Dryer Type
Storage Cost Analysis
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Introduction
Grain harvest is also a marketing decision, and many farmers make it blindly. In a typical fall, farmers dry 50,000 bushels of corn from 20% to 15% moisture, spending approximately $9,700 in propane and electricity, then store that grain for 4 to 6 months hoping for a $0.35 to $0.50/bushel basis improvement. But the total carrying cost, including shrink, facility depreciation, handling, and interest, frequently runs $0.60 to $0.80 per bushel. In many years, the basis improvement does not justify the full carry. The University of Illinois farmdoc publishes annual analyses showing that grain storage is profitable only 40% to 60% of years when all carrying costs are properly accounted for, yet the majority of farmers store grain as a default rather than a deliberate strategy. The difference is in the math.
What This Calculator Does
This calculator helps farmers and grain merchandisers analyze the full economics of on-farm grain drying and storage. It calculates drying costs (propane and electricity) based on moisture removal points, dryer type, and energy prices. It also calculates storage costs including facility amortization, handling shrink loss (at 1.183% per moisture point removed), bin insurance, and interest on the grain value. The tool then compares total carrying cost per bushel against your expected basis improvement to determine whether storing grain is more profitable than selling at harvest.
The Formula
Drying cost depends on moisture removed (number of points), dryer type efficiency, and current fuel prices. A high-temperature batch dryer uses approximately 0.022 gallons of propane per bushel per point of moisture removed. Shrink is the most underestimated cost: the industry standard is 1.183% weight loss per moisture point removed, which accounts for water weight loss (1.0%) plus handling and conveying losses (0.183%). At 5 points removed on 50,000 bushels, shrink alone removes approximately 2,958 bushels from your inventory at $4.20/bu corn, that is $12,424. Storage facility cost is approximately $0.03/bushel/month. Interest is calculated on the grain's market value at the prevailing operating loan rate.
Step-by-Step Example
Enter grain data and drying requirements
30,000 bushels of corn. Harvest moisture: 20%. Target storage moisture: 15%. Points to remove: 5. Dryer type: high-temperature batch. Propane price: $1.65/gallon. Electricity: $0.12/kWh. Drying capacity: 3,000 bushels per batch.
Calculate drying cost
Propane: 30,000 bu x 5 points x 0.022 gal/bu/point x $1.65/gal = $5,445. Electricity (fan, conveyor, controls): approximately $0.015/bu x 30,000 = $450. Total drying cost: $5,895. Cost per bushel: $0.197.
Calculate shrink loss and storage costs
Shrink: 30,000 x 5 x 0.01183 = 1,774.5 bushels lost. Value of shrink at $4.20/bu: $7,453. Storage facility: $0.03/bu/month x 5 months x 30,000 = $4,500. Handling: $0.05/bu: $1,500. Insurance: $0.0042/bu/month x 5 months x 30,000 = $630. Interest at 4.625% on $126,000 grain value for 5 months: $2,431.
Evaluate net benefit against expected basis improvement
Total carrying cost: $5,895 (drying) + $7,453 (shrink) + $4,500 (facility) + $1,500 (handling) + $630 (insurance) + $2,431 (interest) = $22,409. Per bushel (adjusted inventory: 28,225 bu after shrink): $0.794/bu. Expected basis improvement: $0.35/bu. Net result: -$0.444/bu. Storage is not justified at this basis pattern. Selling at harvest generates $0.444/bu more revenue than storing.
Real-World Use Cases
Comparing On-Farm Storage to Commercial Elevator Storage
A farmer is deciding whether to invest in additional on-farm storage or continue using the local elevator ($0.045/bu/month commercial storage plus $0.08/bu for in and out). On-farm cost model at $0.03/bu/month plus $0.01 for depreciation and maintenance = $0.04/bu/month. For 50,000 bushels stored 5 months: commercial = $21,250. On-farm = $14,750 (saving $6,500). But on-farm requires drying from 20% to 13% for safe long-term storage (2 additional points versus commercial 15%), adding $1,320 in drying costs. Net on-farm advantage: $5,180 in this scenario.
Evaluating Natural Air Drying vs. High-Temperature Drying
A farmer with low-temperature drying bin capacity models both options for 25,000 bushels at 18% moisture. Natural air to 14%: $0.005/bu/point x 4 points = $0.02/bu ($500 total), but risks quality loss if cool, wet fall weather prevents timely drying. High-temperature batch to 14%: $0.18/bu ($4,500 total). The $4,000 cost difference must be weighed against the risk of spoilage, quality discounts, or a 2 to 3 week delay in bin turnover during a busy harvest season.
Seasonal Hedge and Storage Integration
A merchandiser stores 100,000 bushels of corn in October and simultaneously sells December futures to lock in the current basis. If the cash price in March is $0.40/bu higher due to basis improvement, the carrying cost is $0.65/bu over 5 months, resulting in a net loss of $0.25/bu or $25,000. The calculation shows that the stored grain needs a $0.65/bu basis improvement just to break even, which is above the historical average for this elevator location.
Comparison
| Storage Duration | Facility Cost/Bu | Interest (4.6%, $4.20 corn) | Shrink (5 pts removed) | Minimum Basis Improvement Needed |
|---|---|---|---|---|
| 1 month | $0.03 | $0.016 | $0.249 | $0.295 |
| 2 months | $0.06 | $0.032 | $0.249 | $0.341 |
| 3 months | $0.09 | $0.048 | $0.249 | $0.387 |
| 4 months | $0.12 | $0.064 | $0.249 | $0.433 |
| 5 months | $0.15 | $0.080 | $0.249 | $0.479 |
| 6 months | $0.18 | $0.096 | $0.249 | $0.525 |
Common Mistakes to Avoid
Ignoring shrink in the economic analysis. Shrink is the single largest hidden cost in grain storage, averaging $0.25 to $0.35 per bushel for a typical 5-point drying scenario at $4.20/bu corn. Many producers only count propane and electricity when thinking about drying cost, missing the full economic picture by 50% or more.
Using the same storage moisture for all situations. Corn stored over summer requires 13% to 14% moisture for safety in warm conditions. Corn sold by March can safely be stored at 15%. Drying 2 extra points to 13% adds 38% to the drying cost and shrink compared to drying to 15% for winter storage only. Match storage moisture to your marketing timeline.
Assuming basis always improves seasonally. Basis patterns vary significantly by year, location, and crop. In large production years with export demand weakness, basis may remain flat or even weaken from fall to spring. Review 5 years of local historical basis data from your elevator before making storage assumptions.
Not monitoring stored grain actively. Grain that heats up or develops mold loses grade and value rapidly. Monitoring temperatures and CO2 levels weekly, running aeration appropriately, and addressing problems early prevents stored grain from losing $0.15 to $0.50/bu in quality discounts on top of all carrying costs.
Calculating storage profitability only at the per-bushel level. A $0.10/bushel basis improvement on 50,000 bushels is $5,000. That same $5,000 invested elsewhere for 5 months at 4.625% annual interest earns $965. The comparison must include the opportunity cost of capital tied up in stored grain.
Frequently Asked Questions
Accuracy and Disclaimer
Cost estimates are based on general industry averages for propane consumption, shrink rates, and storage facility costs. Actual costs depend on your specific dryer efficiency, current propane and electricity prices, bin size and age, grain condition at harvest, local basis patterns, and marketing strategy. Basis patterns are historical and not indicative of future performance. Consult your local grain merchandiser, extension economist, or farm financial advisor for farm-specific storage and marketing analysis.
Conclusion
The decision to store grain should be made with the same rigor as any other investment decision. When carrying costs are $0.65 per bushel and expected basis improvement is $0.30, storage is destroying value, not creating it. Calculate the numbers before the harvest ends, not in March when you are already committed. For the complete farm income picture, use the Crop Yield Revenue Calculator to track total crop revenue across stored and sold bushels, and the Break-Even Yield Calculator to confirm the storage strategy aligns with your overall profitability targets.
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