THE NUMBERS, EXPLAINED
How to use this calculator.
Assumes each bottle is used separately with no pooling of residual product; costs exclude staff and applicators.
Start with your inputs
Enter tester bottles issued, usable product per bottle (ml), measured dose per trial (ml), bottle purchase price (currency), measured handling loss per bottle (ml). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Tester bottles issued | 4 |
| Usable product per bottle (mL) | 100 |
| Measured dose per trial (mL) | 2 |
| Bottle purchase price (currency) | 20 |
| Measured handling loss per bottle (mL) | 10 |
A worked example
With the example inputs above, complete trials per bottle is 45. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Complete trials per bottle | 45 |
| Total complete trials | 180 |
| Product cost per complete trial (currency) | 0.444444 |
How this is calculated
Complete trials per bottle
Deduct loss and divide by trial dose, rounding down.
Total complete trials
Multiply complete trials by issued testers.
Product cost per complete trial (currency)
Allocate full bottle cost to complete trials.
Symbols and units
- a
- Tester bottles issued
- b
- Usable product per bottle (mL)
- c
- Measured dose per trial (mL)
- d
- Bottle purchase price (currency)
- e
- Measured handling loss per bottle (mL)
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
Assumes each bottle is used separately with no pooling of residual product; costs exclude staff and applicators.
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?
Complete trials per bottle; Total complete trials; Product cost per complete trial (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: Assumes each bottle is used separately with no pooling of residual product; costs exclude staff and applicators.
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.
Read the quality report →