The LTL capacity charge is one of the most expensive and least understood surcharges in freight shipping. It shows up on your invoice as a "capacity load" or "exceeds linear feet" fee — and it can increase your freight bill by 50 to 150% with no warning.
The frustrating part? It's completely avoidable once you understand the two rules that trigger it: the linear foot rule and the cubic capacity rule.
Real Invoice Example
Shipment: 7 pallets (48×40×48"), 2,100 lbs, Chicago to Atlanta
Quoted at: Class 70 • Estimated cost: $520
Carrier billed at: Capacity load — 14 linear feet × 1,000 lbs = 14,000 lbs at Class 125
Final invoice: $1,340
Unexpected charge: $820 (158% over quote)
What Is an LTL Capacity Charge?
When you ship LTL (Less-Than-Truckload), you're sharing a 53-foot trailer with other shippers' freight. Carriers price LTL based on the assumption that they can fill the trailer efficiently. When your shipment is too large, too light, or occupies too much floor space relative to its weight, you've broken that efficiency — and the carrier charges you for it.
There are two distinct rules that can trigger a capacity charge, and they work differently:
Rule 1: The Linear Foot Rule (12-Foot Rule)
Linear feet measure how much of the trailer floor your shipment occupies from front to back. A standard 53-foot trailer is 98 inches wide — enough for two standard 40-inch pallets placed side by side, with a few inches to spare.
The linear foot rule varies by carrier, but most major carriers (XPO, Old Dominion, Estes, Saia) trigger it at 10 to 12 linear feet. Once exceeded, the carrier re-rates your shipment at 1,000 lbs per linear foot regardless of actual weight.
How to Calculate Linear Feet
Standard 40" pallets load 2 across the trailer. Each row = 4 linear feet.
⚠️ Critical trap: Most carriers calculate linear feet assuming pallets are floor-stacked, not double-stacked, even if you mark them stackable. A 7th pallet doesn't just add 10% more cost — it can double your bill.
Linear Foot Rule by Major Carrier
| Carrier | Linear Foot Threshold | Rate Applied |
|---|---|---|
| Old Dominion (ODW) | 10 linear feet | 1,000 lbs/linear ft |
| XPO Logistics | 12 linear feet | 1,000 lbs/linear ft |
| Estes Express | 12 linear feet | 1,000 lbs/linear ft |
| Saia | 12 linear feet | 1,000 lbs/linear ft |
| ABF Freight | 15 linear feet | Volume rates apply |
| Dayton Freight | 15 linear feet + <22.5 PCF | 1,250 lbs/linear ft |
Thresholds vary by contract and are subject to change. Always verify with your carrier's rules tariff.
Rule 2: The Cubic Capacity Rule (750 & 6 Rule)
The cubic capacity rule is separate from the linear foot rule and catches a different type of shipment: freight that is light relative to the space it occupies. Most carriers apply it when both of these conditions are met:
- Total cubic feet exceeds 750 cu ft (some carriers trigger at 350-500 cu ft)
- Density is below 6 PCF (some carriers use 4 PCF as the threshold)
When triggered, the carrier re-calculates weight at 6 lbs per cubic foot across your entire shipment volume — regardless of actual weight. The shipment is then rated at a minimum freight class, usually Class 125.
Cubic Capacity Example
Shipment: 10 pallets of foam cushions (48×40×60")
Actual weight: 800 lbs total
Volume: 10 × (48×40×60) / 1,728 = 833 cu ft
Density: 800 lbs ÷ 833 cu ft = 0.96 PCF (well below 6 PCF)
Carrier re-rates at: 833 cu ft × 6 lbs = 4,998 lbs at Class 125
Result: Billed for 6× your actual weight
How to Avoid LTL Capacity Charges
1. Calculate Linear Feet Before You Book
The single most effective thing you can do is calculate your linear footage before calling a carrier. Use our free LTL Load Planner — it shows your exact pallet layout in a 53-foot trailer, flags the 12-foot threshold in real time, and tells you immediately whether your shipment triggers a capacity charge.
Check Your Linear Feet Before Booking
Visual 53ft trailer layout. 12-foot rule warning built in. Free, instant.
Launch Free Load Planner →2. Stay Under the Threshold — Split the Shipment
If your shipment is 7 pallets and the threshold is 6, splitting into two separate shipments (4 + 3) is often cheaper than paying the capacity fee — even accounting for two pickup charges. Run the numbers before you assume consolidation saves money.
3. Increase Density, Not Pallet Count
If you're near the cubic capacity threshold, think about how to ship denser. Can product be stacked higher on fewer pallets instead of spread across more? Denser pallets mean fewer pallets, fewer linear feet, and higher PCF density — all moving in the right direction.
4. Use Turnable Pallets Where Possible
If your pallets are 48×40 and can be loaded with the 40-inch side facing forward, each row only uses 40 inches (3.33 ft) instead of 48 inches (4 ft). For a 6-pallet shipment that's 10 linear feet instead of 12 — just under the threshold at many carriers.
💡 The turnable trick: Most carriers let you declare pallets as "turnable" on the BOL. If the 40-inch side loads forward, your linear footage drops by 17% — potentially keeping you under threshold.
5. Consider Volume LTL or Partial TL
Shipments between 6 and 12 pallets often fall into the gap where LTL capacity charges make standard LTL uneconomical. Volume LTL (VLTL) and partial truckload (PTL) pricing exist exactly for this range — they charge by space used rather than triggering punitive per-foot rates.
6. Know Your Carrier's Specific Rules
Threshold rules vary significantly by carrier — Old Dominion triggers at 10 linear feet, ABF at 15. If you're regularly shipping 5-8 pallets, choose a carrier whose threshold gives you the most headroom. A 3PL with multi-carrier contracts can often route around capacity charges entirely.
The Stackable vs. Non-Stackable Trap
Both rules are dramatically affected by whether freight is stackable or not. As covered in our re-weigh charges guide, carriers assume non-stackable freight occupies 96 inches of vertical space regardless of actual height. This means:
- A 48-inch-tall non-stackable pallet is measured as 96 inches for cubic footage
- Your cubic footage doubles, cutting density in half
- You hit the 750 cu ft cubic capacity threshold twice as fast
Proper packaging that allows stacking is often worth more than the cost of the extra packaging materials.