Grain Bin Calculator - Storage Volume and Capacity Analysis
Calculate grain bin volume, bushel capacity, and weight capacity for corn, wheat, soybeans, and other grains. Includes aeration recommendations, moisture management, and storage planning tools.
Grain Bin Calculator — Storage Volume & Capacity
Calculate bushels, weight capacity, aeration needs. Supports corn, wheat, soybeans, and more.
Sample Scenarios — Click to Load
Inputs
For educational use only. Always confirm dosages and care with a licensed veterinarian.
📋 Key Takeaways
- • V = π × r² × h — cylindrical volume. Add roof volume (flat 0%, peaked 15%, dome 20%).
- • Bushels = Volume (ft³) ÷ 1.244. Weight = Bushels × test weight (grain-specific).
- • Fill 90–95% for safety. Grain expands with moisture. Never fill to 100%.
- • Aeration: 0.1–0.2 CFM/bu. 1/8–1/4 HP per 1000 bu depending on bin size.
💡 Did You Know?
📖 How Grain Bin Capacity Works
V = π × r² × h. Add roof volume. Bushels = Volume ÷ 1.244. Weight = Bushels × test weight.
V = π × r² × h | Bushels = V ÷ 1.244 | Weight = Bushels × Test Weight
🎯 Expert Tips
Fill 90–95%
Never fill to 100%. Grain expands. Leave headspace for aeration.
Monitor Moisture
Store at recommended moisture. Corn ~15.5%. Wheat ~13.5%. Prevents spoilage.
Aerate Correctly
0.1–0.2 CFM per bushel. Run during cool, dry weather.
Safety First
Never enter bins without proper safety equipment. Grain entrapment is deadly.
⚖️ Grain Type Specifications
| Grain | Test Wt (lbs/bu) | Storage Moisture |
|---|---|---|
| Corn | 56 | 15.5% |
| Wheat | 60 | 13.5% |
| Soybeans | 60 | 13% |
| Oats | 32 | 14% |
| Barley | 48 | 14.5% |
| Rye | 56 | 14% |
❓ Frequently Asked Questions
How to calculate grain bin capacity?
V = π × r² × h. Add roof volume. Bushels = V ÷ 1.244. Weight = Bushels × test weight.
Total vs usable capacity?
Fill 90–95% for safety. Grain expands. Never 100%.
Aeration requirements?
1/8 HP per 1000 bu (small), 1/6 HP (medium), 1/4 HP (large). 0.1–0.2 CFM/bu.
Storage loss?
Typically 1–3%. Moisture shrink, insects, mold. Proper aeration minimizes.
📊 By the Numbers
📚 Sources
⚠️ Disclaimer: Estimates based on standard formulas. Actual capacity may vary. Never enter grain bins without proper safety equipment. Consult agricultural engineers for professional storage design.
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