In this example, increasing extra revision rounds from 3 to 3.3 changes the result from 540 to 594 . All other inputs stay the same.
Try this with your own numbersFormula and worked example
Revision cost = rounds × people × hours × hourly cost
| Input | Example |
|---|---|
| Extra revision rounds | 3 |
| People involved per round | 2 |
| Hours per person per round | 2 |
| Loaded hourly cost | 45 |
| Calculated result | 540 |
Choose reliable inputs
Plan materials, travel and crew time before committing to a price. For this welding shop calculation, use a completed job sheet, supplier quotes and a crew schedule and a consistent definition of one fabrication job.
- Metal: include the portion belonging to this fabrication job or reporting period, and record where the value came from.
- Consumables: include the portion belonging to this fabrication job or reporting period, and record where the value came from.
- Machine time: include the portion belonging to this fabrication job or reporting period, and record where the value came from.
Use the same currency for every money input. Do not mix weekly costs with monthly revenue, or count the same expense in both an itemised cost and allocated overhead.
How much does one more revision round cost?
Include coordination in recorded hours and do not assume extra rounds are contractually billable.
What if this input changes?
If extra revision rounds rises by 10%, this example changes by 54 . This shows the effect of one change; it does not predict what will happen.
Open the calculator, save your baseline, then change the input supported by the least reliable estimate in your records. Compare both scenarios before committing to a price or capacity promise.