How to Choose the Right Coffee Roaster Size for Your Café

Choosing the wrong roaster size is one of the most expensive mistakes a coffee business can make. Go too small and you'll be roasting round-the-clock to keep up with demand. Go too large and you're sitting on an expensive machine that runs at 20% capacity.

This guide cuts through the confusion. We'll walk you through exactly how to calculate the right batch size for your operation — whether you're opening a specialty café, scaling a roastery, or building an industrial production line.

Step 1: Calculate Your Daily Green Bean Requirement

Start with your finished (roasted) coffee sales volume per day, then work backwards. On average, green beans lose 15–20% weight during roasting (the "roast loss"). So if you sell 10kg of roasted coffee per day, you need to roast approximately 12–12.5kg of green beans.

Step 2: Understand Batch Capacity vs. Hourly Output

The number on a roaster (e.g., "6kg") refers to the maximum batch capacity, not hourly output. A 6kg roaster doesn't produce 6kg every hour — it produces 6kg every roasting cycle (typically 12–15 minutes), plus cooling time.

Realistic hourly output = roughly 2.5–3× the batch capacity. A 6kg roaster typically outputs 18–28kg per hour when running continuously.

Machine Size	Batch Capacity	Realistic Output/hr	Best For	Yoshan Model
1kg	0.2–1.5kg	4–6 kg/hr	Home roasters, training, small café	DY-1KG — $2,599
3kg	2–3kg	8–12 kg/hr	Specialty café, origin sourcing lab	SD-3KG Pro — $8,889
6kg	3.5–7kg	18–28 kg/hr	Specialty roastery, café with wholesale	YS-6KG — $7,499
15kg	1–15kg	40–60 kg/hr	Commercial roastery, multi-café supply	YS-15KG — $10,999
30kg	25–38kg	90–120 kg/hr	Wholesale roastery, regional brand	SD-30KG Pro — $51,499
60kg+	60kg+	150kg+/hr	Industrial factory, national brand	SD-60KG Pro — $61,999

Step 3: Match Machine Size to Your Business Stage

🏠 Home Roaster / Just Starting Out

If you're learning to roast or supplying 1–2 cafés, a 1kg machine is the right starting point. You can experiment with profiles, make mistakes without wasting expensive green beans, and still produce enough for personal use or a small customer base.

Recommended: Yoshan DY-1KG ($2,599) — gas or electric, Artisan software compatible, free color customization.

☕ Specialty Café (in-house roasting)

A café selling 5–15kg of roasted coffee per day needs a 3kg to 6kg machine. This gives you enough output to roast fresh daily, serve in-store, and build a small retail/online customer base without overinvesting in a large machine.

Recommended: Yoshan YS-6KG ($7,499) — Siemens PLC, cast iron drum, free logo on the machine body. Most popular choice for specialty café owners worldwide.

🏭 Independent Roastery (wholesale + retail)

If you're supplying multiple cafés or running a subscription coffee brand, you likely need 15kg to 30kg capacity. At this scale, automation matters — look for PLC control systems and auto loaders to reduce labor costs and improve batch consistency.

Recommended: Yoshan YS-15KG ($10,999) or SD-15KG Pro ($16,999) — Siemens PLC, up to 80kg/hr output, free color and logo.

🏗️ Industrial / Factory Scale

National coffee brands and private label manufacturers typically need 30kg–300kg machines running multiple shifts per day. At this scale, you need full automation: auto loaders, destoners, afterburners, and Siemens-controlled production lines.

Recommended: Yoshan SD-30KG Pro ($51,499 full set) up to SD-360KG Pro ($289,999) — Weishaupt burner (same as Probat), full Siemens automation, free on-site engineer for Southeast Asia.

Step 4: Factor in Future Growth

One of the most common regrets we hear from roastery owners: "I wish I'd bought the next size up." Coffee businesses tend to grow faster than expected, and upgrading a roaster is expensive — you're not just buying a new machine, you're also spending on installation, gas line changes, and potentially new electrical infrastructure.

Our recommendation: if you're between two sizes, go one size up. A larger machine running at 60% capacity is more flexible than a smaller machine running at 100% — you can roast bigger batches when needed and still have room to grow into the machine over 1–2 years.

Step 5: Gas vs. Electric — What's Right for You?

Both gas and electric coffee roasters produce excellent results. The choice comes down to your venue:

• Gas roasters — faster heat-up, lower running cost per kg, traditional flavor profile. Require a gas line (LPG or natural gas).
• Electric roasters — no gas line needed, cleaner installation, better for locations where gas is unavailable. Higher electricity cost per kg but lower infrastructure cost.

Yoshan's DY and YS series both offer gas or electric options at the same price. The SD series 1.5–6kg Pro models also offer electric (requires 380V 3-phase power).

Common Mistakes to Avoid

• Buying based on max batch, not realistic output — always calculate hourly output including cooling and loading time.
• Ignoring voltage requirements — larger electric roasters (20kg+) require 380V 3-phase power. Confirm your venue's power supply before ordering.
• Forgetting accessories — a destoner ($1,299–$4,469), smoke filter ($1,500–$3,450), and auto loader ($1,199–$2,950) can make a major difference in quality and workflow. Bundle with your roaster for a 20% discount at Yoshan.
• Skipping after-sales support — for commercial machines, make sure your supplier offers a real warranty and technical support. Yoshan provides a 1-year standard warranty (extendable to 3 years) and a 24-hour after-sales team.

Summary: Quick-Reference Size Guide

Your Daily Need	Recommended Size	Yoshan Option	Price
Under 20kg/day	1–2kg roaster	DY-1KG or DY-2KG	$2,599–$3,399
20–60kg/day	6kg roaster	YS-6KG	$7,499
60–150kg/day	15kg roaster	YS-15KG or SD-15KG Pro	$10,999–$16,999
150–400kg/day	30kg roaster	SD-30KG Pro (full set)	$51,499
400kg+/day	60kg–300kg	SD-60KG to SD-360KG Pro	$61,999+

Still unsure? Use the capacity calculator on our homepage or send us a WhatsApp message — we'll give you a specific recommendation within 2 hours.