🌾 Grain Bin Calculator
Calculate storage capacity for cylindrical grain bins with peaked roofs and adjust for moisture shrink.
Height from grain surface to roof peak. Set to 0 for flat storage.
Optional adjustment for drying losses.
How to Use This Calculator
Measure bin dimensions
Record inside diameter, sidewall height, and estimated peak height of stored grain.
Enter moisture shrink
Account for drying losses if grain will be conditioned after harvest.
Plan logistics
Use bushel totals to schedule trucks, dryers, and marketing decisions.
Formula
Vcyl = π × (D/2)2 × H
Vcone = [π × (D/2)2 × Peak] ÷ 3
Total Volume = Vcyl + Vcone
Bushels = Volume ÷ 1.24446
For hopper-bottom bins, subtract hopper displacement or use manufacturer specs for more accuracy.
Full Description
Accurate bin capacity estimates support harvest logistics, grain marketing, and storage safety. Overfilling can reduce aeration, increase spoilage risk, and stress bin walls.
Re-measure bins periodically, especially after repairs or foundation settling, and monitor grain temperatures to maintain quality.
Frequently Asked Questions
Can I use outside diameter?
Use interior measurements for accuracy. Subtract wall thickness from outside dimensions if needed.
How do hopper bottoms affect capacity?
Hoppers displace volume. Deduct hopper volume or consult manufacturer charts.
Does grain type change the conversion?
Bushel weight varies by crop. Adjust metric-ton conversion for soybeans, wheat, etc.
Why include moisture shrink?
Drying removes water weight. Adjusted bushels estimate final marketable volume after conditioning.