THE NUMBERS, EXPLAINED
How to use this calculator.
Coffee-only cost audit; equal allocation per drink is shown alongside actual single/double dose use.
Start with your inputs
Enter served single-shot drinks, served double-shot drinks, dose per shot (g), coffee discarded in purges (g), bean price (currency/kg). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Served single-shot drinks | 80 |
| Served double-shot drinks | 20 |
| Dose per shot (g) | 10 |
| Coffee discarded in purges (g) | 200 |
| Bean price (currency/kg) | 25 |
A worked example
With the example inputs above, total coffee used (g) is 1,400. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Total coffee used (g) | 1,400 |
| Coffee cost per served drink (currency) | 0.35 |
| Purge share of coffee (%) | 14.285714 |
How this is calculated
Total coffee used (g)
Add shot doses and separately measured purge.
Coffee cost per served drink (currency)
Allocate total coffee cost equally across served drinks.
Purge share of coffee (%)
Divide purge mass by total coffee use.
Symbols and units
- a
- Served single-shot drinks
- b
- Served double-shot drinks
- c
- Dose per shot (g)
- d
- Coffee discarded in purges (g)
- e
- Bean price (currency/kg)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Coffee-only cost audit; equal allocation per drink is shown alongside actual single/double dose use.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Total coffee used (g); Coffee cost per served drink (currency); Purge share of coffee (%). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Coffee-only cost audit; equal allocation per drink is shown alongside actual single/double dose use.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Describe and Identify Cost Drivers ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →