Trailer Fill Calculator & Linear Foot Estimator
Determine trailer cubic fill %, floor space usage, linear feet utilized, and avoid costly LTL Linear Foot Rule (NMFC Item 110) penalties.
Standard US long-haul trailer. Fits 26 straight or 30 turned pallets single-stacked.
What is the LTL Linear Foot Rule (NMFC Item 110 / Capacity Rule)?
In Less-Than-Truckload (LTL) shipping, carriers bill shipments primarily based on weight and freight class. However, because trailer floor space is limited, carriers enforce a strict Linear Foot Rule (often item 110 or individual carrier rules tariffs):
If a single LTL shipment occupies 12 to 14 linear feet or more, it typically voids standard discount pricing and triggers Volume LTL or Exclusive Use minimum billing.
Shipments exceeding 750 cubic feet with low density (under 6 PCF) are subject to artificial minimum billing weights (e.g. 1,000 lbs per linear foot).
Turn pallets sideways (pinwheel loading) to minimize linear feet, or request a Volume LTL / Partial Truckload (PTL) quote up-front to lock in lower rates.
How to Fit 30 Pallets in a 53ft Trailer (Straight vs. Turned Loading)
Standard GMA pallets measure 48 inches long by 40 inches wide. Because modern 53-foot dry van trailers have an interior width of 100 to 102 inches, loaders can orient pallets in two distinct ways:
Straight Loading (26 Pallets Max)
Pallets loaded with the 40-inch side across the trailer width and the 48-inch side along the trailer length:
- 2 rows of 13 pallets = 26 pallets total.
- Total linear feet required: 52.0 feet (624 inches).
- Leaves only 0.5 feet of clearance at the rear doors.
Turned / Wide Loading (30 Pallets Max)
Pallets turned 90 degrees so the 48-inch side spans across trailer width (2 × 48" = 96" ≤ 100"):
- 2 rows of 15 pallets = 30 pallets total (+4 extra pallets!).
- Total linear feet required: 50.0 feet (600 inches).
- Saves 2 full linear feet while fitting 15% more cargo!
US Federal Axle Weight Limits & Bridge Formula Reference
Under federal law, standard 5-axle commercial semi-trucks are restricted to an 80,000 lbs Gross Combined Vehicle Weight (GCVW) with strict individual axle maximums:
| Axle Group | Max Legal Weight | Location | How to Adjust Overweight Axle |
|---|---|---|---|
| Steer Axle | 12,000 lbs | Front axle under tractor engine | Slide 5th wheel plate rearward |
| Drive Tandem Axles | 34,000 lbs | Dual axles under tractor cab | Slide trailer tandems forward or shift freight rearward |
| Trailer Tandem Axles | 34,000 lbs | Dual axles under rear of trailer | Slide trailer tandems rearward or shift freight forward |
| Gross Combined (GCVW) | 80,000 lbs | Total Tractor + Trailer + Cargo | Requires reducing cargo or overweight DOT permits |
Trailer Fill & Linear Foot FAQs
How is linear footage calculated on an LTL shipment?
Linear feet is the amount of trailer length your freight occupies from front to back. If pallets take up both sides of the trailer width (2 across), linear feet equals the length of each row multiplied by the number of rows divided by 12. For 4 standard GMA pallets loaded straight (2 rows of 2 pallets), the linear footage is (2 × 48") / 12 = 8 linear feet.
What is the difference between Single-Stacked and Double-Stacked pallets?
Single-stacked pallets sit directly on the trailer floor. Double-stacking places one pallet on top of another. To double-stack safely, the combined height must be at least 4 inches less than the trailer's interior ceiling (typically under 52 inches per pallet in a 110" trailer), the cargo must be rigid and level, and the total weight must not exceed axle ratings.
Can I turn pallets in a 40ft ocean container?
No, standard 40ft and 20ft ocean containers have an interior width of approximately 92 inches (234 cm). Because two turned 48-inch pallets require 96 inches of width, they cannot fit side-by-side turned. Ocean containers must be loaded straight (40" wide side by side = 80" ≤ 92") or pinwheeled (one straight 40" + one turned 48" = 88" ≤ 92").
Federal Highway & Trailer Capacity Standards
Dry van interior dimensions, axle load distribution, and maximum allowable gross vehicle weights (GVWR 80,000 lbs) comply with statutory guidelines issued by the Federal Highway Administration (FHWA 23 CFR Part 658) and cargo securement standards under the FMCSA (49 CFR Part 393) .