THE NUMBERS, EXPLAINED
How to use this calculator.
Only signed hours are priced; materials and equipment are entered approved totals. Signature counts do not prove contractual entitlement.
Start with your inputs
Enter signed labour hours by worker, agreed hourly rates by worker (currency), materials total (currency), equipment total (currency), submitted daywork sheets, signed daywork sheets. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Signed labour hours by worker | 8,6 |
| Agreed hourly rates by worker (currency) | 30,40 |
| Materials total (currency) | 100 |
| Equipment total (currency) | 80 |
| Submitted daywork sheets | 3 |
| Signed daywork sheets | 2 |
A worked example
With the example inputs above, labour amount (currency) is 480. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Labour amount (currency) | 480 |
| Daywork total (currency) | 660 |
| Unsigned sheets | 1 |
How this is calculated
Labour amount (currency)
Price signed worker hours at agreed rates.
Daywork total (currency)
Add labour, materials and equipment.
Unsigned sheets
Subtract signed sheets from submitted sheets.
Symbols and units
- a
- Signed labour hours by worker
- b
- Agreed hourly rates by worker (currency)
- c
- Materials total (currency)
- d
- Equipment total (currency)
- e
- Submitted daywork sheets
- f
- Signed daywork sheets
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
Only signed hours are priced; materials and equipment are entered approved totals. Signature counts do not prove contractual entitlement.
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?
Labour amount (currency); Daywork total (currency); Unsigned sheets. 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: Only signed hours are priced; materials and equipment are entered approved totals. Signature counts do not prove contractual entitlement.
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 →