Bushel (unit of dry volume)

Definitions and conversions

By definition, one bushel equals 4 pecks or 8 gallons. Because the size of a "gallon" differs between systems, the volume of a bushel varies by country. The British (imperial) bushel is derived from the imperial gallon and is equal to about 36.3687 litres. In the United States the bushel has been legally specified as 2,150.42 cubic inches, which converts to roughly 35.2391 litres. For further technical context on traditional units see imperial unit and the role of the gallon in these definitions.

History and development

The bushel has medieval roots as a practical container size used in markets and for taxation. Over centuries it was standardized in various jurisdictions to ensure consistent trade. In the 19th century, the British Imperial system consolidated many measures, fixing the imperial gallon (and thus the imperial bushel) by definition. North American practice followed a different gallon standard, leaving a persistent small discrepancy between the imperial and U.S. bushel volumes.

Uses, examples and commercial practice

Today the bushel remains widely used in agriculture and commodity markets, especially in the United States and in historical contexts elsewhere. Farmers report yields in bushels per acre; grain elevators and commodity trades price and deliver in bushels. Although the bushel is a unit of volume, commercial contracts commonly reference standard "bushel weights" for particular crops. U.S. market conventions, for example, often use nominal weights such as 60 pounds per bushel for wheat, 56 pounds per bushel for corn, and 60 pounds per bushel for soybeans—standards that help convert between volume-based and weight-based trade.

Distinctive facts and modern context

Because it is a volume measure, the actual mass represented by a bushel depends on the commodity's density and moisture content. This is why regulators and markets adopt standard test weights for specific crops. Internationally, metric units (litres, tonnes) have largely replaced traditional measures for official statistics and scientific work, but the bushel persists in practical agriculture, commodity pricing and historical records. For legal, trade or conversion purposes it is important to check whether the imperial or U.S. definition is intended.

• Abbreviations: bu., bsh.
• Equivalents: 1 bushel = 4 pecks = 8 gallons (system-dependent)
• Approximate volumes: imperial ≈ 36.3687 L; U.S. ≈ 35.2391 L (2,150.42 in³)