THE NUMBERS, EXPLAINED
How to use this calculator.
All quantities refer to the same contract period; area pricing alone does not establish adequate service frequency.
Start with your inputs
Enter contract cleanable area (m²), quoted price per m² (currency), expected paid labour hours, loaded hourly wage (currency), supplies for contract period (currency), allocated period overhead (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Contract cleanable area (m²) | 1000 |
| Quoted price per m² (currency) | 2 |
| Expected paid labour hours | 50 |
| Loaded hourly wage (currency) | 20 |
| Supplies for contract period (currency) | 200 |
| Allocated period overhead (currency) | 300 |
A worked example
With the example inputs above, contract revenue (currency) is 2,000. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Contract revenue (currency) | 2,000 |
| Contribution after entered costs (currency) | 500 |
| Implied revenue per paid hour | 40 |
| Break-even area price (currency/m²) | 1.5 |
How this is calculated
Contract revenue (currency)
Multiply quoted area price by contracted area.
Contribution after entered costs (currency)
Deduct paid labour, supplies and overhead.
Implied revenue per paid hour
Divide contract revenue by paid labour hours.
Break-even area price (currency/m²)
Spread entered costs over contracted area.
Symbols and units
- a
- Contract cleanable area (m²)
- b
- Quoted price per m² (currency)
- c
- Expected paid labour hours
- d
- Loaded hourly wage (currency)
- e
- Supplies for contract period (currency)
- f
- Allocated period overhead (currency)
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
All quantities refer to the same contract period; area pricing alone does not establish adequate service frequency.
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?
Contract revenue (currency); Contribution after entered costs (currency); Implied revenue per paid hour; Break-even area price (currency/m²). 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: All quantities refer to the same contract period; area pricing alone does not establish adequate service frequency.
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 →