THE NUMBERS, EXPLAINED
How to use this calculator.
Ideal rectangular bin and non-gusseted liner, without stretch; practical fit must account for seams and material thickness.
Start with your inputs
Enter rectangular bin opening length (cm), bin opening width (cm), bin depth (cm), tie allowance above rim (cm), available liner lay-flat width (cm), available liner length (cm). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Rectangular bin opening length (cm) | 40 |
| Bin opening width (cm) | 30 |
| Bin depth (cm) | 60 |
| Tie allowance above rim (cm) | 15 |
| Available liner lay-flat width (cm) | 75 |
| Available liner length (cm) | 95 |
A worked example
With the example inputs above, minimum liner lay-flat width (cm) is 70. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Minimum liner lay-flat width (cm) | 70 |
| Minimum liner length (cm) | 90 |
| Fit of supplied liner | Fits geometric allowance |
How this is calculated
Minimum liner lay-flat width (cm)
Use half the rectangular bin opening perimeter.
Minimum liner length (cm)
Allow bin depth, half the shorter base side and top tie length.
Fit of supplied liner
Compare both supplied liner dimensions with geometric requirements.
Symbols and units
- a
- Rectangular bin opening length (cm)
- b
- Bin opening width (cm)
- c
- Bin depth (cm)
- d
- Tie allowance above rim (cm)
- e
- Available liner lay-flat width (cm)
- f
- Available liner length (cm)
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
Ideal rectangular bin and non-gusseted liner, without stretch; practical fit must account for seams and material thickness.
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?
Minimum liner lay-flat width (cm); Minimum liner length (cm); Fit of supplied liner. 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: Ideal rectangular bin and non-gusseted liner, without stretch; practical fit must account for seams and material thickness.
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.
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