Cost of production per hectare: how to calculate costs and profitability by field

Why field-level cost calculations matter

The cost of a whole crop across the farm tells you how much you spent on wheat. It does not tell you where that money earned its keep and where it was lost. Working per hectare lets you compare fields of different sizes, and working per tonne shows what it costs to produce the grain you intend to sell.

The field is the level at which many real decisions are made: what to grow, how much fertiliser to apply, and whether a rented parcel still makes economic sense. A whole-farm average can be useful for budgeting or finance, but it is often too broad for agronomic and operational decisions. Field-level costing shows where margin is actually being made or lost.

The second issue is timing. A calculation done after harvest from a folder of invoices is accurate, but late. If you collect costs during the season, you see what a hectare costs as you go and can still react, for example when deciding on another fungicide application.

Cost categories and where to get the data

The standard split is direct costs (inputs and services allocated straight to the crop), the cost of your own machinery and labour, and indirect costs, meaning general farm overheads. In this article contractor services count as direct costs, because you pay a specific invoice for a specific field. Some methodologies treat them differently, so what matters most is sticking to one convention every year.

Value inputs at the price actually paid, not at today’s list price. If two fertiliser deliveries were bought at different prices, the field cost depends on which batch was used. That is why inventory issues allocated to a field provide the most reliable basis for material costs.

How to calculate an hourly machinery rate

The hourly machinery rate is the cost of operating a machine for one hour. It combines fixed costs that exist whether the machine is working or not — depreciation, insurance, storage and the cost of capital — with variable costs such as fuel, oils, fluids and repairs. The operator’s hourly cost can be included as well.

Hourly machinery rate = (annual fixed costs ÷ annual working hours) + variable costs per hour + operator rate. A simple way to calculate depreciation is straight-line: (purchase price − residual value) ÷ years of use.

The cost of a given operation is the tractor rate plus the implement rate, multiplied by the working time. If a mounted sprayer costs 35 PLN/h and spraying takes 0.25 h/ha, the machinery cost of that pass is (218.50 + 35) × 0.25 ≈ 63 PLN/ha. That excludes the plant protection product, which you count separately.

The number of hours per year is the key figure. The same tractor at 400 h instead of 800 h has twice the fixed cost per hour. If you guess the hours, the rate is only an estimate. If you take them from work logs, you have a solid basis.

Labour and contractor services

The simplest approach is to include operator labour in the hourly machinery rate. Just make sure it is not counted again as a separate labour cost. Work performed away from the machine — scouting, preparing spray solution, loading or other manual tasks — should be recorded separately. On family farms, it is also worth assigning a cost to your own labour; otherwise field profitability can look better than it really is.

Contractor services are the simplest: an invoice for combining or drying has an amount and usually relates to a specific field. Comparing them with the cost of your own machine at its hourly machinery rate is a good test of whether buying the kit stacks up. If a contract combine costs less per hectare than your own at a realistic number of hours, the numbers speak for themselves.

Example: cost of producing 1 ha of winter wheat

Revenue: assume a yield of 8 t/ha and a price of 850 PLN/t, which gives 6,800 PLN/ha from sales. Show subsidies separately, for example 900 PLN/ha, because they do not depend on how well the field yielded and can mask weak production.

Gross margin tells you how much the crop earns towards machinery, labour and overheads. It is well suited to comparing crops in a rotation. The break-even point is more practical during the season: if you know the field loses money below 5.5 t/ha or 585 PLN/t, it is easier to judge whether another 150 PLN/ha application is likely to pay for itself.

Differences between fields, or why the average misleads

The same wheat crop can deliver a very different margin from one field to another. Using example figures: field A is 40 ha, yields 8.8 t/ha and costs 4,550 PLN/ha. Field B is 12 ha, yields 5.6 t/ha and costs 4,950 PLN/ha because it is farther from the farmyard, carries a higher rent and required an extra application. At 850 PLN/t, field A generates a margin of about 2,930 PLN/ha, while field B loses about 190 PLN/ha.

The weighted average for both fields looks respectable, so without a field-by-field breakdown the problem with field B would disappear in the summary. The most common sources of difference are travel (more machinery hours), land rent tied to a specific plot, extra applications and soil variability within the field. That last one can be reduced with variable rate fertilisation, which we cover in the article on variable rate application (VRA) maps.

Be careful with overheads. Spreading them evenly per hectare is simple and fair, but land rent is better allocated directly to the field it relates to. Otherwise owned land subsidises rented land and the picture gets blurred.

What to record during the season so the calculation does itself

Costing is only hard when the data has to be reconstructed after the event. If you record it as part of daily work, all that is left at the end of the season is adding it up. The minimum is:

• Every application: field, date, product or fertiliser, rate, area. This is the same data that record-keeping requires, so we cover it in more detail in the article on electronic spray records.
• Inventory issued to the field at purchase price. With inventory and AI invoice processing, a completed operation deducts the product from stock and allocates its value to that field.
• Work log: worker, field, machine, operation and working time. No hours, no machinery cost.
• Machinery rates set before the season and corrected once you know the annual hours.
• Service invoices allocated to a field.
• Yield from each field separately, even if only from weighing trailers.
• Selling price, or the price you use to value unsold stock in inventory.

In Nirby, these elements are connected: work records, inventory usage and machinery rates build the cost of each operation, while costs and revenue determine the profitability of each field and the farm as a whole. Cost of production analysis updates after every completed operation, so you can track margin per hectare throughout the season instead of waiting until after harvest.

Crop production sheet: review the season and plan the next one

A crop production sheet brings the season together in one place: each operation in chronological order, along with the date, machine, inputs and rates, working time and cost. It finishes with revenue, costs by category and the field margin. It can be used for planning, but it becomes much more useful when it is built from what actually happened in the field.

How to use it when planning the next season:

1. Compare the completed sheet with the pre-season plan. Unplanned operations show where the crop programme had to be adjusted.
2. Look at the share of each cost category. If machinery accounts for more than fertiliser, the best savings may come from reducing passes or working time rather than cutting rates.
3. Compare the same crop across different fields. Differences in machine hours and input use often explain profitability better than yield alone.
4. Recalculate the break-even point for the new season with current input prices and a realistic selling price.
5. On that basis, draw up the planned budget and compare it with what is actually done during the season.

In Nirby you generate the crop enterprise budget from the financial analysis as an Excel file, so you can work on it further, pass it to your adviser or attach it to documents for the bank.

Checklist: calculating farm production costs

• You calculate costs separately for each field, not just for the crop.
• You value inputs at purchase price, from inventory issues to the field.
• Every machine has a hourly machinery rate with fixed and variable costs.
• Machinery and labour hours come from work logs, not from memory.
• You do not count operator labour twice: in the hourly machinery rate and separately.
• You allocate overheads by one consistent rule, and assign rent to the field.
• You show subsidies separately from sales revenue.
• For every field, you know the gross margin, overall margin and break-even point.
• After the season, the completed crop production sheet becomes a practical starting point for next year’s plan.