University of Missouri Extension

G4020, Reviewed October 1993

Tables for Weights and Measurement: Crops

William J. Murphy
Department of Agronomy

These tables give weights per bushel, weights of grain by volume, moisture conversion and planting rates.

Table 1
Weights per bushel

Table 2
Calculating approximate weight of grain by volume

Standard bushel weight Pounds per cubic feet
60 pounds 48.18
56 pounds 44.97
50 pounds 40.15
48 pounds 38.54
45 pounds 36.14
28 pounds 22.48
14 pounds 11.24
70 pounds (ear corn) 28.001
1 Varies greatly with ear size and moisture content.

Measuring cubic feet

Width in feet multiplied by length in feet multiplied by depth of grain in feet equals cubic feet in square or rectangular enclosures.

Example

10 feet width x 14 feet length x 9 feet grain depth = 1,260 cu. feet

In circular bins, the formula is: pi (3.14) multiplied by the radius squared, multiplied by the depth of grain = cubic feet.

Obtaining total grain weight

Multiply cubic feet of volume by the appropriate figure from Table 2 under pounds per cubic feet.

If actual bushel weight (test weight) is available, multiply actual bushel weight by 0.803. This calculation will give a more accurate figure for pounds per cubic feet than you can get from the table.

Table 3
Moisture conversion for ear and shelled corn

Moisture in grain Harvest weight of ear corn to yield 56 pounds of shelled corn at 15.5 percent moisture1 Shelled corn equivalent to 56 pounds of shelled corn at 15.5 percent moisture
10 percent 63.49 pounds 52.56 pounds
10.5 percent 63.86 pounds 52.87 pounds
11 percent 64.25 pounds 53.16 pounds
11.5 percent 64.65 pounds 53.46 pounds
12 percent 65.06 pounds 53.77 pounds
12.5 percent 65.60 pounds 54.08 pounds
13 percent 65.95 pounds 54.39 pounds
13.5 percent 66.42 pounds 54.70 pounds
14 percent 66.89 pounds 55.02 pounds
14.5 percent 67.39 pounds 55.34 pounds
15 percent 67.89 pounds 55.67 pounds
15.5 percent 68.40 pounds 56.00 pounds
16 percent 68.94 pounds 56.33 pounds
16.5 percent 69.51 pounds 56.67 pounds
17 percent 70.09 pounds 57.01 pounds
17.5 percent 70.69 pounds 57.35 pounds
18 percent 71.31 pounds 57.70 pounds
18.5 percent 71.95 pounds 58.06 pounds
19 percent 72.60 pounds 58.41 pounds
19.5 percent 73.27 pounds 58.78 pounds
20 percent 73.96 pounds 59.15 pounds
20.5 percent 74.60 pounds 59.52 pounds
21 percent 75.36 pounds 59.89 pounds
21.5 percent 76.07 pounds 60.28 pounds
22 percent 76.79 pounds 60.66 pounds
22.5 percent 77.53 pounds 61.05 pounds
23 percent 78.25 pounds 61.45 pounds
23.5 percent 79.01 pounds 61.85 pounds
24 percent 79.76 pounds 62.26 pounds
24.5 percent 80.50 pounds 62.67 pounds
25 percent 81.25 pounds 63.09 pounds
25.5 percent 82.03 pounds 63.51 pounds
26 percent 82.82 pounds 63.94 pounds
26.5 percent 83.50 pounds 64.38 pounds
27 percent 84.19 pounds 64.82 pounds
27.5 percent 84.90 pounds 65.26 pounds
28 percent 85.62 pounds 65.72 pounds
28.5 percent 86.32 pounds 66.18 pounds
29 percent 87.04 pounds 66.64 pounds
29.5 percent 87.76 pounds 67.12 pounds
30 percent 88.50 pounds 67.60 pounds
30.5 percent 89.22 pounds 68.08 pounds
31 percent 89.94 pounds 68.57 pounds
31.5 percent 90.67 pounds 69.08 pounds
32 percent 91.43 pounds 69.58 pounds
32.5 percent 92.13 pounds 70.10 pounds
33 percent 92.85 pounds 70.62 pounds
33.5 percent 93.55 pounds 71.15 pounds
34 percent 94.28 pounds 71.69 pounds
34.5 percent 94.98 pounds 72.24 pounds
35 percent 95.71 pounds 72.80 pounds
1Ear corn values supplied by Dr. Marcus Zuber, MU Agronomy Department. Ear corn values apply with greatest accuracy at harvest because differences in cob and grain moisture will change in storage. Shelled corn figures apply at any time.

Obtaining bushels of grain

Divide total grain weight by appropriate standard bushel weight.

Obtaining number of hundredweights (cwts) of grain

Divide total grain weight by 100.

Table 4
Moisture conversion for soybeans

Moisture in grain Soybeans equivalent to 60 pounds of Soybeans at 13.0 percent Moisture
10 percent 58.00 pounds
11 percent 58.65 pounds
12 percent 59.32 pounds
13 percent 60.00 pounds
14 percent 60.70 pounds
15 percent 61.41 pounds
16 percent 62.14 pounds
17 percent 62.89 pounds
18 percent 63.66 pounds
19 percent 64.64 pounds
20 percent 65.25 pounds
21 percent 66.08 pounds
22 percent 66.92 pounds
23 percent 67.79 pounds
24 percent 68.68 pounds
25 percent 69.60 pounds
26 percent 70.54 pounds
27 percent 71.51 pounds
28 percent 72.50 pounds
29 percent 73.52 pounds
30 percent 74.57 pounds

Table 5
Moisture conversion for wheat

Moisture in grain Wheat equivalent to 60 pounds of wheat at 13.5 percent moisture
10 percent 57.67 pounds
11 percent 58.65 pounds
12 percent 59.32 pounds
13 percent 59.66 pounds
13.5 percent 60.00 pounds
14 percent 60.35 pounds
15 percent 61.06 pounds
16 percent 61.79 pounds
17 percent 62.53 pounds
18 percent 63.29 pounds
19 percent 64.07 pounds
20 percent 64.88 pounds
21 percent 65.70 pounds
22 percent 66.54 pounds
23 percent 67.40 pounds
24 percent 68.29 pounds
25 percent 69.20 pounds
26 percent 70.14 pounds
27 percent 71.10 pounds
28 percent 72.08 pounds
29 percent 73.10 pounds
30 percent 74.14 pounds

Table 6
Moisture conversion for grain sorghum

Percent moisture in grain Grain sorghum equivalent to 56 pounds of grain sorghum at 13 percent moisture
10 percent 54.13 pounds
11 percent 54.74 pounds
12 percent 55.36 pounds
13 percent 56.00 pounds
14 percent 56.65 pounds
15 percent 57.32 pounds
16 percent 58.00 pounds
17 percent 58.70 pounds
18 percent 59.41 pounds
19 percent 60.15 pounds
20 percent 60.90 pounds
21 percent 61.67 pounds
22 percent 62.46 pounds
23 percent 63.27 pounds
24 percent 64.11 pounds
25 percent 64.96 pounds
26 percent 65.83 pounds
27 percent 66.74 pounds
28 percent 67.67 pounds
29 percent 68.62 pounds
30 percent 69.60 pounds

Calculating other conversion factors

These conversion tables cover the most widely grown crops and the most common moisture contents. When you need other conversions, the calculations are relatively simple.

Use percent dry matter in making conversions because the problem is to obtain the same weight of dry matter as is found in a standard bushel. For example, a standard bushel of wheat contains 60 pounds at 13.5 percent moisture. Thus, 86.5 percent dry matter (100-13.5) x 60 pounds = 51.9 pounds of dry matter.

Example
How many pounds of 20.5 percent moisture wheat is equivalent to a standard bushel?

13.5 percent Standard Moisture Content = 100 - 13.5 = 86.5 percent Dry Matter

20.5 percent Moisture Content = 100 - 20.5 = 79.5 percent Dry Matter

86.5 ÷ 79.5 = 108.8 percent

(108.8 x Standard Bu. Wt. (60 for Wheat)) ÷ 100 = 65.28 pounds equivalent to a standard bushel

To check your answer:

65.28 x 79.5 percent dry matter = 51.9 pounds of dry matter

Table 7
Common measures and approximate metric equivalents

Table 8
Conversion factors for metric and English units

Length

Area

Volume

Weight

Yield or rate

Temperature

Table 9
Mixing small quantities of liquid spray. The first column represents concentration of active ingredient per gallon; the second column provides corresponding amount to mix for 1,000 square feet to get 1 pound per acre of active ingredient

Concentration of active ingredient per gallon Amount to mix for 1000 square feet to get 1 pound per acre of active ingredient
1 pound 7 tablespoons or 103 milliliters
2 pounds 3.5 tablespoons or 51.5 milliliters
3 pounds 2.3 tablespoons or 34.3 milliliters
4 pounds 1.7 tablespoons or 25.8 milliliters

Checking planting rate or stand per acre

This table may be useful in checking actual planting rate when planting a crop. It can also be used in obtaining stand counts.

Determine average spacing in inches between seeds (or plants) in the row. Then divide the appropriate figure in the right hand column by this figure to determine planting rate (or stand).

Example
Grain sorghum planted in 30-inch rows is found to average 2.5 inches between seeds.

209,088 ÷ 2.5 = 83,635 seeds being planted per acre.

Or the grain sorghum stand averages 1 plant per 3.5 inches of row. Then 209,088 ÷ 3.5 = 59,379 plants per acre.

You can use this method without the table as long as you remember that there are 43,560 square feet per acre and that 144 square inches = 1 square foot.

43,560 x 144 = 6,272,630 square inches per acre.

Divide 6,272,640 by inches of row width to obtain inches of row per acre (6,272,640 ÷ 30 = 209,088).

Row spacing Inches of row per acre
40 inches 155,682
38 inches 165,069
36 inches 174,240
30 inches 209,088
28 inches 224,023
24 inches 261,360
20 inches 313,632
18 inches 348,480
15 inches 418,176
14 inches 448,046
12 inches 522,720
10 inches 627,264
8 inches 784,080
7 inches 896,091
G4020 Tables for Weights and Measurements: Crops | University of Missouri Extension

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