Grain Drying Cost Calculator

About the Grain Drying Cost Calculator

Grain drying is one of the most significant post-harvest costs in corn and other grain production, often costing $0.03–$0.06 per bushel per point of moisture removed. The expense includes energy (propane, natural gas, or electricity), shrinkage from moisture weight loss, equipment depreciation, and labor.

This Grain Drying Cost Calculator estimates the total drying cost per bushel based on the number of moisture points removed, the energy cost per point, and the economic value of shrinkage. Shrink is a real cost because the bushels you deliver after drying weigh less than the bushels you harvested — you lose sellable weight when removing water.

Understanding your drying cost helps you make better harvest timing decisions (harvest early and dry, or wait for field drying?), negotiate fair drying charges at commercial elevators, and evaluate investments in on-farm drying and storage systems.

When This Page Helps

Many producers underestimate drying costs by looking only at the propane bill and ignoring shrinkage, which can be the larger component. This page helps compare on-farm drying against elevator charges and judge whether waiting for additional field drying is really worth the harvest risk.

How to Use the Inputs

1. Enter the initial harvest moisture percentage (e.g., 25% for corn).
2. Enter the target dry moisture percentage (e.g., 15% for safe corn storage).
3. Enter the energy cost per point of moisture removed per bushel.
4. Enter the grain price per bushel to value the shrink loss.
5. Optionally enter electrical cost and other overhead per bushel.
6. Review total drying cost per bushel, energy cost, and shrink cost separately.

Example Calculation

Tips & Best Practices

• LP propane at $1.50/gal typically costs $0.03–$0.05 per point per bushel for corn depending on dryer efficiency.
• Shrink is often 50–60% of total drying cost — don't ignore it when comparing drying methods.
• Each day of warm, dry fall weather can remove 0.5–1 moisture point through field drying at zero energy cost.
• Natural air drying systems cost less energy per point but work only in suitable weather conditions.
• Compare your on-farm drying cost against commercial elevator drying charges to find the cheapest option.
• High-efficiency continuous flow dryers cost less per point than older batch dryers.

Understanding Your Drying Cost Components

Total drying cost has three main components. Energy is the most visible — the propane or natural gas bill that arrives after harvest. But shrink is often a larger cost because it represents actual grain that you harvested but cannot sell. The third component is overhead: dryer depreciation, electrical power for fans, labor, and maintenance.

When all three are combined, drying cost frequently reaches $0.08–$0.12 per bushel per point of moisture removed. On corn harvested at 25% and dried to 15%, that's $0.80–$1.20 per bushel — a significant expense when corn prices are $4–$6/bu.

On-Farm vs. Commercial Drying

On-farm drying gives you control over timing and cost but requires capital investment in equipment. Commercial elevator drying is convenient but typically charges a premium above actual cost, especially through aggressive shrink factors. Many elevators apply 1.3–1.5% shrink per point when actual physical shrink is only about 1.18%.

Harvest Timing Strategy

The drying cost calculator helps inform harvest timing. Every extra day of warm, windy fall weather can remove 0.5–1 moisture point at zero energy cost. But delayed harvest risks stalk lodging, ear drop, wildlife damage, and early snowfall. Use the calculator to determine your drying cost at different moisture levels and compare that against the estimated risk and field losses of waiting.

Frequently Asked Questions

• What is moisture shrink?

  When you remove moisture from grain, the grain loses weight because the water evaporates. Shrink is the percentage of weight lost. If you start with 1,000 bushels at 25% moisture and dry to 15%, you lose approximately 11.8% of the volume — you end up with about 882 bushels of dry grain. The lost 118 bushels represent real economic value.

• How is shrink calculated?

  The standard formula is: Shrink% = (Initial moisture − Target moisture) / (100 − Target moisture) × 100. This accounts for the fact that you're removing a percentage of the total weight, not just the moisture content. The divisor (100 − Target%) converts the moisture removal into a weight-loss percentage.

• Should I harvest early and dry, or wait for field drying?

  It depends on weather risk, field losses, and drying costs. Early harvest avoids stalk lodging, ear drop, and weather damage but incurs drying costs. Waiting reduces drying cost but increases harvest risk. Often, the break-even is around 2–3 moisture points — if field drying will take more than a week to save those points, the risk usually isn't worth it.

• What does it cost to dry corn with propane?

  At $1.50/gal propane, energy cost is roughly $0.03–$0.05 per point per bushel. At $2.00/gal, it rises to $0.04–$0.07/pt/bu. Dryer efficiency varies — newer continuous flow dryers are more efficient than older batch in-bin systems.

• How do commercial elevator drying charges work?

  Most elevators charge a flat fee per point of moisture removed, typically $0.04–$0.07/pt/bu. Some also apply shrink at 1.2–1.5% per point (exceeding the actual physical shrink). Always compare the elevator's total cost to your on-farm cost, including their shrink factor.

• Can I dry grain with natural air?

  Yes, natural air (or low-temperature) drying uses fans to push ambient air through grain in a bin. It's much cheaper on energy (electricity for fans only) but requires suitable weather conditions (cool, dry air) and more time. It works best for removing 3–5 points of moisture in fall conditions.