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Virtual Assistant Billable Capacity Estimator

The Virtual Assistant Billable Capacity Estimator estimates the client-service hours a virtual assistant can realistically sell across a year. It separates total working time from the hours consumed by scheduling, inbox management, invoicing, onboarding, marketing, and other nonbillable tasks that still support the business.

The output helps independent VAs decide how many retainer hours or hourly clients they can support without assuming every working hour is billable. It can also provide a practical capacity input for pricing, workload reviews, and decisions about adding clients or subcontracting work.

Schedule assumptions

hours
weeks
%
%
Result
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Billable capacity
Gross working hours—
Hours after nonbillable time—
Average monthly capacity—
Average weekly billable capacity—

1. Set weekly working time
Enter the average number of hours you expect to work in a normal week as a virtual assistant.

2. Choose active working weeks
Enter the weeks you expect to work during the year after vacations, holidays, or planned breaks.

3. Allow for nonbillable work
Enter the percentage of working time used for administration, sales, coordination, learning, and other work that cannot be billed directly to clients.

4. Keep a capacity reserve
Add a reserve percentage for schedule gaps, urgent tasks, and normal variation instead of planning to sell every remaining hour.

5. Review annual and monthly capacity
Use the main result as estimated annual billable hours and compare the monthly and weekly figures with your client commitments.

Gross working hours = Weekly working hours × Working weeks Usable hours = Gross working hours × (1 − Nonbillable % / 100) Billable capacity = Usable hours × (1 − Capacity reserve % / 100)

Nonbillable time and the reserve are applied sequentially, so the reserve is taken from hours left after nonbillable work. The estimate assumes the percentages are representative averages over the year.

What the result means

Estimated billable capacity is the number of client-facing hours that remain after the time allowances entered. It is a planning limit, not a forecast of client demand.

If your workload is seasonal, run separate scenarios for busy and quiet periods rather than relying on one annual average.

Given: 32 working hours per week, 48 working weeks, 22% nonbillable time, and an 8% capacity reserve.

Calculation:
Gross working hours = 32 × 48 = 1,536 hours.
Usable hours = 1,536 × 0.78 = 1,198.08 hours.
Billable capacity = 1,198.08 × 0.92 = 1,102.2336 hours.

Result: about 1,102 billable hours per year, or about 92 hours per month.

Interpretation: This VA can plan around roughly 92 client-service hours per month while preserving the stated time for business administration and schedule flexibility.

Do client meetings count as billable capacity?

Count them as billable only when your agreement allows you to charge the client for that meeting time. Otherwise include them in nonbillable time.

How should retainer hours fit into this estimate?

Add the monthly hours promised across all retainers and compare that total with the estimated monthly capacity. Leave additional room if retainers often expand beyond their minimum hours.

What nonbillable percentage should a VA enter?

Use your own recent records when possible. Administrative, marketing, onboarding, bookkeeping, and unpaid communication can vary widely between VA businesses.

Can capacity reserve be zero?

Yes, but a zero reserve assumes you are comfortable scheduling all hours left after nonbillable work. A positive reserve can make planning more resilient to interruptions and uneven demand.

Why can annual capacity be lower even when I work many weeks?

A high nonbillable share or reserve can reduce sellable hours substantially. The calculator shows the combined effect rather than treating all scheduled work time as client time.