• “CWT” (hundredweight) is a legacy unit for pricing/weighting some commodities and freight.
– In the U.S. and Canada 1 CWT = 100 lb = 45.359237 kg (often rounded to 45.4 kg).
– In the U.K. (and historically in imperial usage) 1 CWT = 112 lb = 50.802345 kg (often rounded to 50.8 kg).
– Use CWT = weight in pounds ÷ 100 (U.S.) or ÷ 112 (U.K.). For freight, carriers quote a $/CWT rate; shipment cost = CWT × rate (+ fees).
What is a hundredweight (CWT)?
– CWT stands for centum/cental weight — literally “hundredweight.” It’s used for some agricultural commodities (especially livestock in the U.S.) and as a pricing unit for freight shipments that are less-than-truckload by weight.
– Two standard definitions exist: the North American “short” hundredweight (100 lb) and the British “long” hundredweight (112 lb).
Historical note (brief)
– The hundredweight dates from medieval avoirdupois weight practices. After Edward III set the stone at 14 lb (so 8 stones = 112 lb), the British hundredweight became 112 lb in law (1878). The U.S./Canada uses 100 lb. This duality is a common source of confusion in international trade.
Exact conversions
– 1 US CWT = 100 lb = 100 × 0.45359237 kg = 45.359237 kg (≈ 45.4 kg).
– 1 UK CWT = 112 lb = 112 × 0.45359237 kg = 50.802345 kg (≈ 50.8 kg).
– 20 US CWT = 1 short ton (2,000 lb). 20 UK CWT = 1 long ton (2,240 lb).
How to calculate CWT (step-by-step)
1. Weigh the item(s) to get total gross weight in pounds (lb).
2. Decide which CWT you’re using:
• U.S. market → use 100 lb per CWT.
• U.K./imperial context → use 112 lb per CWT.
3. Compute: CWT = total pounds ÷ (100 or 112).
4. If pricing applies, multiply CWT × quoted $/CWT rate. Add any minimums or accessorial charges.
Example 1 — simple math
– Shipment = 500 lb; rate = $30 per CWT (U.S. basis)
– CWT = 500 ÷ 100 = 5
– Price = 5 × $30 = $150 (plus any surcharges or minimums)
Cattle and livestock: how CWT is used and calculated
– In U.S. livestock markets, prices are often quoted in $ per CWT (e.g., $120 per cwt). That quote usually applies to carcass (dressed) weight, not always live weight — check contract terms.
– Typical way to compute payment from live animals:
1. Obtain live weight (lbs).
2. Estimate dressing percentage (typical beef dressing % ≈ 55–65%; fed cattle often ~62% — use the actual or contract percentage).
3. Carcass weight (hot carcass weight, HCW) = live weight × dressing %.
4. CWT of carcass = HCW ÷ 100 (U.S.) or ÷ 112 (if imperial).
5. Payment = CWT × $/CWT (plus any premiums/deductions).
Cattle example
– Live weight = 1,200 lb; dressing % = 62%; price = $140 per cwt (carcass basis)
– HCW = 1,200 × 0.62 = 744 lb
– CWT = 744 ÷ 100 = 7.44 cwt
– Payment = 7.44 × $140 = $1,041.60
Freight pricing: how carriers calculate charges with CWT
– Many parcel/LTL carriers offer hundredweight pricing for small shipments that add up to less-than-truckload (but heavier than single packages). Basic steps:
1. Determine gross shipment weight (lbs). Some carriers use maximum of actual weight and dimensional (volumetric) weight for billing.
2. Convert to CWT: CWT = lbs ÷ 100 (U.S.).
3. Apply carrier’s $/CWT rate.
4. Enforce any minimum charge (carriers often have a minimum $ charge or minimum CWT) and add surcharges (fuel, residential, liftgate, loading/unloading, etc.).
– Example: 650 lb, carrier rate $22/CWT, minimum $75
• CWT = 650 ÷ 100 = 6.5
• Base = 6.5 × $22 = $143
• Final = $143 (if above minimum) + surcharges
CWT vs LTL — when to use which
– CWT pricing: best for many small shipments to many destinations or shipments that are lighter and billed primarily by weight. Pros: simple, good for frequent small loads; Cons: may not account for pallet dimensions/handling complexity.
– LTL pricing: more appropriate for larger heavy shipments that occupy pallets; price factors include actual weight, freight class (density, liability, stowability), distance, and accessorials. Pros: handles palletized freight and dense items better; Cons: more complex quoting.
– Practical rule: if your shipment is palletized, heavier, or needs special handling, check LTL quotes; if you have many small, similar-weight shipments, CWT pricing can be simpler and cheaper.
Practical checklist for shippers and buyers
– Always confirm which CWT definition is intended (U.S. 100 lb vs U.K. 112 lb). Spell it out on contracts.
– For international trade, convert to kilograms to avoid ambiguity and align with metric customs practices.
– For livestock: know whether prices are live-weight or carcass-weight based and the dressing percentage used in settlement.
– For freight: request full quote details — rate per CWT, minimum charge, dimensional weight rules, fuel surcharge, accessorials, and transit times.
– Keep a simple spreadsheet or calculator with formulas:
• CWT_US = lb_total ÷ 100
• CWT_UK = lb_total ÷ 112
• cost = CWT × rate + surcharges
Explain Like I’m Five (ELI5)
– Imagine you count apples in baskets. Instead of counting every apple, you say “one basket” equals 100 apples in America, but in Britain one basket equals 112 apples. When someone charges you by “basket,” you must know if they mean 100 or 112 apples. That basket is like a hundredweight (CWT).
Common pitfalls and tips
– Confusion over US vs UK definitions — always clarify units in writing.
– Futures and commodities: different commodities are quoted in different units (e.g., cattle often $/cwt, coffee often cents per lb) — know the market convention.
– Carriers might use dimensional weight or minimum charges that make $/CWT pricing misleading; always compare total landed costs.
Bottom line
CWT is a legacy but still-practical unit used mainly in North American agriculture and some freight pricing. It’s simple to compute, but the two definitions (100 lb vs 112 lb) require attention. For cattle and freight, detail and contract terms (live vs carcass weight, dressing percentage, surcharges) determine true payment or shipping cost — always confirm unit definitions and additional fees before agreeing to prices.
Source
– Investopedia — “Hundredweight (CWT)” (Dennis Madamba).
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.