THE NUMBERS, EXPLAINED
How to use this calculator.
Values are supplied estimates, not appraisals or investment guidance. Every category uses one per-item cost and value.
Start with your inputs
Enter item counts by collection category, recorded unit acquisition cost (currency), user-declared unit current value (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Item counts by collection category | 2,3 |
| Recorded unit acquisition cost (currency) | 10,20 |
| User-declared unit current value (currency) | 15,30 |
A worked example
With the example inputs above, total acquisition cost (currency) is 80. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Total acquisition cost (currency) | 80 |
| Total declared collection value (currency) | 120 |
| Declared value shares by category (%) | 25, 75 |
How this is calculated
Total acquisition cost (currency)
Multiply counts by acquisition cost and sum.
Total declared collection value (currency)
Multiply counts by declared unit value and sum.
Declared value shares by category (%)
Divide each category declared value by collection total.
Symbols and units
- a
- Item counts by collection category
- b
- Recorded unit acquisition cost (currency)
- c
- User-declared unit current value (currency)
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
Values are supplied estimates, not appraisals or investment guidance. Every category uses one per-item cost and value.
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?
Total acquisition cost (currency); Total declared collection value (currency); Declared value shares by category (%). 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: Values are supplied estimates, not appraisals or investment guidance. Every category uses one per-item cost and value.
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.
Read the quality report →