THE NUMBERS, EXPLAINED
How to use this calculator.
Uses measured coverage and a constant full-cycle duration. Rooms share charge capacity; last cycle is budgeted at full duration. Starts charged.
Start with your inputs
Enter room areas (m²), tested area per charge (m²), cleaning time per cycle (min), recharge time (min). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Room areas (m²) | 30,50 |
| Tested area per charge (m²) | 40 |
| Cleaning time per cycle (min) | 45 |
| Recharge time (min) | 120 |
A worked example
With the example inputs above, charge cycles is 2. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Charge cycles | 2 |
| Completion window (min) | 210 |
How this is calculated
Charge cycles
Divide total area by tested coverage and round up.
Completion window (min)
Add cleaning cycles and recharges between cycles.
Symbols and units
- a
- Room areas (m²)
- b
- Tested area per charge (m²)
- c
- Cleaning time per cycle (min)
- d
- Recharge time (min)
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
Uses measured coverage and a constant full-cycle duration. Rooms share charge capacity; last cycle is budgeted at full duration. Starts charged.
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?
Charge cycles; Completion window (min). 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: Uses measured coverage and a constant full-cycle duration. Rooms share charge capacity; last cycle is budgeted at full duration. Starts charged.
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: Solve proportions and their applications ↗
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 →