What it means
The abbreviation is commonly cwt. It can appear in quotes for agricultural products, industrial materials and transport charges, where a price is stated per hundredweight rather than per kilogram or tonne.
The name sounds unambiguous, but the short hundredweight (100 pounds) and long hundredweight (112 pounds) differ by 12 pounds, which can materially affect an invoice when thousands of units are purchased. NIST's general measurement tables distinguish the 100-pound hundredweight from the 112-pound long hundredweight.
A kilogram conversion should therefore follow the chosen definition rather than rely on the abbreviation alone. The short hundredweight is approximately 45.359 kilograms, while the long hundredweight is approximately 50.802 kilograms, and the exact pound-to-kilogram conversion can be used when the contract requires greater precision.
A commodity price per cwt is a unit price, not a total shipment price. The invoice calculation also needs the measured weight and the rules for quality adjustments, deductions and rounding.
Freight pricing can use billable rather than physical weight, so minimum charges, density rules or other tariff conditions may alter the amount billed even when the shipment's scale weight is known. The related ton also has variants.
Twenty short hundredweights make a short ton of 2,000 pounds, while twenty long hundredweights make a long ton of 2,240 pounds. International comparisons are safest when quantities and prices are converted to one common unit, because a seemingly cheaper quote may become more expensive after its measurement basis is made comparable.
Managers should check the unit at purchase-order approval, not wait until an invoice dispute. Supplier quotes, delivery documents and the accounting system should carry the same defined measurement.
The practical importance is control over quantity and cost, since a small ambiguity in a unit label can become a large payment error when repeated across shipments, while a documented conversion makes prices easier to audit.
In practice
Real-world examples.
Example
A grain quote states $18 per short cwt. A shipment of 10,000 pounds contains 100 short cwt, giving a base price of 100 x $18 = $1,800 before any quality or delivery adjustments.
Example
A buyer compares a British quote per long cwt with a U.S. quote per short cwt. The unit prices cannot be compared directly because the quoted quantities differ by 12 pounds. The buyer converts both to a price per kilogram before choosing a supplier.
Example
A freight invoice uses a minimum billable weight above the actual shipment weight. The manager checks the tariff instead of assuming the cwt total must equal the scale reading alone. The extra charge turns out to be a legitimate minimum, not an error.
Formula
Calculation
Number of hundredweights equals shipment weight in pounds divided by pounds per hundredweight. Total base charge equals that quantity multiplied by the price per cwt.
For a shipment of 11,200 pounds, the shipment contains 11,200 / 100 = 112 short cwt or 11,200 / 112 = 100 long cwt. At $20 per cwt, the totals would be 112 x $20 = $2,240 or 100 x $20 = $2,000 respectively if all other terms were identical, a $240 difference caused only by the unit definition.
To compare fairly, $20 per long cwt corresponds to about $17.86 per short cwt, because 100 pounds is 100/112 of a long hundredweight and $20 x 100/112 = $17.86. Tax, delivery and quality terms still need separate comparison.Case study
Seen in the real world.
The following is an illustrative and fictional case. Field Stone Ingredients bought bulk material from suppliers in two countries and entered both quotes as dollars per cwt. The purchasing system did not record whether the unit was short or long. Finance found an unexplained cost variance after receiving a shipment and checking the supplier's weight documentation. The team converted both quotes to dollars per kilogram and identified the different measurement bases.
The apparent price advantage in the original comparison had been partly a unit mismatch rather than a true saving. Procurement added the full unit definition to purchase orders and kept a controlled conversion table. Receiving staff also recorded original scale weights so invoice checks did not depend on a supplier's converted total alone. The change prevented a recurring error without changing suppliers. Clear quantity definitions made negotiation and payment more reliable than comparing an ambiguous abbreviation.
Watch out
Common mistakes.
- Assuming cwt always means 100 pounds. The long hundredweight is 112 pounds.
- Comparing unit prices before converting quantities. Different measurement bases can reverse the apparent cheaper option.
- Ignoring tariff and quality adjustments. The measured quantity may not be the same as the billable quantity or final charge.
Questions
People also ask.
What does cwt stand for?
It is the common abbreviation for hundredweight, but the short or long definition should be stated explicitly.
How many hundredweights are in a ton?
There are 20 in the corresponding short or long ton, but a metric tonne uses a different mass and needs conversion.
Why does the unit matter to finance?
It determines quantity-based costs, invoice checks and price comparisons, so a wrong definition can create real payment and margin errors.
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