THE NUMBERS, EXPLAINED
How to use this calculator.
One compatible strip profile; each door receives two vertical lengths and one top. Packs can be joined; use separate runs for incompatible profiles.
Start with your inputs
Enter door heights (m), door widths (m), supplied pack length (m), waste allowance (%). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Door heights (m) | 2,2 |
| Door widths (m) | 1,0.8 |
| Supplied pack length (m) | 5 |
| Waste allowance (%) | 10 |
A worked example
With the example inputs above, door cut lengths (m) is 5, 4.8. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Door cut lengths (m) | 5, 4.8 |
| Allowance-adjusted total (m) | 10.78 |
| Packs to buy | 3 |
How this is calculated
Door cut lengths (m)
Add twice each door height and its width.
Allowance-adjusted total (m)
Add door perimeter cuts and the waste allowance.
Packs to buy
Divide allowance-adjusted length by supplied pack length and round up.
Symbols and units
- a
- Door heights (m)
- b
- Door widths (m)
- c
- Supplied pack length (m)
- d
- Waste 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
One compatible strip profile; each door receives two vertical lengths and one top. Packs can be joined; use separate runs for incompatible profiles.
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?
Door cut lengths (m); Allowance-adjusted total (m); Packs to buy. 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: One compatible strip profile; each door receives two vertical lengths and one top. Packs can be joined; use separate runs for incompatible profiles.
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: Solve proportions and their applications ↗
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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