Feed Inventory
Charts, Tables and Formulas
Compiled by Bob Cropp
UW-Extension Agriculture Agent
Pepin County
715-672-5214
Table of Contents
Page
Dry Matter Capacities of Upright Silos, Table 1 .....................................3
Calculating Capacities with a Partially Fed Silo .....................................4
Capacities of Upright Silos, Table 2........ ...............................................5
Silo Capacities for Whole Shelled Corn, Table 3....................................6
Circular Storage Structures, Table 4........................................................7
Volume Adjustments for Wet Corn, Table 5...........................................8
Bushel Weights of Grain, Table 6 ...........................................................9
Drive-Over Silage Piles .........................................................................10
Ear Corn .................................................................................................10
Bunker Silo Forage ................................................................................11
Silage Bags.............................................................................................11
2
Table 1 – Dry Matter Capacities of Upright Silos (Tons)
Depth of
Settled
Silage
(ft.)
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
Inside Diameter of Silo
10
12
14
16
18
20
22
24
0
1
1
2
3
4
5
6
7
8
9
11
12
13
15
16
18
19
21
22
24
26
27
29
31
32
34
35
37
38
0
1
2
3
4
6
7
9
10
12
14
15
17
19
21
23
25
28
30
32
34
37
39
42
44
46
48
50
53
55
1
2
3
4
6
8
10
12
14
16
19
21
24
26
29
32
35
38
41
44
47
50
53
57
60
63
66
69
72
75
77
80
83
86
89
1
2
4
6
8
10
13
15
18
21
24
27
31
34
38
41
45
49
53
57
61
65
70
74
78
82
86
90
94
97
101
105
109
112
116
1
3
5
7
10
13
16
19
23
27
31
35
39
43
48
52
57
62
67
72
77
83
88
94
99
104
109
114
118
123
128
133
137
142
147
152
157
161
166
171
1
3
6
9
12
16
20
24
28
33
38
43
48
54
59
65
71
77
83
89
96
102
109
116
123
128
134
140
146
152
158
164
170
176
182
187
193
199
205
211
1
4
7
11
15
19
24
29
34
40
46
52
58
65
71
78
85
93
100
108
116
124
132
140
148
155
163
170
177
184
191
198
205
212
220
227
234
241
248
255
2
5
9
13
18
23
29
35
41
48
55
62
69
77
85
93
102
110
119
128
138
147
157
167
177
185
194
202
210
219
227
236
244
253
261
270
278
287
295
304
3
Calculating Capacities With a Partially Fed Silo
To calculate tons remaining in a silo after part of the feed is removed, use the following steps:
1.
Use the chart to determine the tons of silage when the silo was full
tons
2.
Determine the tons in the silo filled to the height equal to the
depth of silage removed.
tons
Remaining silage (#1 minus #2)
tons
3.
-------------------------------------------------------------Example: A 20 foot silo filled to a settled depth of 60 feet and 22 feet of height were fed off.
1.
2.
3.
20’ x 60’ silo (full)
20’ x 22’ of silage fed off
Remaining silage
152 tons
38 tons
114 tons (dry matter)
4
Table 2 - Capacities of Upright Silos (As-Fed Tons)
Diameter and
Settled Depth
12 x 30
12 x 40
12 x 50
14 x 40
14 x 50
14 x 55
16 x 50
16 x 60
16 x 65
18 x 50
18 x 60
18 x 70
20 x 60
20 x 70
20 x 80
24 x 60
24 x 70
24 x 80
24 x 90
30 x 80
30 x 90
Alfalfa Silage
60% Moisture
57
80
104
114
148
164
200
250
270
260
320
390
410
490
580
620
740
870
1,000
1,430
1,650
Corn Silage
65% Moisture
62
87
111
121
158
175
210
260
280
270
340
400
420
500
580
620
740
850
970
1,480
1,710
Ground Ear Corn
35% Moisture
83
112
142
155
197
220
260
320
350
330
410
480
510
600
690
740
870
1,000
1,140
1,590
1,800
5
Table 3 – Silo Capacities for Whole Shelled Corn
Diameter and
Settled Depth
12 x 30
12 x 40
12 x 50
14 x 40
14 x 50
14 x 55
16 x 50
16 x 60
16 x 65
18 x 50
18 x 60
18 x 70
20 x 60
20 x 70
20 x 80
24 x 60
24 x 70
24 x 80
24 x 90
30 x 80
30 x 90
25% Moisture
84
112
142
156
195
220
260
310
340
330
400
470
490
580
660
720
840
970
1,090
1,530
1,730
“As-Fed” Tons
30% Moisture
92
124
156
170
220
240
280
340
370
360
440
510
540
640
730
790
930
1,070
1,200
1,680
1,900
35% Moisture
101
136
173
187
240
260
310
380
410
400
480
570
570
700
810
880
1,020
1,180
1,330
1,860
2,100
6
Table 4 – Circular Storage Structures (Cubic Feet)
Depth
(feet)
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
10
157
314
471
628
785
942
1100
1257
1414
1571
1728
1885
2042
2199
2356
2513
2670
2827
2985
3142
3299
3456
3613
3770
3927
4084
4241
4398
4555
4712
12
226
452
679
905
1131
1357
1583
1810
2036
2262
2488
2714
2941
3167
3393
3619
3845
4072
4298
4524
4750
4976
5202
5429
5655
5881
6107
6333
6560
6786
14
308
616
924
1232
1539
1847
2155
2463
2771
3079
3387
3695
4002
4310
4618
4926
5234
5542
5850
6158
6465
6773
7081
7389
7697
8005
8313
8621
8928
9236
9544
9852
10160
10468
10776
16
402
804
1206
1608
2011
2413
2815
3217
3619
4021
4423
4825
5228
5630
6032
6434
6836
7238
7640
8042
8445
8847
9249
9651
10053
10455
10857
11259
11662
12064
12466
12868
13270
13672
14074
Inside Diameter of Silo (feet)
18
20
22
24
509
628
760
905
1018
1257
1521
1810
1527
1885
2281
2714
2036
2513
3041
3619
2545
3142
3801
4524
3054
3770
4562
5429
3563
4398
5322
6333
4072
5027
6082
7238
4580
5655
6842
8143
5089
6283
7603
9048
5598
6912
8363
9953
6107
7540
9123
10857
6616
8168
9883
11762
7125
8796
10644 12667
7634
9425
11404 13572
8143
10053 12164 14476
8652
10681 12925 15381
9161
11310 13685 16286
9670
11938 14445 17191
10179 12566 15205 18096
10688 13195 15966 19000
11197 13823 16726 19905
11706 14451 17486 20810
12215 15080 18246 21715
12723 15708 19007 22619
13232 16336 19767 23524
13741 16965 20527 24429
14250 17593 21287 25334
14759 18221 22048 26239
15268 18850 22808 27143
15777 19478 23568 28048
16286 20106 24328 28953
16795 20735 25089 29858
17304 21363 25849 30762
17813 21991 26609 31667
18322 22619 27370 32572
18831 23248 28130 33477
19340 23876 28890 34382
19849 24504 29650 35286
20358 25133 30411 36191
25
982
1963
2945
3927
4909
5890
6872
7854
8836
9817
10799
11781
12763
13744
14726
15708
16690
17671
18653
19635
20617
21598
22580
23562
24544
25525
26507
27489
28471
29452
30434
31416
32398
33379
34361
35343
36325
37306
38288
39270
26
1062
2124
4247
5309
6371
7433
8495
9557
10619
11680
12742
13804
14866
15928
16990
18052
19113
20175
21237
22299
23361
24423
25485
26546
27608
28670
29732
30794
31856
32918
33979
35041
36103
37165
38227
39289
40351
41412
42474
28
1232
2463
3695
4926
6158
7389
8621
9852
11084
12315
13547
14778
16010
17241
18473
19704
20936
22167
23399
24630
25862
27093
28325
29556
30788
32019
33251
34482
35714
36945
38177
39408
40640
41871
43103
44334
45566
46797
48029
49260
30
1414
2827
4241
5655
7069
8482
9896
11310
12723
14137
15551
16965
18378
19792
21206
22619
24033
25447
26861
28274
29688
31102
32515
33929
35343
36757
38170
39584
40998
42412
43825
45239
46653
48066
49480
50894
52308
53721
55135
56549
To convert to bushels of corn, multiply cubic feet times .8 (If the corn is 15.5% moisture).
Use Table 5 to adjust for other moisture levels.
7
Table 5 – Volume Adjustments for Wet Corn
Moisture Content
15.5
16
17
18
19
20
22
24
26
28
30
32
34
Shelled Corn
X
.800
.794
.787
.781
.775
.769
.758
.741
.725
.709
.694
.680
.667
Bushels/Cubic Feet
Ground Ear Corn
X
.515
.510
.508
.500
.495
.488
.476
.465
.455
.444
.435
.427
.420
Example: 20’ diameter by 40’ high unit with 28% moisture shelled corn
20’ x 40’ unit = 12,566 cubic feet (from Table 4)
12,566 x .709 (from Table 5) = 8,909 bushels
8
Table 6 – Bushel Weights of Grain
Moisture
Content
Corn
Soybean
5.00
6.00
7.00
8.00
9.00
10.00
10.50
11.00
11.50
12.00
12.50
13.00
13.50
14.00
14.50
15.00
15.50
16.00
16.50
17.00
17.50
18.00
18.50
19.00
19.50
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
31.00
32.00
33.00
34.00
35.00
36.00
37.00
38.00
39.00
40.00
49.81
50.34
50.88
51.43
52.00
52.58
52.87
53.17
53.47
53.77
54.08
54.39
54.71
55.02
55.35
55.67
56.00
56.33
56.67
57.01
57.36
57.71
58.06
58.42
58.78
59.15
59.90
60.67
61.45
62.26
63.09
63.95
64.82
65.72
66.65
67.60
68.58
69.59
70.63
71.70
72.80
73.94
75.11
76.32
77.57
78.87
54.95
55.53
56.13
56.74
57.36
58.00
58.32
58.65
58.98
59.32
59.66
60.00
60.35
60.70
61.05
61.41
61.78
62.14
62.51
62.89
63.27
63.66
64.05
64.44
64.84
65.25
66.08
66.92
67.79
68.68
69.60
70.54
71.51
72.50
73.52
74.57
75.65
76.76
77.91
79.09
80.31
81.56
82.86
84.19
85.57
87.00
Barley
Oats
Rye
Wheat
43.20
43.66
44.13
44.61
45.10
45.60
45.85
46.11
46.37
46.64
46.90
47.17
47.45
47.72
48.00
48.28
48.57
48.86
49.15
49.45
49.75
50.05
50.36
50.67
50.98
51.30
51.95
52.62
53.30
54.00
54.72
55.46
56.22
57.00
57.80
58.63
59.48
60.35
61.25
62.18
63.14
64.13
65.14
66.19
67.28
68.40
28.97
29.28
29.59
29.91
30.24
30.58
30.75
30.92
31.10
31.27
31.45
31.63
31.82
32.00
32.19
32.38
32.57
32.76
32.96
33.16
33.36
33.56
33.77
33.98
34.19
34.40
34.84
35.28
35.74
36.21
36.69
37.19
37.70
38.22
38.76
39.31
39.88
40.47
41.07
41.70
42.34
43.00
43.68
44.39
45.11
45.87
50.69
51.23
51.78
52.35
52.92
53.51
53.81
54.11
54.42
54.73
55.04
55.36
55.68
56.00
56.33
56.66
56.99
57.33
57.68
58.02
58.38
58.73
59.09
59.46
59.83
60.20
60.96
61.74
62.55
63.37
64.21
65.08
65.97
66.89
67.83
68.80
69.80
70.82
71.88
72.97
74.09
75.25
76.44
77.68
78.95
80.27
54.63
55.21
55.81
56.41
57.03
57.67
57.99
58.31
58.64
58.98
59.31
59.66
60.00
60.35
60.70
61.06
61.42
61.79
62.16
62.53
62.91
63.29
63.68
64.07
64.47
64.88
65.70
66.54
67.40
68.29
69.20
70.14
71.10
72.08
73.10
74.14
75.22
76.32
77.46
78.64
79.85
81.09
82.38
83.71
85.08
86.50
*Bolded number is the standard weight and moisture level
9
Drive-Over Silage Piles
1.
Calculate cubic feet of feed
Average width x length x height (measured in feet)=cubic feet
2.
Convert cubic feet to tons
Cubic feet x .011 = tons of forage (as fed)
------------------------------------------------------------Example: 30’ x 60’x 4’ pile
4 x 30 x 60 = 7,200 cubic feet
7,200 cubic feet x .011 = 79 tons of silage (as fed)
Ear Corn
Step 1 – Calculate the cubic feet of ear corn
Rectangular Cribs: Multiply average width x length x height
Example: 3’ x 10’ x 35’ = 1,050 cubic feet
Round Cribs: Use πr2 x height
Example: 12’ diameter round crib, 20’ high
3.414 x (62) x 20’ = 2,458 cubic feet
Step 2 – Calculate bushels
Cubic feet x .4 = bushels
-------------------------------------------------------------Example:
Rectangular crib (above example) 1,050 x .4 = 420 bushels
Round crib (above example) 2,458 x .4 = 983 bushels
10
Bunker Silo Forage
Use the following steps to determine the tonnage of forage in your bunker silos:
1.
Determine cubic feet of forage
Average height x width x length (measured in feet) =
ft3
x
x
ft3
=
Dry Matter Value
2.
Multiply cubic feet times the density of
feed (Use your tested value if you have it)
15
#/ft3
As Fed
40
#/ft3
3.
Multiply #1 x #2 for total pounds of forage
#
#
4.
Divide by 2000 to calculate tonnage
tons
tons
------------------------------------------------------------Example: 9’ x 36’ x 80’ Bunker Silo
9 x 36 x 80 = 25,920 cubic feet
25,920 x 40 = 1,036,800 pounds (as fed)
1,036,800 ) 2000 = 518 tons of feed (as fed)
Silage Bags
Diameter
8 ft.
9 ft.
10 ft.
12 ft.
*Tons of feed/foot of bag length
1.0
1.2
1.5
2.2
*Based on 65% moisture and 13 lbs/ft3 density
-------------------------------------------------------------Example: 9 ft diameter bag, 75 feet long
1.2 x 75 = 90 tons of forage (as fed)
11