forklift serves two doors, a second ramp simply gives the forklift a longer walk. If the staging lane is shorter than the container, the forklift spends its time shuffling pallets instead of extracting them. If the receiving count happens at the door rather than in a staging area, every container pays the counting time twice. If the apron slopes away from the building, a ramp that looks level on the drawing will not be level in service, and the grade you calculated is not the grade the forklift climbs.
The cases where a second ramp does pay are narrower and more specific: two forklifts and one door in a peak season, a second shift running in parallel, or a site where the second ramp replaces a daily trailer shuffle between two buildings. In those cases the payback is usually measured in months rather than years, because the alternative is a concrete project with a lead time measured in seasons.
Questions we get about ramp throughput
How many containers can one yard ramp handle per day?
Six to nine palletized containers per 8-hour shift with one forklift, one checker and staging within 15 m of the door; one to two floor-loaded containers per shift. Across two shifts that is 12 to 18 containers a day, and the crew and the door usually cap it before the ramp does.
Does a steeper ramp really slow loading down?
Yes, but less than most people assume. On a 15% grade a laden forklift moves slower and brakes earlier; measured over 20 pallets the loss is usually one to three minutes per container. Grade matters more for safety and tyre wear than for throughput.
Is containers per hour a fair way to compare ramps?
No. The ramp sets access, not rate. Compare ramps on rated dynamic capacity, usable deck width, side plate and approach geometry, then compare suppliers on whether they will size the ramp to your fleet’s deck heights. A throughput claim without a stated crew size, container type and staging distance is marketing.
What is a realistic devanning time for a 40 ft container?
45 to 90 minutes for palletized freight and three to six hours for a floor-loaded high cube, both measured as door occupancy with a competent crew. Published US devanning prices track that split closely: roughly USD 350 to 750 for palletized and USD 700 to 1,600 for floor-loaded.
If you want the second opinion before you buy, send us three numbers: your trailer deck heights, your heaviest laden forklift move and the distance from the door to your staging lane. We will tell you what throughput to expect, and whether the ramp or the layout is your constraint. Contact our engineering team for a specification review, or start from the mobile yard ramp range and the 10 t standard hydraulic model. For ground-level container work without a dock, the container ramp is the shorter, cheaper entry point, and the ground-to-dock ramps cover the fixed-position case.
