Coffee, Tea, Roasting & Dry Goods Processing calculator
Roast Batch Yield Calculator
Roast batch yield is the percentage of green coffee weight that survives roasting and leaves the drum as finished coffee. Roasters and production planners use it to predict how much sellable product a green lot will produce, to true up costing, and to flag drums that are roasting hotter or longer than spec. Because green coffee is the single largest cost in most roasteries, a one- or two-point swing in yield directly changes your cost per finished pound. Tracking it batch to batch is the fastest way to catch a profile that has drifted too dark or a green lot that came in unusually wet.
What this calculator does
- Calculate roast batch yield from roasted coffee output, green coffee charged, and target roast yield.
- reviewing roast loss, green-to-roasted yield, and batch cost impact
- It computes finished roasted weight as a percentage of the green weight charged, and the gap between that yield and your target.
Formula used
- Roast Batch Yield = roasted coffee output ÷ green coffee charged × 100
- Gap to target = target roast yield - roast batch yield
Inputs explained
- Roasted coffee output (out of roaster):
- Green coffee charged to drum:
- Target roast yield:
How to use the result
- Use it after each batch (or each green lot) to verify the profile is hitting spec and to convert green inventory into sellable-pound forecasts.
- Yield alone does not tell you cup quality or roast level — a perfect yield number can still sit on an underdeveloped or scorched roast, so pair it with development time and a taste check.
Common questions
- How do you calculate roast batch yield? Divide roasted coffee output by the green coffee charged and multiply by 100. With 84 lb out of 100 lb green charged, yield is 84 ÷ 100 × 100 = 84%.
- What is a good roast batch yield for coffee? Most commercial roasts land between 82% and 88%. Light roasts often hold 86-88%, while dark roasts can drop to 80-82% as more moisture and chaff burn off. The 84% in the example is a typical medium-roast figure.
- Why is my roast yield lower than target? The most common causes are roasting darker or longer than the profile calls for, drier-than-expected green, and chaff or fines lost in handling. A negative gap to target points you to check drop temperature and development time first.
- Does roast yield affect cost per pound? Directly. At 84% yield, every 100 lb of green produces 84 lb of finished coffee, so your green cost is spread across fewer sellable pounds. Dropping to 82% raises green cost per finished pound by roughly 2.5%.
- What is roast loss versus roast yield? They are complements: roast loss is the weight burned off (16% in the example) and roast yield is what remains (84%). Yield plus loss always equals 100%.
Last reviewed 2026-05-12.