THE NUMBERS, EXPLAINED
How to use this calculator.
Travel, breaks and productive tasks are mutually exclusive categories. Unallocated time is a recording gap, not proof of inactivity.
Start with your inputs
Enter clocked hours, recorded travel hours, recorded paid breaks (hours), recorded productive task hours. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Clocked hours | 40 |
| Recorded travel hours | 5 |
| Recorded paid breaks (hours) | 3 |
| Recorded productive task hours | 30 |
A worked example
With the example inputs above, productive fraction of paid hours (%) is 75. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Productive fraction of paid hours (%) | 75 |
| Unallocated paid hours | 2 |
| Travel plus break share (%) | 20 |
How this is calculated
Productive fraction of paid hours (%)
Divide measured productive task time by clocked time.
Unallocated paid hours
Subtract travel, paid breaks and productive tasks.
Travel plus break share (%)
Compare recorded non-task time with clocked hours.
Symbols and units
- a
- Clocked hours
- b
- Recorded travel hours
- c
- Recorded paid breaks (hours)
- d
- Recorded productive task hours
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
Travel, breaks and productive tasks are mutually exclusive categories. Unallocated time is a recording gap, not proof of inactivity.
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?
Productive fraction of paid hours (%); Unallocated paid hours; Travel plus break share (%). 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: Travel, breaks and productive tasks are mutually exclusive categories. Unallocated time is a recording gap, not proof of inactivity.
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 →