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Last updated: April 8, 2026

Quick Answer: The term 'cwt' most commonly refers to the 'hundredweight,' a unit of mass. Historically, it has had different values depending on the region, but in modern usage, especially in the United States and Canada, it typically equals 100 pounds. In the United Kingdom, the 'long hundredweight' is still used and is equivalent to 112 pounds.

Key Facts

CWT is an abbreviation for 'hundredweight,' a unit of mass.
In the US and Canada, one cwt equals 100 pounds (approximately 45.36 kg).
In the UK, the traditional 'long hundredweight' equals 112 pounds (approximately 50.80 kg).
The hundredweight has historical roots and its exact value has varied geographically and over time.
It is commonly used for weighing commodities like grain, feed, and livestock.

Overview

The abbreviation 'cwt' is frequently encountered in various industries, particularly those dealing with agricultural products, livestock, and certain raw materials. Its primary meaning refers to the 'hundredweight,' a historical unit of mass. While seemingly straightforward, the precise value of a hundredweight has a fascinating duality, largely dependent on the geographical region where it's being used. This seemingly simple unit carries with it a legacy of trade and standardization, evolving over centuries to meet the needs of commerce.

Understanding 'cwt' is crucial for anyone involved in bulk commodity trading, agricultural science, or even historical research concerning trade. The difference between the American/Canadian hundredweight and the British hundredweight might seem minor, but in large-scale transactions, it can represent significant discrepancies in quantity and value. This unit's persistence highlights how older measurement systems continue to influence modern practices, often intertwined with the metric system but retaining their own established terminology and value.

How It Works

Definition: The term 'cwt' is a contraction derived from the Middle English 'hundreðweht,' meaning 'hundred weight.' It signifies a quantity of 100 units of weight, but as noted, the definition of that 'unit' has varied.
US/Canadian Standard: In the United States and Canada, the hundredweight is standardized to 100 pounds (lb). This is the most common usage in North America for agricultural commodities like corn, soybeans, hay, and animal feed. This conversion is straightforward: 1 cwt = 100 lbs, which is approximately 45.36 kilograms.
British Standard (Long Hundredweight): In the United Kingdom, the traditional 'long hundredweight' remains in use, though less frequently than in North America. This unit is defined as 112 pounds. This value originates from the older system where a hundredweight was made up of eight 'stone,' with each stone being 14 pounds (8 x 14 = 112). Therefore, 1 UK cwt = 112 lbs, approximately 50.80 kilograms.
Historical Context: Historically, the hundredweight's value was not always consistently 100 or 112 pounds. It could vary significantly by region and commodity, sometimes being closer to 120 pounds. The standardization to 100 or 112 pounds represents a move towards greater uniformity for trade and industry.

Key Comparisons

Feature	US/Canadian cwt	UK Long cwt
Pounds Equivalent	100 lbs	112 lbs
Kilogram Equivalent	~45.36 kg	~50.80 kg
Common Usage	Agriculture (grain, feed, livestock pricing), industrial materials	Historically for general goods, still seen in some agricultural contexts, but less prevalent than US cwt
Origin	Standardized for modern trade	Derived from traditional imperial units (8 stone x 14 lbs/stone)

Why It Matters

Commodity Trading: The hundredweight is a standard unit for pricing and trading numerous commodities. For instance, grain prices are often quoted per bushel, but transportation and bulk sales might involve calculations based on weight, where 'cwt' is relevant. Livestock, particularly cattle, is frequently sold by the hundredweight. A steer weighing 1,200 pounds would be marketed as weighing 12 cwt (US).
Economic Impact: Misinterpreting 'cwt' can lead to significant financial errors in contracts and transactions. A contract for 1,000 cwt of a product could be for 100,000 lbs (US) or 112,000 lbs (UK), representing a difference of 12,000 pounds. This can impact cost calculations, logistics, and profit margins substantially.
Historical Research: For historians studying trade, agriculture, or economic history, understanding the varied meanings of 'cwt' across different periods and locations is essential for accurate interpretation of primary sources and economic data. It provides a window into the evolution of measurement systems and global commerce.

In conclusion, while the metric system (kilograms and tonnes) dominates global trade and scientific measurements, the hundredweight (cwt) continues to hold its ground in specific sectors, particularly in North America. Its dual meaning, based on regional usage, underscores the importance of context when encountering this historical unit of mass. Whether dealing with agricultural futures, livestock markets, or historical texts, recognizing the distinction between the 100-pound and 112-pound hundredweight is key to accurate understanding and successful transactions.