THE NUMBERS, EXPLAINED
How to use this calculator.
Constant daily production, user-prescribed retention and immediate disposal at expiry; includes no aisle or equipment space allowance.
Start with your inputs
Enter batches produced per day, samples retained per batch, retention window (days), packed volume per sample (l). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Batches produced per day | 4 |
| Samples retained per batch | 2 |
| Retention window (days) | 30 |
| Packed volume per sample (L) | 0.25 |
A worked example
With the example inputs above, steady-state retained sample count is 240. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Steady-state retained sample count | 240 |
| Storage volume (L) | 60 |
| Samples entering and leaving daily | 8 |
How this is calculated
Steady-state retained sample count
Multiply daily batches, samples per batch and retention days.
Storage volume (L)
Multiply retained samples by packed sample volume.
Samples entering and leaving daily
At steady state, daily inflow equals daily expiry.
Symbols and units
- a
- Batches produced per day
- b
- Samples retained per batch
- c
- Retention window (days)
- d
- Packed volume per sample (L)
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
Constant daily production, user-prescribed retention and immediate disposal at expiry; includes no aisle or equipment space allowance.
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?
Steady-state retained sample count; Storage volume (L); Samples entering and leaving daily. 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: Constant daily production, user-prescribed retention and immediate disposal at expiry; includes no aisle or equipment space allowance.
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 →