What Is a Bushel, and Why Do Grain Prices Use It?
A plain-English look at the bushel: how it became a weight, how it differs by crop, and how to convert bushel prices to metric tons.
If you have ever read a market report, you have seen prices quoted in dollars per bushel. The unit sounds old-fashioned, and it is, but it remains the everyday language of grain trading in the United States. Understanding it clears up a lot of confusion when you compare prices, yields and shipping volumes.
A unit of volume that became a unit of weight
Originally a bushel was a measure of volume, roughly the amount that fits in a standard container. The trouble with volume is that grain settles, packs and varies in density. A bushel of damp, light wheat holds less actual grain than a bushel of dry, plump wheat. Over time, the trade solved this by attaching a standard weight to each bushel, so a bushel of a given crop is treated as a fixed number of pounds.
In the United States, the commonly used standard weights are:
- Wheat: 60 pounds per bushel
- Soybeans: 60 pounds per bushel
- Shelled corn: 56 pounds per bushel
- Barley: 48 pounds per bushel
- Oats: 32 pounds per bushel
These figures are trading conventions. They are not the same as the measured test weight of any particular load, which we come back to below.
Why the numbers differ by crop
Different grains have different kernel sizes and densities, so the same container holds different weights. Oats are light and fluffy, while wheat and soybeans pack tightly. A standard weight lets a buyer and a seller agree on a quantity without arguing about how loosely the grain was poured into the truck.
Converting between bushels and metric tons
Much of international trade is measured in metric tons, while US prices and production figures are usually given in bushels. The conversion is simple division. A metric ton is 1,000 kilograms, or about 2,204.6 pounds. Divide that by the bushel weight:
- Wheat and soybeans: 2,204.6 ÷ 60 ≈ 36.74 bushels per metric ton
- Shelled corn: 2,204.6 ÷ 56 ≈ 39.37 bushels per metric ton
So a wheat price of $6.00 per bushel works out to about $220 per metric ton (6.00 × 36.74 ≈ 220.4). Doing this conversion lets you compare a US quote with an offer from a seller in another region, as long as you also account for freight and quality terms.
Bushels versus test weight
Test weight is the measured weight of a standard volume of a particular sample, usually expressed in pounds per bushel. Buyers use it as one quality indicator. If your wheat tests at 58 pounds per bushel, it is a little lighter than the 60-pound benchmark, and a buyer may apply a discount. The trade bushel stays fixed at 60 pounds; the test weight tells you how your grain compares with that benchmark.
Practical tips
- Always check which unit a price is quoted in before comparing offers.
- Confirm the crop-specific bushel weight when converting. Using 60 pounds for corn gives the wrong answer.
- Keep your own scale tickets so you can reconcile bushels delivered with bushels paid.
- Remember that a quoted price usually refers to a standard grade. Discounts or premiums can change what you actually receive.
Frequently asked questions
Is a bushel the same everywhere in the world? Not exactly. The US bushel and the older imperial bushel differ in size, and many countries trade by the metric ton or kilogram instead. When you read a foreign price, check both the unit and the currency.
Why do corn and wheat have different bushel weights? Because the two grains pack differently. Corn kernels are larger and leave more air space, so a standard bushel of shelled corn is set at 56 pounds, compared with 60 for wheat.
Does a price per bushel include shipping? Usually not. A futures quote or a local bid is tied to a specific delivery point and quality, and transport costs are handled separately or built into the basis.