THE NUMBERS, EXPLAINED
How to use this calculator.
Separates gross contribution from cash tied in unsold stock; excludes rent, labour and tax.
Start with your inputs
Enter consumable units purchased, purchase cost per unit (currency), units resold, resale price per unit (currency), units wasted. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Consumable units purchased | 100 |
| Purchase cost per unit (currency) | 2 |
| Units resold | 80 |
| Resale price per unit (currency) | 4 |
| Units wasted | 10 |
A worked example
With the example inputs above, unsold stock remaining is 10. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Unsold stock remaining | 10 |
| Contribution after sold and wasted goods (currency) | 140 |
| Closing stock at purchase cost (currency) | 20 |
| Cash surplus from this purchase batch (currency) | 120 |
How this is calculated
Unsold stock remaining
Deduct sold and wasted units from purchases.
Contribution after sold and wasted goods (currency)
Charge sold and wasted unit costs against sales.
Closing stock at purchase cost (currency)
Value remaining stock at its purchase cost.
Cash surplus from this purchase batch (currency)
Compare receipts with total batch purchase cash.
Symbols and units
- a
- Consumable units purchased
- b
- Purchase cost per unit (currency)
- c
- Units resold
- d
- Resale price per unit (currency)
- e
- Units wasted
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
Separates gross contribution from cash tied in unsold stock; excludes rent, labour and tax.
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?
Unsold stock remaining; Contribution after sold and wasted goods (currency); Closing stock at purchase cost (currency); Cash surplus from this purchase batch (currency). 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: Separates gross contribution from cash tied in unsold stock; excludes rent, labour and tax.
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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