The corn's coming out wetter than you hoped. The dryer's running, propane's moving, and the number on your mind is whatever the fuel bill is going to be this year.

Fuel is the big one, no argument there. But the full cost of getting corn from harvest moisture down to a storable or salable level runs deeper than the propane tank. Electricity, equipment wear, labor, handling, and shrink all factor in, and together they change what a bushel actually costs you to produce.

Grain drying cost per bushel isn't a single number you can look up. It depends on how wet the corn comes in, how dry you take it, your dryer's energy use, current fuel and electricity prices, and how many bushels you run through the system. Here's how to work through the full cost using numbers from your own operation.

What Should Grain Drying Cost Per Bushel Include?

A complete grain drying cost may include:

• Fuel
• Electricity
• Labor
• Grain handling
• Repairs and maintenance
• Dryer ownership
• Interest and depreciation
• Moisture shrink
• Dry-matter or handling loss
• Transportation or commercial drying charges

The exact calculation depends on the decision you’re making. For a complete cost-of-production budget, include both ownership and operating costs. For an immediate decision between using equipment you already own and delivering wet grain, focus closely on the costs that change between those two options.

What Belongs in Your Corn Drying Cost?

Drying cost is really several costs stacked together. Here's what goes into it.

Fuel

The largest piece for most high-temperature systems. Propane or natural gas does the heavy lifting of removing moisture, and the more points you pull, the more you burn.

Iowa State Extension pegs fuel use at about 0.018 gallons of liquid propane per point of moisture, per bushel for high-temp systems, with a range of 0.010 to 0.025 gallons depending on your setup, the weather, and how efficiently the dryer runs. Review Iowa State’s corn drying cost guidance.

Electricity

Powers the fans, motors, and augers. Smaller than fuel on a high-temp dryer, but real, and it's the main energy cost on a natural-air system where the fans run for weeks. ISU's planning figure is roughly 0.01 kilowatt-hour per moisture point, per bushel for a high-temp system.

Labor and Handling

Someone has to run the dryer, move grain in and out, and deal with it when something plugs up at 9 p.m. ISU uses a nominal $0.01 per bushel for grain handling, with labor figured separately based on how much monitoring your system needs.

Repairs and Maintenance

Dryers wear. ISU suggests estimating annual repairs at about 3% of what the system cost to put in, spread across the bushels you dry. Some years it's nothing, some years it's a bearing and a belt and a service call.

Dryer Ownership, Interest, and Depreciation

Even a paid-off dryer costs you. The purchase price, augers, wiring, and concrete get spread across the system's useful life (ISU figures 20 to 25 years is reasonable) and your annual volume. Divide that yearly ownership cost by the bushels you run, and you've got a per-bushel number that climbs the fewer bushels you push through.

Moisture Shrink and Dry-Matter Loss

Pull water out of corn and it weighs less, so you end up with fewer 56-pound bushels than you started with. Most of that is just water leaving, which matters for your bushel count but isn't the same as losing dry corn. A smaller slice is actual dry-matter loss from breakage and respiration. More on that difference below, because it's where a lot of people get turned around.

Commercial Drying Charges and Discounts

Deliver wet and let the buyer dry, and you're paying their drying charge and shrink schedule instead of your own fuel bill. Those terms vary by buyer and change year to year, so ask for the current schedule before harvest instead of going off last year's.

Start With the Moisture Points You Need to Remove

Every drying calculation starts with how much water you're taking out.

Corn coming in at 20% moisture and going down to 15% means you’re removing five points. Worth being clear on one thing: that's five percentage points, not a 5% reduction. Every one of those points costs fuel, electricity, and weight.

Your target matters too. Drying to 15% for delivery is different from taking it down to 13% or 13.5% for long-term storage. Those extra points burn more fuel and add more shrink, so set your target based on how the corn will actually be stored and sold.

A Grain Drying Cost Per Bushel Example

Here's a hypothetical example with round numbers to show how the pieces fit. Every figure is illustrative, not a typical or guaranteed cost. Swap in your own energy prices and your dryer's real performance.

Hypothetical Assumptions

• Corn harvested at 20% moisture
• Target moisture of 15%
• Five moisture points removed
• Fuel use of 0.018 gallons of LP per point, per bushel
• Propane at $1.50 per gallon
• Electricity use of 0.01 kWh per point, per bushel
• Electricity at $0.14 per kWh
• Handling at $0.01 per bushel

In this example, fuel, electricity, and handling come to about 15 cents per wet bushel.

That figure doesn't include labor beyond basic handling, repairs, dryer ownership, interest, depreciation, transportation, moisture shrink, or dry-matter loss. Add those separately from your own records.

It's also calculated per wet bushel, meaning the bushels as they came off the field before shrink. Wet bushels and the marketable dry bushels you actually get paid for are two different numbers, and mixing them up will throw off everything downstream.

Reusable Grain Drying Cost Formula

Then add labor, repairs, ownership, transportation, and shrink for the full picture.

Why Shrink Needs Its Own Line

Shrink trips a lot of people up, so it's worth being precise.

When corn dries, water leaves the grain. That drops the total weight, which means fewer 56-pound bushels remain. That's water-weight shrink, and it's most of what a shrink calculation captures. It reduces the number of marketable bushels remaining, but it isn't the same as losing that percentage of dry corn matter. It still belongs in the calculation because it affects the quantity you can sell.

A smaller portion is actual dry-matter or handling loss, meaning sellable corn lost through kernel breakage, respiration, and the escape of volatile compounds. Iowa State cites measured handling losses of 0.064% to 1.33% at commercial facilities and 0.22% to 1.71% at farm-based facilities. Those ranges don't predict the loss on any one operation, but they show why dry-matter loss should be kept separate from water-weight shrink.

Then there's the buyer's contractual shrink factor, a number written into their purchase terms that's meant to cover both the water and an assumed handling loss. The exact factor is a policy choice, and it varies from buyer to buyer.

Three different things worth keeping straight:

1. The water weight removed during drying
2. The small, real dry-matter or handling loss
3. The shrink factor the buyer applies

Don't treat every bushel a shrink calculation removes as destroyed corn. Most of it is water you were never going to sell. It still affects how many marketable bushels you end up with, so it belongs in the math, just for the right reason.

On-Farm Drying vs. Commercial Drying

There's no universal answer to whether it's cheaper to dry your own corn or let the buyer do it. It depends on your equipment, your fuel prices, the buyer's terms, and the year.

If You're Delivering Wet, Look At:

• The buyer’s drying charge
• The buyer’s moisture discount
• The contractual shrink factor
• The moisture level used in the calculation
• Additional quality discounts or fees
• Transportation and delivery timing

If You're Drying Corn on the Farm, Compare:

• Fuel
• Electricity
• Labor
• Handling
• Repairs tied to use
• Additional transportation
• Moisture and dry-matter shrink

One thing worth knowing: if you already own the dryer and you're just deciding between running it and delivering wet, your fixed ownership costs don't change between those two options. In that case, the variable costs and the difference in net grain revenue are what deserve the closest look.

For a full cost-of-production budget, though, you'd still account for ownership, depreciation, interest, and insurance.

Drying your own corn may also affect where and how long you store it. Use your actual drying and storage costs, along with your buyer's current charges and shrink schedule, to compare the complete financial picture.

Related: On-Farm Storage vs. Elevator Storage: What It Really Costs Per Bushel

How Drying Costs Change Your Break-Even

Drying is a cost of production, so it moves your break-even. The trick is keeping your units straight. Don't add a cost figured per wet bushel directly onto a break-even figured per marketable dry bushel.

The cleanest way is to add drying to your cost per acre first:

Then recalculate:

Another option is to spread the total drying expense across the marketable bushels remaining after drying:

You can then add that adjustment to a break-even calculated on the same marketable-bushel basis.

How much drying changes the number also depends on whether drying was already included in your original budget. If it was, you’re replacing an estimate with an actual expense rather than adding an entirely new cost.

The effect will also vary by year. A dry fall in which little corn needs artificial drying looks different from a wet fall in which nearly every bushel goes through the dryer.

Related: Cost of Production 101: Three Hidden Costs Most Farmers Miss

What Drying Costs Mean for a Grain-Marketing Decision

Once you know what drying costs your operation, you've got better context for every marketing option in front of you.

A wet delivery bid and a dry delivery bid aren’t the same offer. A wet bid gets reduced by drying charges, moisture discounts, and shrink. A dry bid assumes you have already paid to bring the corn to the buyer’s acceptable moisture level.

To compare them fairly, figure the expected net revenue under each instead of just eyeballing the posted bids.

Drying cost may also affect:

• Storage decisions
• Harvest and delivery timing
• Cash-flow needs
• Your updated corn break-even
• The price needed to protect a target margin

It can even factor into whether you let corn dry longer in the field or run it through the dryer, but that call is about a lot more than propane. Stalk quality, lodging, field loss, weather, hybrid, and dryer capacity all weigh in, and those vary by field and season. Treat drying cost as one input, not the whole decision.

Related: Use the Pre-Harvest Grain Marketing Checklist for Corn and Soybean Farmers

Track the Cost While Harvest Is Still Fresh

The numbers you need are easiest to grab while the dryer's running and the records are right in front of you. By January, too many of them are guesses.

Write these down this fall:

• Bushels dried
• Starting and ending moisture
• Propane or natural gas used
• Electricity used
• Fuel and electricity prices
• Labor hours
• Repairs
• Dryer throughput
• Buyer drying charges
• Buyer shrink schedules
• Variable drying cost per wet bushel
• Estimated full cost per marketable bushel

Capture these now and next year's budget starts from something real instead of a rough memory of whether harvest felt expensive.

Keep Drying Costs Connected With the Rest of Your Farm Numbers

Drying costs are most useful when they don't stay stuck in a fuel receipt, a dryer log, or a separate spreadsheet.

Using farm budgeting software to keep harvest expenses with the rest of your cost-of-production information can make it easier to update per-acre costs, projected margins, and break-even prices after harvest.

roots helps keep budgeting, cost-of-production, grain-marketing, and pass-level cost information connected, so this fall’s actual numbers can improve next year’s plan.

Crop Ops supports multi-year farm budgets and lender-ready reporting. Cost Per Pass helps organize fuel, labor, and equipment costs by field activity. Crop Marketing gives those production numbers additional context when you’re evaluating prices and marketing targets.

The point is to have the numbers you collect at harvest ready when you're building next year's budget, checking your break-even, or deciding what price works for your farm.

This article is for general educational purposes. The example uses hypothetical prices and planning assumptions to illustrate the calculation. Energy use, shrink, commercial charges, grain quality, equipment performance, and buyer terms vary. Confirm current drying charges and shrink schedules with your buyer, use records from your own equipment when you can, and review major financial decisions with a qualified adviser.

Frequently Asked Questions About Grain Drying Cost Per Bushel

How do I calculate grain drying cost per bushel?

Subtract your target moisture from the corn’s harvest moisture to determine the moisture points removed. Multiply those points by your dryer’s fuel use per point and current fuel price. Add electricity, labor, handling, repairs, equipment ownership, and the financial effect of shrink for a more complete cost.

How much propane does it take to remove one point of moisture from corn?

Iowa State Extension offers an average planning estimate of 0.018 gallons of LP per moisture point removed per bushel for a high-temperature drying system, with a reported range of 0.010 to 0.025 gallons. Actual consumption depends on the system, weather, incoming moisture, and operating efficiency.

What’s the difference between drying cost per wet bushel and per dry bushel?

Drying cost per wet bushel uses the bushels measured before moisture is removed. Cost per dry or marketable bushel spreads the expense across the bushels remaining after drying and shrink. Use the same bushel basis when comparing drying costs with break-even prices or net grain bids.

Does grain shrink count as a drying cost?

Shrink affects the number of marketable bushels remaining after drying. Most moisture shrink is the predictable loss of water weight. A smaller portion may be actual dry-matter or handling loss. A buyer may also apply a contractual shrink factor as part of its grain-purchase terms.

Is it cheaper to dry corn on the farm or at the elevator?

It depends on your dryer's energy use, current fuel and electricity prices, labor, transportation, and the buyer's drying and shrink terms. Figure the expected net revenue under both options using current numbers from your operation and your buyer before you decide.

How do drying costs affect my corn break-even?

Drying adds to your cost of production. Add the allocated drying expense to your cost per acre, and then divide that updated cost by your expected marketable bushels per acre. Be sure the drying expense and break-even use a consistent bushel basis.

What records should I keep from the dryer?

Bushels dried, starting and ending moisture, fuel and electricity used, your energy prices, labor hours, repairs, dryer throughput, and your buyer's drying and shrink schedules. Capturing these during harvest gives you a real cost per bushel and a much better starting point for next year's budget.

Can farm budgeting software help track grain drying costs?

Farm budgeting software can help keep drying expenses with other production costs so they’re reflected in cost-per-acre, cost-per-bushel, margin, and break-even calculations. The result is only as accurate as the fuel, electricity, labor, repair, volume, and shrink information entered.

Can roots help me track harvest costs?

Yes. roots keeps budgeting, cost-of-production, grain-marketing, and pass-level cost information connected. CropOps supports multi-year budgets and lender-ready reporting, and Cost Per Pass organizes fuel, labor, and equipment costs for harvest and your other field passes.