What a break-even price actually tells you
A break-even price is your cost of production expressed per bushel instead of per acre. It is the single most useful number in grain marketing, because a cash bid means nothing until you can compare it against what the bushel cost you to grow. A $4.50 bid is excellent at $3.20 of cost and ruinous at $5.10.
The conversion is a division, and the two halves of it behave completely differently. Cost per acre is largely locked in by planting time: the seed is bought, the fertilizer is applied, the rent is signed. Yield is not known until the combine runs. So cost per bushel is dominated by yield risk, and that is why the calculator shows you a whole range of yields rather than a single figure. A budget of $800 an acre is $4.00 a bushel at 200 bushels, $5.33 at 150 bushels and $3.20 at 250. The cost did not move; the denominator did.
Two break-even prices matter, not one, and the distinction is the whole point of separating variable from fixed costs. Variable costs — seed, fertilizer, chemical, fuel, repairs, drying, operating interest — you incur only by planting the crop. Fixed costs — machinery depreciation and interest, cash rent, insurance, overhead, your own management — arrive regardless. The full-cost break-even is what the enterprise must earn to be worth continuing. The variable-cost break-even is the floor below which planting an acre makes your loss bigger rather than smaller.
This is the standard enterprise budget structure used by USDA's Economic Research Service in its commodity costs and returns accounts and by every land-grant university extension budget. Using the same structure means your numbers can be compared with theirs line by line, and a line that is far out of step is a question worth asking.
Building the budget, line by line
The arithmetic is trivial. The judgement is in what goes into each line, and there are four places where budgets go wrong.
Charge yourself rent on owned land. If you farm 400 owned acres and 600 rented, and you enter zero for the owned ground, the owned acres will look brilliantly profitable and you will draw the wrong conclusion about which acres to expand. Enter the rent you could collect if you let the ground instead. That opportunity cost is what makes owned and rented acres comparable, and it is what the cash rent calculator exists to estimate.
Separate machinery operating cost from machinery ownership cost. Fuel, oil, filters, parts and tyres scale with hours run, so they belong in variable costs; the fuel cost per acre calculator derives them from field capacity and horsepower. Depreciation, interest on the machinery investment, insurance and shed space belong in fixed costs. Combining them destroys the variable-cost break-even, which is the number you need in exactly the year you are least able to think clearly.
Charge your own labour and management. Unpaid family labour is not free; it has an opportunity cost, and a budget that ignores it will show a profit that is actually a below-market wage. Put a rate on the hours and put a management charge in overhead.
Use a realistic yield, entered as dry bushels. The single largest error in farm budgets is optimism about yield. Use your actual production history rather than your best year. And enter dry bushels at market moisture: wet bushels off the combine shrink as they dry, and the moisture shrink calculator shows by how much. Budgeting on wet bushels overstates the denominator and understates your cost per bushel.
Once the lines are right, the three outputs come straight out. Break-even price is net cost divided by yield. Break-even yield is net cost divided by price. Profit per acre is price times yield plus other income minus total cost — and note that profit equals yield times the gap between the price and the full-cost break-even, which is why a small move in break-even price is a large move in profit on a high-yielding field.
Worked example: 1,000 acres of corn at 200 bu/ac
Take a corn budget of the shape most Corn Belt operations recognise. Work through the two break-evens by hand.
- Variable costs. Seed $100 + fertilizer $150 + crop protection $50 + fuel, repairs and labour $60 + drying, hauling, insurance and operating interest $40 = $400 per acre.
- Fixed costs. Machinery ownership $100 + land charge $250 + overhead and management $50 = $400 per acre.
- Total cost. 400 + 400 = $800 per acre.
- Break-even price, full cost. $800 ÷ 200 bu = $4.00 per bushel.
- Break-even price, variable cost. $400 ÷ 200 bu = $2.00 per bushel.
- Break-even yield at $4.50. $800 ÷ $4.50 = 177.8 bu per acre.
- Profit per acre. ($4.50 × 200) − $800 = $900 − $800 = $100 per acre, which on 1,000 acres is $100,000.
- Margin over variable cost. $900 − $400 = $500 per acre, the amount available to pay the $400 of fixed costs.
Now stress it. Drop the yield to 170 bushels, one bad August, and the break-even price rises to $800 ÷ 170 = $4.71. At the same $4.50 bid the field now loses $35 an acre, or $35,000 across the crop — a $135,000 swing from a 15 percent yield miss. Alternatively hold 200 bushels and let the price fall to $3.75: profit becomes $750 − $800 = −$50 an acre. In both cases the margin over variable cost stays comfortably positive, which is the signal that the crop is still worth harvesting and selling even though it is not paying for the farm.
How to act on the two break-even prices
Compare the market price against both break-evens, and the answer falls into one of three zones.
Price above the full-cost break-even. Every cost in the budget is covered. This is the zone to be selling in, and the practical use of the number is as a marketing trigger: a target price set at break-even plus a margin you have decided in advance beats a target set by how you feel about the weather.
Price between the two break-evens. The crop pays for its inputs and contributes something toward fixed costs, but not all of them. This is a normal short-run position after a poor year, and the right response is usually to keep farming and to attack the fixed cost line — renegotiate rent, extend machinery replacement intervals, spread iron over more acres — rather than to cut inputs that are still paying for themselves.
Price below the variable-cost break-even. Each acre planted makes the loss larger than not planting it. This is the point at which the acre stops being a marketing problem and becomes an enterprise decision: a different crop, prevented planting, forage, or letting the ground go. It is rare in grain and it is the reason to keep variable and fixed costs separate all year.
Two cautions on how far to trust the figure. First, the break-even price is a per-acre average, and averages hide variation: a farm with 50 bushel spread between its best and worst fields has fields on both sides of the line even when the whole-farm number looks fine. Run the sensitive fields separately. Second, other income shifts the break-even but does not remove the risk — a programme payment or insurance indemnity that arrives after harvest lowers the price you need but does not help you make a decision in April, which is why the default here is zero.
Finally, revisit the yield input against reality as the season progresses. An in-season estimate from the corn yield estimate calculator is far better than the pre-plant APH once the ears are set, and it moves the break-even price more than any input cost you can still change.
Break-even price per bushel by total cost and yield
| Total cost per acre | 150 bu/ac | 175 bu/ac | 200 bu/ac | 225 bu/ac | 250 bu/ac |
|---|---|---|---|---|---|
| $600 | 4.00 | 3.43 | 3.00 | 2.67 | 2.40 |
| $700 | 4.67 | 4.00 | 3.50 | 3.11 | 2.80 |
| $800 | 5.33 | 4.57 | 4.00 | 3.56 | 3.20 |
| $900 | 6.00 | 5.14 | 4.50 | 4.00 | 3.60 |
| $1,000 | 6.67 | 5.71 | 5.00 | 4.44 | 4.00 |
Every cell is cost ÷ yield with no other income credited. Read across a row to see how much yield risk is worth: on a $800 budget, moving from 200 to 175 bushels adds 57 cents a bushel to the price you need.
Why the variable-cost break-even is so much lower than it feels
In the example above the variable-cost break-even is $2.00 against a full cost of $4.00, because half the budget is land, iron and overhead. That gap is not a sign the budget is wrong; it is a measure of how capital-intensive the operation is. A farm with cheap rent and old machinery has a narrower gap and less room to absorb a bad price. A farm carrying high rent and new equipment has a wider gap, which means more of its cost is committed before a seed goes in the ground and less of it can be avoided by not planting.
Assumptions and limits worth knowing
- It is a single-crop, single-year budget. Rotational effects — nitrogen credit from soybeans, weed pressure carried into next year, the cost of a cover crop that pays off later — sit outside it.
- It uses one average yield. Real yields are a distribution, and the average yield does not give the average profit once crop insurance and price contracts are in the picture, because those payoffs are not linear in yield.
- Fertilizer is charged to the crop that receives it. If you build soil test levels for future years, part of that spend belongs to those years, and the NPK requirement calculator helps split a build-up rate from a maintenance rate.
- Machinery ownership must be your cost, not a book figure. Depreciation on a tax schedule is not economic depreciation, and interest belongs in the budget even on equipment you paid cash for.
- Price is the net price at the point of sale. Deduct basis, drying, shrink and freight before you enter it, or the break-even will be met on paper and missed at the scale.
- Fixed costs per acre fall as acres rise, up to a point. If you are testing whether to take on more ground, recompute the machinery ownership and overhead lines across the new acreage rather than holding the per-acre figure constant.
Key terms
- Variable cost
- A cost incurred only because you planted the crop: seed, fertilizer, chemical, fuel, repairs, drying, hauling, crop insurance and interest on the operating loan. It disappears if the acre is not planted.
- Fixed cost
- A cost that arrives whether or not the crop is planted: machinery depreciation and interest, cash rent or land opportunity cost, farm insurance, utilities, buildings and management.
- Margin over variable cost
- Revenue minus variable cost per acre. It is the money available to pay fixed costs, and it is the figure that decides whether an already-planted crop is worth harvesting.
- Break-even yield
- The yield that covers cost at a given price. It is the mirror image of the break-even price and the more natural number to think in during the growing season, when the price is known and the yield is not.
- Opportunity cost of land
- The rent owned ground could earn if let to someone else. Charging it makes owned and rented acres comparable and stops owned land from hiding a weak enterprise.
Where the break-even fits in the rest of the farm's numbers
Break-even price answers one question — what a bushel must sell for — and hands off to several others.
Marketing plans. The break-even is the reference line for a written marketing plan: how many bushels to price at break-even plus a target margin, at what dates, and with what tools. Without it, price targets are guesses dressed as discipline.
Crop choice. Comparing corn against soybeans means comparing margin over variable cost per acre, not break-even price per bushel — the two crops' bushels are not the same thing. Build a budget for each and compare the profit per acre at your expected prices.
Machinery decisions. Ownership cost per acre is the link between the machinery line in this budget and the equipment shed. Spreading a machine over more acres lowers its cost per acre until timeliness losses set in, and the field capacity calculator is where that trade-off gets quantified.
Lending, programmes and insurance. A lender reads the variable cost line as the operating note requirement and the full cost line as repayment capacity, so a break-even sitting above the forward curve is the conversation to have in December rather than the following September. Programme payments and revenue insurance change the distribution of outcomes rather than the cost of production: model them as other income only when you have a firm figure, and otherwise keep them out of the break-even and treat them as the buffer they are.
For published benchmark budgets to check your lines against, USDA ERS maintains commodity costs and returns accounts by region, and most land-grant universities publish annual crop budgets for their states. Compare line by line rather than on the total: two budgets that agree at $800 per acre can disagree by $150 on rent and $150 on machinery in opposite directions, and that difference changes what you should do next.