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Grading Standards
Official U.S. Grading Standards for Wheat
| Grading Factors | Grades U.S. Number |
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| Minimum pound limits: | 1 |
2 |
3 |
4 |
5 |
| Test Weight (lbs/bu): | |||||
| HRS or White Club Wheat | 58.0 |
57.0 |
55.0 |
53.0 |
50.0 |
| All other classes and subclasses | 60.0 |
58.0 |
56.0 |
54.0 |
51.0 |
| Test Weight (kg/hl): | |||||
| HRS or White Club Wheat | 76.4 |
75.1 |
72.5 |
69.9 |
66.0 |
| Durum | 78.2 |
75.6 |
73.0 |
70.4 |
66.5 |
| All other classes and subclasses | 78.9 |
76.4 |
73.8 |
71.2 |
67.3 |
| Maximum percent limits: | 1 |
2 |
3 |
4 |
5 |
| Defects: | |||||
| Damaged kernels - Heat (part of total) | 0.2 |
0.2 |
0.5 |
1.0 |
3.0 |
| Damaged kernels - Total | 2.0 |
4.0 |
7.0 |
10.0 |
15.0 |
| Foreign material | 0.4 |
0.7 |
1.3 |
3.0 |
5.0 |
| Shrunken and broken kernels | 3.0 |
5.0 |
8.0 |
12.0 |
20.0 |
| Total 1/ | 3.0 |
5.0 |
8.0 |
12.0 |
20.0 |
| Wheat of Other Classes: 2/ | |||||
| Contrasting classes | 1.0 |
2.0 |
3.0 |
10.0 |
10.0 |
| Total 3/ | 3.0 |
5.0 |
10.0 |
10.0 |
10.0 |
| Stones | 0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
| Maximum count limits: | 1 |
2 |
3 |
4 |
5 |
| Other material (1000 gram sample): | |||||
| Animal filth | 1 |
1 |
1 |
1 |
1 |
| Castor beans | 1 |
1 |
1 |
1 |
1 |
| Crotalaria seeds | 2 |
2 |
2 |
2 |
2 |
| Glass | 0 |
0 |
0 |
0 |
0 |
| Stones | 3 |
3 |
3 |
3 |
3 |
| Unknown foreign sunstance | 3 |
3 |
3 |
3 |
3 |
| Total 4/ | 4 |
4 |
4 |
4 |
4 |
| Insect-damaged kernels in 100 grams | 31 |
31 |
31 |
31 |
31 |
| U.S. Sample grade: Wheat that: (a) Does not meet the requirements for U.S. Nos. 1, 2, 3, 4, 5; or (b) Has a musty, sour or commercially objectionable foreign odor (except smut or garlic odor); or (c) Is heating or of distinctly low quality. 1/ Includes damaged kernels (total), foreign material, and shrunken and broken kernels. 2/ Unclassed wheat of any grade may contain not more than 10.0% of wheat of other classes. 3/ Includes contrasting classes. 4/ Includes any combination of animal filth, castor beans, crotalaria seeds, glass, stones, or unknown foreign substance. |
Conversion Factors |
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Wheat Equivalents 1 bushel = 60 pounds (27.2 kg) 36.74 bushels = 1 metric ton 37.33 bushels = 1 long ton 33.33 bushels = 1 short ton 3.67 bushels = 1 quintal tons/ha = 0.06725 bu/acre durum kg/hl = lbs/bu x 1.292 + 0.630 other wheat kg/hl = lbs/bu x 1.292 + 1.419 |
Metric Equivalents 1 pound = 0.4536 kg 1 metric ton (MT) = 2204.6 lbs 1 short ton (2000 lbs) = 0.9072 MT, or 907.2 kg 1 long ton (2240 lbs) = 1.016 MT, or 1016 kg 1 metric ton = 10 quintals 1 hectare = 2.47 acres 1 acre = 0.40 hectare 1 hundredweight = 100 pounds or 45.36 kg 1 metric ton/ha. = 14.87 bu./acre |
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