Price is the first question in roughly half of the messages that reach our factory — several hundred of them a year, in every language. But the buyers who go on to order a second machine almost never ask “how much is it?” first. They ask a better question: how many kilos a month do I need to roast for this machine to pay for itself?
That is a question with a real answer, and you can work it out before you request a single quotation. This guide gives you the coffee roaster ROI maths we use with buyers: throughput per shift by machine size, the roasting loss most spreadsheets forget, contribution per roasted kilogram, and a payback table. We build roasters from 1 kg to 300 kg, so we would rather you size the machine correctly than buy one you cannot fill.
The Four Numbers That Decide Payback
Everything reduces to these:
- Installed cost — machine + freight and duty + ventilation and afterburner + electrical work + commissioning. Not the machine price alone.
- Realistic throughput — kilograms of roasted coffee your operators actually produce per shift, not the number on the nameplate.
- Contribution per roasted kilo — selling price minus green coffee, energy, packaging and direct labour.
- Months of demand you can actually sell — the number most first-time roasters get wrong in the optimistic direction.
For a breakdown of what drives the first number, see our commercial coffee roaster price guide; for the energy and consumables side, our running costs guide has gas and electricity figures by machine size.
Step 1: Roasting Loss — the 16% Nobody Budgets For
Green coffee loses weight in the roaster: moisture leaves, chaff leaves, and organic matter is driven off. Typical loss is 14–18%, around 16% for a medium roast. You buy green kilos; you sell roasted kilos.
Green cost per roasted kilo = green price ÷ (1 − loss)
Green at US$6.00/kg with 16% loss = US$7.14 per roasted kilo, not $6.00.
On 2,000 kg a month that mistake is over US$2,200 of imaginary margin. Build the loss into your model on day one.
Step 2: Realistic Throughput by Machine Size
Rated capacity is a maximum, not a working charge — most roasters run 70–80% of rated capacity for profile control. A full batch cycle (charge, roast, cool, clear) runs about 15–20 minutes, so plan on 3–3.5 batches per hour, and about 6 productive hours in an 8-hour shift once preheat, cupping, cleaning and packing are counted.
| Rated capacity | Working charge | Roasted kg / 6h shift | Roasted kg / month (20 shifts) |
|---|---|---|---|
| 1 kg | 0.8 kg | ~16 kg | ~320 kg |
| 3 kg | 2.2 kg | ~39 kg | ~780 kg |
| 6 kg | 4.5 kg | ~79 kg | ~1,580 kg |
| 12 kg | 9 kg | ~159 kg | ~3,180 kg |
| 30 kg | 22 kg | ~333 kg | ~6,660 kg |
| 60 kg | 45 kg | ~680 kg | ~13,600 kg |
Assumes 16% roasting loss, 3.2 batches per hour and one shift per day. A second shift roughly doubles the monthly figure without a second machine — often the cheapest capacity you will ever buy. Charge weights and why the window matters are covered in our batch size guide.
Step 3: Contribution Per Roasted Kilogram
A worked example for a wholesale roastery selling to cafés at US$14.00/kg:
| Line item | Per roasted kg | Note |
|---|---|---|
| Wholesale selling price | + $14.00 | Retail bags run far higher; cafés far lower per kg |
| Green coffee (loss-adjusted) | − $7.14 | $6.00 green ÷ 0.84 |
| Gas / electricity | − $0.35 | Higher with an afterburner running |
| Packaging (bag, valve, label) | − $1.20 | Assumes 1 kg wholesale bags |
| Direct labour | − $0.90 | Varies hugely by country |
| Consumables & spares | − $0.10 | Budget 1–2% of machine value per year |
| Contribution | ≈ $4.31 | Before rent, salaries, delivery and tax |
Read that last line carefully. Contribution pays back the machine. It does not pay your rent, your van or your own salary — those are separate, and they are why a roastery can have a fast machine payback and still lose money overall.
Step 4: The Payback Table
Payback in months = installed cost ÷ (monthly roasted kg × contribution per kg). Using $4.31 contribution and an illustrative installed project cost — machine, freight, duty, ventilation and install — of US$30,000 for a 12 kg line:
| Monthly roasted volume | Monthly contribution | Payback on $30,000 | Machine utilisation |
|---|---|---|---|
| 300 kg | $1,293 | 23 months | 9% — machine badly oversized |
| 800 kg | $3,448 | 9 months | 25% |
| 1,500 kg | $6,465 | 5 months | 47% — healthy |
| 3,000 kg | $12,930 | 2.3 months | 94% — plan the next machine |
Substitute your own selling price and green cost; the structure holds. Two observations we see repeatedly in real projects:
- The machine is rarely the constraint. Demand is. A roastery selling 300 kg a month does not have an equipment problem, it has a sales problem — and buying a bigger roaster makes it worse.
- Under-buying costs more than over-buying. Replacing a 3 kg machine with a 12 kg machine after 14 months means paying twice for freight, ventilation and installation. Buy for the volume you expect in 18–24 months, not the volume you have today.
The Costs First-Time Buyers Leave Out
| Item | Why it hits the ROI model |
|---|---|
| Ventilation, ducting, stack | Local sheet-metal work, often the largest non-machine line item |
| Afterburner or smoke filter | Mandatory in many urban zones; adds capital and gas cost |
| Freight, duty and VAT/GST | Paid at the port before you roast a single kilo |
| Electrical upgrade | Three-phase supply, breaker and cable sizing at your site |
| Working capital for green coffee | You pay for green months before customers pay you |
| Packaging equipment | Filling and sealing become bottlenecks above ~1,000 kg/month |
Our guide to a complete roastery equipment setup lists the ancillary machines in order of when you actually need them, and our guide to starting a coffee roasting business covers the licensing and site side.
Frequently Asked Questions
How long does it take for a commercial coffee roaster to pay for itself?
With a wholesale contribution of roughly US$4 per roasted kilogram, a mid-size installed line paying back US$30,000 needs about 1,500 kg a month to reach payback in five months, or 800 kg a month for nine months. Payback is driven far more by the volume you can sell than by which machine you buy.
How many kilos per day can a 12 kg roaster produce?
About 159 kg of roasted coffee in a productive 6-hour shift, assuming a 9 kg working charge, 3.2 batches per hour and 16% roasting loss. A second shift roughly doubles that without additional capital.
Is it cheaper to start small and upgrade later?
Usually not. Freight, ventilation, electrical work and commissioning are paid again on the second machine, and they are a large share of the installed cost. If you expect to pass 1,000 kg a month within two years, buy the larger machine now and run smaller batches until demand catches up.
What roasting loss should I use in my calculations?
Use 16% for a medium roast as a planning figure, 14% for light and up to 18–20% for dark. Weigh green in and roasted out for your own beans over ten batches and use your real number.
Can you tell me the price of a roaster before I decide?
Yes — we quote in writing against your capacity, fuel type, voltage and destination port, including packing and freight if you want a landed figure. We do not publish fixed list prices because the same machine costs differently once gas type, control level and shipping route are specified.
Get a Quote
Send us your target monthly volume and selling channel and our engineers will tell you which machine fits — including when we think you should buy smaller than you asked for. Browse the range of commercial coffee roasters, the popular 12 kg model, or the SD Series flagship line.
Request a written quotation through the enquiry form on our contact page, or message us and we will run your numbers with you:
WhatsApp our engineers: +86 184 0771 4607
Last updated: August 27, 2026