The Agency Inventory Calculator estimates available service capacity in billable hours. For an agency, “inventory” is usually not a physical product; it is the portion of team time that can still be sold and delivered within a planning period.
Enter headcount, working hours per person, target utilization, and already committed billable hours. The calculator returns total billable capacity, remaining capacity, and the percentage already booked. It can support staffing, sales pacing, and workload balancing, but it does not replace a detailed schedule that accounts for skills, deadlines, leave, and project dependencies.
1. Define the planning period
Use working hours and commitments for the same week, month, or quarter.
2. Enter delivery headcount
Count people whose time is included in the capacity pool.
3. Set working hours
Use available work hours per person before applying utilization.
4. Apply target utilization
Reserve nonbillable time by entering the percentage expected to be billable.
5. Subtract committed work
Enter hours already sold or scheduled, then review remaining or overbooked capacity.
Billable capacity = Team members × Working hours per person × Utilization rate
Remaining capacity = max(0, Billable capacity − Committed hours)
Overbooked hours = max(0, Committed hours − Billable capacity)
Utilization is entered as a percentage and converted to a decimal. The model treats every team member as interchangeable, so skill-specific constraints require a more detailed resource plan.
Remaining capacity is the estimated number of additional billable hours that can be accepted in the period.
A high booked percentage may still hide scheduling conflicts or mismatched skills.
Given: 10 team members, 160 working hours each, 70% target utilization, and 800 committed hours.
Calculation: Billable capacity = 10 × 160 × 0.70 = 1,120 hours. Remaining capacity = 1,120 − 800 = 320 hours. Booked percentage = 800 ÷ 1,120 × 100 = 71.43%.
Result: The agency has an estimated 320 billable hours available.
Agency teams need time for meetings, training, administration, sales support, and leave. The utilization input reserves that nonbillable time.
Include them when their hours are available and controlled within the same planning period.
The remaining result becomes zero and the overbooked-hours figure shows the excess.
This calculator models time capacity. Convert hours to revenue separately using expected billing rates or project prices.
Not necessarily. Timing, skills, dependencies, and client approvals can still limit practical availability.