Machinery Cost & Know Your Real Cost per Acre
Costs tillage
Round-number cost estimates hide the truth — enter the implement, width, speed and field efficiency with your fuel, labor and ownership to get the effective field capacity and all-in cost per acre, built on ASABE D497 values.
Set the implement & field
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Next: budget $5.61/ac for this pass and plan on 148.4 ac/day — your 160 ac take about 1.08 working day. Compare this against a custom-hire quote to decide own-vs-hire.
Capacity from ASABE EP496 (EFC = speed × width × efficiency ÷ 8.25). Fuel ≈ 0.044 gal per PTO-hp·hr (ASABE D497 full-load average). Repair from the ASABE D497 accumulated R&M curve. Ownership is your own depreciation+interest+insurance figure.
Field capacity & cost — key facts
- EFC (ac/hr)
- speed × width × eff ÷ 8.25
- TFC (ac/hr)
- speed × width ÷ 8.25
- Cost / acre
- (fuel+labor+repair+ownership) ÷ ac/hr
- Fuel (diesel)
- ≈ 0.044 gal per PTO-hp·hr
- Repair (R&M)
- RF1 × (h÷1000)^RF2 × list price
- Acres / day
- EFC × working hours/day
- Defaults source
- ASABE D497.7 Tables 1–2 · EP496.3
- Privacy
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ASABE D497 reference — field efficiency, speed and repair factors by implement
These are the embedded defaults the tool pre-fills when you choose an implement. Typical and range field efficiency and field speed are from ASABE D497.7 Table 1; repair factors RF1/RF2 and wear-out life from Table 2.
| Implement | Field eff. typical (range) | Speed mph typical (range) | RF1 | RF2 | Life (h) |
|---|---|---|---|---|---|
| Moldboard plow | 85% (70–90%) | 4.5 (3–6) | 0.43 | 1.8 | 2,000 |
| Chisel plow | 85% (70–90%) | 5.5 (4–7) | 0.28 | 1.4 | 2,000 |
| Disk harrow | 85% (70–90%) | 5 (3.5–6.5) | 0.18 | 1.7 | 2,000 |
| Tandem disk | 82% (70–90%) | 5.5 (4–7) | 0.18 | 1.7 | 2,000 |
| Field cultivator | 85% (70–90%) | 6 (5–8) | 0.27 | 1.4 | 2,000 |
| Rotary tiller | 80% (70–90%) | 3 (1–4.5) | 0.36 | 2 | 1,500 |
| Row-crop planter | 65% (50–75%) | 5.5 (4–7) | 0.32 | 2.1 | 1,500 |
| Grain drill | 70% (55–80%) | 5 (4–7) | 0.32 | 2.1 | 1,500 |
| Boom sprayer | 65% (50–80%) | 6.5 (3–12) | 0.41 | 1.3 | 1,500 |
| Fertilizer spreader | 70% (60–80%) | 6 (4–9) | 0.63 | 1.3 | 1,200 |
| Mower-conditioner | 80% (75–85%) | 5 (3–6) | 0.18 | 1.6 | 2,500 |
| Rotary mower | 80% (75–85%) | 5 (4–7) | 0.44 | 2 | 2,000 |
| Wheel rake | 80% (70–85%) | 6 (4–8) | 0.17 | 1.4 | 2,500 |
| Round baler | 75% (55–80%) | 5 (3–7) | 0.43 | 1.8 | 1,500 |
| Grain combine | 70% (60–80%) | 3.5 (2–5) | 0.12 | 2.3 | 3,000 |
Source: ASABE Standard D497.7 (Mar 2011, R2015) Tables 1 & 2; ASABE EP496.3 economic framework. Defaults are starting points — override with your own measured width, speed and efficiency.
Every per-acre cost line is divided by acres per hour
The single most important number in field machinery economics is effective field capacity — acres worked per hour. It is speed × width × field efficiency ÷ 8.25, and it sits in the denominator of every cost line. Fuel, labor, repair and ownership are all charged per hour, so dividing each by acres per hour turns them into cost per acre. Lift acres per hour and every cost line falls together; let it slip and they all rise.
This tool reports the effective field capacity, all-in cost per acre, acres per day and fuel use from ASABE D497 defaults you can override. Use it to budget each field pass, decide whether to own or hire, size a tractor to an implement, and value the efficiency you lose to overlap and short headlands. Pair it with the Enterprise Mix Gross Margin and Grain Storage Carry tools for a full farm-finance picture.
Real cost, not round numbers
ASABE D497 efficiency, speed and fuel by implement.
Own vs hire in one number
Compare all-in cost per acre to a custom-hire rate.
Plan the field window
Acres per day and days to cover the whole field.
Find the efficiency leak
Flagged against the ASABE typical band for the implement.
Frequently Asked Questions
How is effective field capacity calculated?+
Effective field capacity (EFC) in acres per hour is speed × width × field efficiency ÷ 8.25, where speed is in mph, width is in feet and efficiency is a fraction. The 8.25 constant converts mph·ft to ac/hr (43,560 ft² per acre ÷ 5,280 ft per mile). For example a 24 ft field cultivator at 6 mph and 85% efficiency covers 6 × 24 × 0.85 ÷ 8.25 ≈ 14.8 ac/hr. The theoretical capacity at 100% efficiency would be 17.5 ac/hr, so the lost time costs about 2.7 ac/hr.
What is field efficiency and why is it below 100%?+
Field efficiency is the fraction of time the implement is actually working the ground at full width. It is below 100% because of turning at headlands, overlap, refilling seed or spray, adjustments, and operator delays. ASABE D497 lists typical values: about 85% for tillage like plows and disks, 65–70% for planters and drills, 65% for sprayers and 70% for combines. Short, irregular fields and frequent refills drag it lower; long straight runs push it toward the high end.
How does the calculator work out cost per acre?+
It builds four cost lines, each divided by your effective field capacity. Fuel: diesel gal/hr (≈ 0.044 × PTO-hp at full load, per ASABE D497) × fuel price ÷ ac/hr. Labor: operator wage ÷ ac/hr. Repair and maintenance: from the ASABE D497 accumulated R&M curve for that implement. Ownership: your depreciation, interest, housing and insurance per hour ÷ ac/hr. The four add to the all-in cost per acre, which is the figure to compare against a custom-hire quote.
Where do the implement defaults come from?+
Every implement default — typical and range field efficiency, typical and range field speed, repair factors RF1 and RF2 and wear-out life — comes from ASABE Standard D497.7 "Agricultural Machinery Management Data" Tables 1 and 2. The capacity and ownership framework follows ASABE EP496.3. The tool pre-fills these when you pick an implement, and you can override any of them with your own measured numbers.
How is fuel use estimated?+
Diesel fuel use is taken as the ASABE D497 full-load average of about 0.044 gallons per PTO-horsepower-hour. So a tractor delivering 120 PTO-hp at full load burns roughly 5.3 gal/hr. Divided by acres per hour that gives gallons per acre, which the tool also converts to litres per hectare. Light draft operations use less than full load, so treat the fuel figure as a sensible upper-bound for planning.
What is the difference between effective and theoretical field capacity?+
Theoretical field capacity (TFC) is what the implement would cover if it never stopped and never overlapped — speed × width ÷ 8.25. Effective field capacity (EFC) multiplies that by field efficiency to account for real turning, overlap and downtime. The gap between them is pure lost capacity; closing it by lifting efficiency is usually cheaper than buying a wider machine or more horsepower.
How is the repair and maintenance cost figured?+
ASABE D497 models accumulated repair and maintenance as a fraction of list price: ARM = RF1 × (hours ÷ 1000)^RF2 × list price, where RF1 and RF2 are implement-specific factors. The tool evaluates that at the hours already on the machine, converts it to a cost per hour over the elapsed life, then divides by acres per hour to get repair cost per acre. Older machines with more accumulated hours show a higher repair line.
Should I own this machine or hire it custom?+
Compare the all-in cost per acre the tool reports against a local custom-hire rate for the same operation. If your own cost per acre is well above the custom rate and you cover few acres, hiring is usually cheaper because ownership cost is spread over too little work. If your cost per acre is at or below the custom rate, owning pays — and running more acres per machine lowers it further by diluting fixed ownership cost.
How do I cut my cost per acre?+
The biggest lever is acres per hour, because every cost line is divided by it. Lift field efficiency with longer straighter runs, less overlap (guidance or markers) and faster refilling; that is the cheapest capacity you can buy. Sizing the tractor to the implement avoids burning fuel on idle horsepower. Spreading ownership over more acres each season lowers the ownership line. Adding width or speed helps only if efficiency holds.
What is drawbar horsepower and why does it matter?+
Drawbar horsepower is the power actually delivered to pull the implement, after losses through the wheels. ASABE puts the PTO-to-drawbar efficiency near 0.86 on firm soil with rubber tyres, so the tool reports about 86% of PTO power as drawbar power used. It is a guide to whether your tractor is well matched: heavy draft implements need more drawbar power than light ones at the same PTO rating.
Does this work in metric (hectares and litres)?+
Yes. The tool reports effective field capacity in both ac/hr and ha/hr, and fuel in both gal/ac and L/ha, so metric and US users get native figures. The underlying balances are unit-consistent — you can read whichever set matches your records and the per-acre cost converts directly to per-hectare by multiplying by about 2.47.
How many acres can I cover in a day?+
Acres per day is simply effective field capacity × available working hours per day. A 14.8 ac/hr field cultivator over a 10-hour day covers about 148 acres; a 320-acre field then takes a little over two working days. The tool shows both acres per day and the number of working days for your entered field area, which is useful for planning planting or spray windows against the weather.
Why is per-acre cost so sensitive to field efficiency?+
Because efficiency sits in the denominator of every cost line. Dropping from 85% to 65% efficiency on the same implement cuts acres per hour by nearly a quarter, which raises fuel, labor, repair and ownership cost per acre by the same proportion. That is why the tool flags your efficiency against the ASABE typical band — recovering lost efficiency lowers all four cost lines at once, for free.