What this tool answers
You need a first-pass count and Working Load Limit for consumer ratchet straps before securing cargo on a trailer or truck bed. The calculator applies an FMCSA-style screen: aggregate WLL at least 50% of cargo weight, plus a minimum tiedown count by article length, then names the fewest straps on this site’s 3,333 / 4,000 lb ladder — or returns NO_MATCH.
Why 50% aggregate WLL
Under 49 CFR 393.106, the sum of the working load limits of all tiedowns used to secure an article must be at least half the weight of the article. This site uses that rule as a transparent shopping screen. It is not a substitute for the full cargo-securement regulations or a carrier’s written procedures.
Length-based minimum count
49 CFR 393.110 sets minimum tiedown numbers by article length: one tiedown when length is 5 ft or less and weight is 1,100 lb or less; two when length is 5 ft or less and weight is over 1,100 lb; two when length is over 5 ft through 10 ft; and two plus one additional tiedown for every 10 ft (or fraction) beyond 10 ft. The calculator takes the greater of that minimum and the count needed for aggregate WLL.
Indirect vs direct tiedowns
Mode 1 (indirect / over-the-top or around) credits 100% of each strap’s WLL toward aggregate. Mode 2 (direct / from anchor point to cargo) credits 50% of each strap’s WLL. Enter 1 or 2 in the form. Wrong mode understates or overstates how many straps you need.
WLL vs break strength
Shop by labeled Working Load Limit. Break strength (often printed larger on consumer packs) is typically about three times WLL and is not the number used for aggregate securement math. Confirm the live listing’s WLL before purchase.
When the answer is NO_MATCH
If more than eight straps of the 3,333 / 4,000 lb classes would be required, this site returns NO_MATCH. Split the load, use higher-rated tiedowns or chains, or redesign the securement plan — do not force undersized consumer ratchet straps.
Sources
FMCSA cargo securement rules summarized from 49 CFR 393.106 (aggregate WLL) and 393.110 (minimum number of tiedowns). VEVOR US ratchet-strap product pages for 3,333 and 4,000 lb WLL classes (HTTP 200, 2026-09-10). Not legal advice.