Calculate corn volume, weight, or test weight by choosing the value to solve for and entering the two required values in bushels, liters, cubic meters, pounds, or kilograms to find the selected value.
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Corn Test Weight Formula
The corn test weight calculator uses weight, volume, and test weight. The base calculation is done in pounds and bushels, then converted to the units you select.
- TW = test weight, usually in pounds per bushel
- W = total corn weight, usually in pounds
- V = corn volume, usually in bushels
Rearranged formulas are used for the selected solve mode:
- To calculate test weight: enter volume and weight. The calculator divides weight by volume.
- To calculate weight: enter volume and test weight. The calculator multiplies volume by test weight.
- To calculate volume: enter weight and test weight. The calculator divides weight by test weight.
The calculator supports bushels, liters, cubic meters, pounds, kilograms, pounds per bushel, kilograms per bushel, pounds per liter, and kilograms per liter. Internally, it converts volume to bushels and weight to pounds before applying the formula.
Common Corn Test Weight Reference Values
USDA minimum test weight is 56 lb/bu for U.S. No. 1 and 54 lb/bu for U.S. No. 2 corn. The common 56-pound marketing bushel is a mass convention, not a volume definition. Actual values can vary based on kernel density, moisture, damage, variety, and handling.
| Test Weight | General Meaning |
|---|---|
| 56 lb/bu | Minimum test weight for U.S. No. 1; other criteria also apply |
| 54 to 55.9 lb/bu | Meets the No. 2 minimum test weight; other criteria also apply |
| Below 54 lb/bu | Below the U.S. No. 2 minimum test weight; does not alone determine grade |
| Above 56 lb/bu | Higher bulk density than 56 lb/bu |
Unit Conversion Values Used for Corn Test Weight
| Unit | Conversion Used |
|---|---|
| 1 liter | 0.0283775933 U.S. dry bushel (approximately) |
| 1 cubic meter | 28.3775933 U.S. dry bushels (approximately) |
| 1 kilogram | 2.20462262185 pounds (approximately) |
| 1 lb/bu | Base test weight unit |
Example Corn Test Weight Calculations
Example 1: Calculate test weight
You have 280 pounds of corn and a measured volume of 5 bushels.
The corn test weight is 56 pounds per bushel.
Example 2: Calculate total weight
You have 12 bushels of corn with a test weight of 55 pounds per bushel.
The total corn weight is 660 pounds.
FAQ
What is corn test weight?
Corn test weight is the weight of a specific volume of corn, most commonly reported as pounds per bushel. It is a density measurement, not the same as total yield. A higher test weight means more weight fits into the same volume.
Is a bushel of corn always 56 pounds?
For marketing and reference purposes, a standard bushel of corn is commonly treated as 56 pounds. However, the actual measured weight of a bushel can be higher or lower. The calculator estimates bulk density from your measured weight and volume. Official test weight requires prescribed sampling, an approved device, and the applicable grading procedure.
Why does moisture affect corn test weight?
Moisture can change kernel size, density, and handling characteristics. As corn dries, the measured test weight may change because kernels shrink and settle differently. For accurate comparisons, use measurements taken at a consistent moisture level.
