Grain bin capacity calculator
Bin capacity is volume times bulk density, and bulk density varies more than people expect between grains.
kg/m3
Wheat 770; barley 690; maize 720; oats 500; oilseed rape 680.
Capacity
367.39tonnes
- Volume
- 477.13
- In bushels
- 13 540
- In cubic feet
- 16 850
- Volume in the cone
- 31.81
- Floor pressure
- 52.86 kPa
Show the working
- Bin shape = 1
- Diameter or length = 9
- Width, if rectangular = 6
- Grain depth = 7
- Cone height on top = 1.5
- Bulk density = 770
- base_area = 1 > 0 ? pi * (9/2)^2 : 9 * 6 = 63.6173
- cylinder_volume = 63.6173 * 7 = 445.321
- Volume in the cone = 63.6173 * 1.5 / 3 = 31.8086
- Volume = 445.321 + 31.8086 = 477.129
- Capacity = 477.129 * 770 / 1000 = 367.39
- In bushels = 477.129 * 28.377593 = 13 539.8
- In cubic feet = 477.129 * 35.31466672148859 = 16 849.7
- Floor pressure = 7 * 770 * 9.80665 / 1000 = 52.8578
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- volume = base area x depth + base area x cone height / 3
- weight = volume x bulk density
Never enter a bin while grain is flowing. Flowing grain behaves like a liquid and cannot be climbed out of.