THE NUMBERS, EXPLAINED
How to use this calculator.
Entered rates govern this scenario. Restart cost is included once even if delay is zero; enter zero when no restart is incurred.
Start with your inputs
Enter idle crew members, crew standby rate per person-hour (currency), equipment standby rate per hour (currency), access delay (hours), unavoidable restart cost (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Idle crew members | 4 |
| Crew standby rate per person-hour (currency) | 30 |
| Equipment standby rate per hour (currency) | 80 |
| Access delay (hours) | 2 |
| Unavoidable restart cost (currency) | 50 |
A worked example
With the example inputs above, crew standby cost (currency) is 240. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Crew standby cost (currency) | 240 |
| Equipment standby cost (currency) | 160 |
| Total delay scenario cost (currency) | 450 |
How this is calculated
Crew standby cost (currency)
Multiply crew size, hourly standby rate and delay.
Equipment standby cost (currency)
Apply equipment hourly charge over the delay.
Total delay scenario cost (currency)
Add crew, equipment and entered restart costs.
Symbols and units
- a
- Idle crew members
- b
- Crew standby rate per person-hour (currency)
- c
- Equipment standby rate per hour (currency)
- d
- Access delay (hours)
- e
- Unavoidable restart cost (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
Entered rates govern this scenario. Restart cost is included once even if delay is zero; enter zero when no restart is incurred.
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?
Crew standby cost (currency); Equipment standby cost (currency); Total delay scenario cost (currency). 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: Entered rates govern this scenario. Restart cost is included once even if delay is zero; enter zero when no restart is incurred.
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 →