Estimate how many client-facing hours a fractional executive can responsibly sell in a year. The calculator separates total working time from internal administration, business development, time off, and a planning buffer. Use the result to size a client roster, check whether a revenue target fits available capacity, and avoid treating every working hour as billable.
Client capacity divides annual billable capacity by twelve times the expected monthly hours per client.
This is a planning ceiling, not a promise that every available hour will be sold. A roster near the limit leaves little room for scope changes, prospecting, or executive emergencies.
Use realistic averages from your calendar or time records. Travel, board preparation, and proposal work belong in nonbillable time unless clients are explicitly charged for them.
At 40 hours per week for 46 weeks, with 30% nonbillable time and a 10% buffer, capacity is 1,159.2 billable hours per year. At 24 hours per client each month, that supports 4 full clients with some hours remaining.
Usually no. Include them in the nonbillable percentage unless a client contract specifically pays for that work.
The buffer reserves time for overruns, urgent decisions, and scheduling friction that a perfect calendar does not capture.
Yes. Convert each retainer into the average client hours it consumes per month.
The practical client count is rounded down because a fraction of a full monthly commitment is not a complete client slot.
No. Reduce working weeks for vacation and leave nonbillable time for activities performed during working weeks.
| Variable | Meaning |
|---|---|
| Working weeks | Weeks in which client or internal work can occur. |
| Nonbillable rate | Share of working time unavailable for client billing. |
| Capacity buffer | Additional share deliberately left unsold. |
| Hours per client | Average monthly delivery commitment for one client. |