DOT Cargo Securement Calculator

Aggregate Working Load Limit (WLL) & Tiedown Checker

1. Cargo Details

Used to determine the minimum number of tiedowns required.

2. Tiedowns

List all tiedowns securing this cargo. Indirect (over the cargo) counts as 100% of WLL. Direct (attached to cargo) counts as 50% of WLL.

Compliance Report

Aggregate WLL Requirement
0 / 0 lbs
Required: 50% of cargo weight
PENDING
Minimum Tiedowns Requirement
0 / 0 tiedowns
Based on article length and weight
PENDING
Awaiting Inputs

About the DOT Cargo Securement WLL Calculator

Freight haulers and flatbed drivers ensure absolute highway safety with our DOT cargo securement calculator. Quickly aggregate the Working Load Limit (WLL) of your straps and chains to guarantee they cover at least 50% of your cargo's total weight. Determine the exact minimum number of tiedowns required based on cargo length, weight, and the presence of a bulkhead, keeping you compliant with stringent 49 CFR 393 regulations.

How it works

  1. Input the total weight and the overall length of the cargo being transported.
  2. Indicate whether the cargo is positioned against a compliant front-end structure or bulkhead.
  3. Add the specific Working Load Limits (WLL) for each strap, chain, or tensioner used in the securement system.
  4. Verify that the aggregate WLL exceeds 50% of the cargo weight and meets the minimum tiedown count.

Frequently asked questions

What is the aggregate WLL requirement for cargo securement?

According to FMCSA regulations, the aggregate working load limit of all tiedowns used to secure an article against movement must be at least one-half (50%) of the total weight of the article being secured.

How does cargo length affect the number of tiedowns?

Generally, you need one tiedown for articles 5 feet or shorter and under 1,100 lbs. You need two tiedowns for articles 5 feet or shorter weighing over 1,100 lbs, or any article between 5 and 10 feet long. Add one tiedown for every additional 10 feet.

How is the Working Load Limit (WLL) determined?

The WLL is assigned by the manufacturer and is often marked directly on the strap or chain. If an unmarked component is used, DOT regulations assign it a default, drastically reduced WLL based on its size and type.

What happens if the tiedowns are attached to different anchor points?

When a tiedown goes over the cargo and attaches to both sides of the trailer, its full WLL is counted. If it attaches to the cargo itself and only one side of the trailer, only half of its WLL is counted toward the aggregate total.

References