THE NUMBERS, EXPLAINED
How to use this calculator.
Steady occupancy; average stay estimates arrivals over the forecast period. Nightly packs are additional to arrival packs.
Start with your inputs
Enter occupied rooms per night, forecast nights, average stay length (nights), arrival amenity packs per room, additional packs per occupied room-night, usable amenity stock. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Occupied rooms per night | 40 |
| Forecast nights | 7 |
| Average stay length (nights) | 2 |
| Arrival amenity packs per room | 1 |
| Additional packs per occupied room-night | 0.5 |
| Usable amenity stock | 100 |
A worked example
With the example inputs above, expected arrival packs is 140. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Expected arrival packs | 140 |
| Total forecast packs | 280 |
| Whole packs to purchase | 180 |
How this is calculated
Expected arrival packs
Estimate stays from occupied room-nights divided by average stay.
Total forecast packs
Add arrival packs and nightly replenishment.
Whole packs to purchase
Deduct available stock and round up.
Symbols and units
- a
- Occupied rooms per night
- b
- Forecast nights
- c
- Average stay length (nights)
- d
- Arrival amenity packs per room
- e
- Additional packs per occupied room-night
- f
- Usable amenity stock
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
Steady occupancy; average stay estimates arrivals over the forecast period. Nightly packs are additional to arrival packs.
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?
Expected arrival packs; Total forecast packs; Whole packs to purchase. 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: Steady occupancy; average stay estimates arrivals over the forecast period. Nightly packs are additional to arrival packs.
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 →