Grain Bin Calculator
Calculate the bushel capacity of a cylindrical grain bin based on its diameter and grain depth.
Formula
Volume (cu ft) = π × r² × depth; Bushels = Volume ÷ 1.2445
- 1 bushel = 1.2445 cubic feet.
- Peaked grain adds approximately 0.209 × r³ / r² × height factor — use average depth.
- Bushel weights: corn 56 lbs, soybeans & wheat 60 lbs, oats 32 lbs.
24 ft diameter, 20 ft deep corn
Inputs
- Bin Diameter: 24 ft
- Average Grain Depth: 20 ft
- Grain Type: corn
r=12. Volume = π × 144 × 20 = 9,047 cu ft. Bushels = 9,047 ÷ 1.2445 ≈ 7,270 bu.
Frequently asked questions
How do I measure grain depth?
Use a grain bin depth probe or rod inserted vertically from the top. For peaked bins, measure center and edge and average them.
Does moisture content affect bushel count?
Standard bushels assume standard moisture (corn 15.5%, soybeans 13%). Adjust if grain is wet.