LTL Linear Feet Calculator: How to Calculate & Avoid Capacity Charges
How to calculate linear feet for LTL freight, what triggers the 12-foot rule capacity charge, and how to use a free linear feet calculator before booking.
Linear feet is the most misunderstood billing concept in LTL shipping. A light, low-density shipment can get hit with a capacity surcharge simply because of how much floor space it takes up on the trailer. Understanding how to calculate it — and how to stay under the 12-foot threshold — saves money on every shipment.
⚡ Quick Formula
48×40 pallet, 40" facing trailer length:
1 row = 40" ÷ 12 = 3.33 ft → rounds to 4 linear feet
3 rows = 120" ÷ 12 = 10 ft → rounds to 12 linear feet — triggers surcharge ⚠
What Are Linear Feet in LTL Shipping?
Linear feet measure how much of a trailer's floor length your shipment occupies end to end. Unlike cubic volume or actual weight, linear feet only care about floor space in one direction: how far down the trailer your pallets extend.
The key rule: two pallets placed side by side in the same row count as one row. A 53-foot trailer is 99 inches wide — wide enough for two standard 48×40 pallets across (96 inches). So 2 pallets across = 1 row = the same linear footage as 1 pallet alone.
How to Calculate Linear Feet Step by Step
Linear Feet Reference Table — Standard 48×40 Pallets
| Pallets | Rows (2-wide) | Linear inches | Linear feet | 12-ft rule? |
|---|---|---|---|---|
| 1–2 | 1 | 40" | 4 ft | No ✓ |
| 3–4 | 2 | 80" | 8 ft | No ✓ |
| 5–6 | 3 | 120" | 12 ft ⚠ | Yes ⚠ |
| 7–8 | 4 | 160" | 16 ft | Yes ⚠ |
| 9–10 | 5 | 200" | 20 ft | Yes ⚠ |
| 26 (full) | 13 | 520" | 43 ft | FTL |
The 12-Foot Rule — What Triggers the Capacity Charge
Most LTL carriers apply a capacity surcharge when your shipment occupies 12 or more linear feet of trailer floor space. This is separate from freight class and actual weight — it applies purely based on floor space used.
The surcharge is typically calculated one of two ways depending on the carrier:
- Linear foot pricing: A flat rate per linear foot multiplied by total feet used. Example: $35/linear foot × 14 feet = $490 capacity charge.
- Volume rate: The shipment is priced as a percentage of a truckload rate rather than per-pallet LTL pricing. Often cheaper for large shipments but calculated differently.
Real cost example
How to Avoid the 12-Foot Rule Surcharge
- Stack your pallets. Double-stacking halves floor space. Two 48" layers = 96" total, fits under a standard 110" interior ceiling.
- Consolidate onto fewer pallets. Three pallets taking 3 rows can sometimes become two pallets taking 2 rows.
- Stay at 4 pallets or under. The safe zone is 2 rows (4 pallets) = 8 linear feet — 4 feet clear of the threshold.
- Compare volume LTL pricing. Above 16–18 linear feet, volume pricing often beats standard LTL plus surcharge.
- Calculate before you book. Use the load planner before calling the carrier. Knowing your linear footage gives you leverage and avoids surprise invoices.
Calculate Your Linear Feet Now
Enter pallet dimensions and count — see linear feet, 12-foot threshold, and visual trailer floor plan instantly.
Open Free LTL Load Planner →Frequently Asked Questions
How do I calculate linear feet for LTL freight?
Rows = total pallets ÷ pallets per row. Linear feet = rows × pallet depth in inches ÷ 12. For 6 pallets 2-wide: 3 rows × 40" ÷ 12 = 10 ft → rounds to 12 linear feet. Use the free load planner to calculate automatically.
What is the 12-foot rule in LTL shipping?
When your LTL shipment occupies 12 or more linear feet of trailer floor space, most carriers apply a capacity surcharge regardless of actual weight. Three rows of standard 48×40 pallets (6 pallets) reaches exactly 12 linear feet and triggers this charge.
How many pallets is 12 linear feet?
Six standard 48×40 pallets in 3 rows of 2 = 12 linear feet. Five pallets arranged as 3 rows (2+2+1) also equals 12 linear feet because the third row still takes 40 inches of floor space even with only 1 pallet across.
What is a linear feet calculator for freight?
A linear feet calculator works out how much of a trailer's floor length your shipment occupies based on pallet dimensions and count. The CargoTools load planner calculates linear feet and shows the 12-foot threshold visually — free, no signup.
How do I avoid the LTL linear foot rule surcharge?
Stack pallets to halve floor space. Consolidate onto fewer pallets. Stay under 4 pallets (8 linear feet) where possible. Above 12 feet, compare standard LTL plus surcharge against volume LTL pricing — volume often wins above 16 linear feet.