THE NUMBERS, EXPLAINED
How to use this calculator.
Uses only your serving assumptions. It does not recommend alcohol consumption, account for age or driving, or replace water and non-alcoholic planning.
Start with your inputs
Enter guests, servings per guest by drink type, servings per package by drink type, spare allowance (%). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Guests | 40 |
| Servings per guest by drink type | 2,1,0.5 |
| Servings per package by drink type | 6,8,4 |
| Spare allowance (%) | 10 |
A worked example
With the example inputs above, planned servings by drink is 88, 44, 22. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Planned servings by drink | 88, 44, 22 |
| Packages by drink | 15, 6, 6 |
| Total planned servings | 154 |
How this is calculated
Planned servings by drink
For each drink: round up guests × servings per guest × (1 + spare percentage/100).
Packages by drink
For each drink: round up planned servings ÷ servings per package.
Total planned servings
Add planned servings across drink types.
Symbols and units
- a
- Guests
- b
- Servings per guest by drink type
- c
- Servings per package by drink type
- d
- Spare allowance (%)
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
Uses only your serving assumptions. It does not recommend alcohol consumption, account for age or driving, or replace water and non-alcoholic planning.
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?
Planned servings by drink; Packages by drink; Total planned servings. 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: Uses only your serving assumptions. It does not recommend alcohol consumption, account for age or driving, or replace water and non-alcoholic planning.
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: percentages and proportions ↗
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 →