THE NUMBERS, EXPLAINED
How to use this calculator.
Compares cost per future wear only; existing purchase is sunk, and both options exclude maintenance and resale.
Start with your inputs
Enter repair quote (currency), expected extra repaired wears, replacement purchase (currency), expected replacement wears. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Repair quote (currency) | 30 |
| Expected extra repaired wears | 20 |
| Replacement purchase (currency) | 100 |
| Expected replacement wears | 50 |
A worked example
With the example inputs above, repair cost per extra wear is 1.5. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Repair cost per extra wear | 1.5 |
| Replacement cost per wear | 2 |
| Maximum repair price at equal cost per wear | 40 |
How this is calculated
Repair cost per extra wear
Divide repair quote by additional expected wears.
Replacement cost per wear
Divide replacement price by expected wears.
Maximum repair price at equal cost per wear
Multiply replacement cost per wear by repaired garment extra wears.
Symbols and units
- a
- Repair quote (currency)
- b
- Expected extra repaired wears
- c
- Replacement purchase (currency)
- d
- Expected replacement wears
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
Compares cost per future wear only; existing purchase is sunk, and both options exclude maintenance and resale.
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?
Repair cost per extra wear; Replacement cost per wear; Maximum repair price at equal cost per wear. 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: Compares cost per future wear only; existing purchase is sunk, and both options exclude maintenance and resale.
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.
Read the quality report →