THE NUMBERS, EXPLAINED
How to use this calculator.
Counts represent the thickest closed cross-section, not the unfolded wallet. Compression is an observed uniform fraction; hardware and contents are excluded.
Start with your inputs
Enter leather layer calipers (mm), layer repetitions at thickest fold, additional lining and adhesive total (mm), measured compression (%). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Leather layer calipers (mm) | 1,2,0.5 |
| Layer repetitions at thickest fold | 2,1,2 |
| Additional lining and adhesive total (mm) | 0.5 |
| Measured compression (%) | 10 |
A worked example
With the example inputs above, uncompressed closed thickness (mm) is 5.5. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Uncompressed closed thickness (mm) | 5.5 |
| Estimated compressed thickness (mm) | 4.95 |
How this is calculated
Uncompressed closed thickness (mm)
Multiply layer calipers by repeats and add lining/adhesive.
Estimated compressed thickness (mm)
Apply supplied compression fraction.
Symbols and units
- a
- Leather layer calipers (mm)
- b
- Layer repetitions at thickest fold
- c
- Additional lining and adhesive total (mm)
- d
- Measured compression (%)
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
Counts represent the thickest closed cross-section, not the unfolded wallet. Compression is an observed uniform fraction; hardware and contents are excluded.
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?
Uncompressed closed thickness (mm); Estimated compressed thickness (mm). 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: Counts represent the thickest closed cross-section, not the unfolded wallet. Compression is an observed uniform fraction; hardware and contents are excluded.
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 Prealgebra 2e — arithmetic 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.
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