THE NUMBERS, EXPLAINED
How to use this calculator.
User-selected proportional sample with site-level rounding, not a statistical assurance or audit acceptance plan.
Start with your inputs
Enter inspectable zones by site, chosen sample fraction (%), inspection duration per zone (minutes), available inspection minutes. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Inspectable zones by site | 40,60 |
| Chosen sample fraction (%) | 10 |
| Inspection duration per zone (minutes) | 5 |
| Available inspection minutes | 60 |
A worked example
With the example inputs above, required sample zones by site is 4, 6. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Required sample zones by site | 4, 6 |
| Total inspection minutes | 50 |
| Capacity shortfall (minutes) | 0 |
| Overall sample coverage (%) | 10 |
How this is calculated
Required sample zones by site
Apply the chosen fraction and round each site upward.
Total inspection minutes
Multiply sampled zones by inspection duration.
Capacity shortfall (minutes)
Compare sample workload with available inspection time.
Overall sample coverage (%)
Compare whole sampled zones with the total population.
Symbols and units
- a
- Inspectable zones by site
- b
- Chosen sample fraction (%)
- c
- Inspection duration per zone (minutes)
- d
- Available inspection minutes
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
User-selected proportional sample with site-level rounding, not a statistical assurance or audit acceptance plan.
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?
Required sample zones by site; Total inspection minutes; Capacity shortfall (minutes); Overall sample coverage (%). 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: User-selected proportional sample with site-level rounding, not a statistical assurance or audit acceptance plan.
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 →