Runs on this device. Inputs are not uploaded or saved. Results rounded for display.
How to use it
- Measure the inputs in the units shown. Keep a note of your original recipe.
- Change the relevant input and calculate. Compare the answer with the worked example below.
- Use the output within the stated limits; reset to restore the example inputs.
Worked example
500 g green to 425 g roasted is a 75 g loss, 15% loss and 85% yield.
Assumptions and limits
Record consistent tare and cooling conditions. Mass loss alone does not identify roast development, moisture content, safety or a roast colour classification.
Questions
What does this result establish?
Loss percentage = (green mass − cooled roasted mass) / green mass × 100. Yield percentage is roasted / green × 100. It provides the stated arithmetic or random ordering; it is not a taste or equipment certification.
What measurements should I use?
Green bean batch mass (g); Cooled roasted mass (g). Keep the units consistent rather than copying a number from a differently labelled recipe.
Why is an input rejected?
Blank, non-finite, negative or out-of-domain measurements cannot produce a valid answer. Each field has a bounded range. Incompatible combinations show an explanation instead of retaining a previous result.
Can I use this without an account?
Yes. Once this page and its modules load, the calculation runs locally without accounts, external APIs or input storage. Reloading restores the defaults.
Related tools
Coffee Cost Per Cup
Coffee cost = bag price × dose / bag mass; milk cost = litre price × ml / 1000. Add other cost.
Open tool →Bean Use and Shopping Planner
Daily coffee = cups × dose. Period use = daily coffee × days. Required purchase is period use minus stock, floored at zero.
Open tool →Blind Tasting Order Generator
Shuffle numbered samples with Web Crypto and an unbiased Fisher–Yates shuffle; assign positions A, B, C and onward.
Open tool →