THE NUMBERS, EXPLAINED
How to use this calculator.
Uniform rejection assumption; lanes advance together. Roll length is usable length after setup waste.
Start with your inputs
Enter planned saleable packs, assumed reject rate (%), pack pitch along film (mm), packs across each film advance, usable roll length (m). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Planned saleable packs | 900 |
| Assumed reject rate (%) | 10 |
| Pack pitch along film (mm) | 200 |
| Packs across each film advance | 2 |
| Usable roll length (m) | 100 |
A worked example
With the example inputs above, gross packs required is 1,000. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Gross packs required | 1,000 |
| Film advances | 500 |
| Film required (m) | 100 |
| Rolls to purchase | 1 |
How this is calculated
Gross packs required
Inflate saleable target for the assumed yield.
Film advances
Round gross packs to full lane groups.
Film required (m)
Multiply advances by pitch and convert millimetres.
Rolls to purchase
Round film requirement to whole rolls.
Symbols and units
- a
- Planned saleable packs
- b
- Assumed reject rate (%)
- c
- Pack pitch along film (mm)
- d
- Packs across each film advance
- e
- Usable roll length (m)
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
Uniform rejection assumption; lanes advance together. Roll length is usable length after setup waste.
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?
Gross packs required; Film advances; Film required (m); Rolls 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: Uniform rejection assumption; lanes advance together. Roll length is usable length after setup waste.
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 →