Calculator
Billable Hours Calculator
Estimate realistic billable hours after admin, sales, meetings, sick time, holidays, vacation, and the general capacity drag of running a solo business.
Hours worked and hours billable are not the same thing. Admin, sales, email, proposals, revisions, context switching, and client management are real work even when nobody pays for them directly. This calculator makes that gap visible before the rest of your pricing stack starts lying.
What this includes
- Gross annual capacity from your actual weekly schedule
- Time-off subtraction for vacation, holidays, sick days, and slack
- Weekly non-billable drag from admin, pipeline work, meetings, and ops
- Optional revenue and hourly-rate pressure tests
- Warnings for fantasy utilization, missing overhead, and future burnout
Use this when...
- You are setting a baseline before hourly-rate, quote, or revenue-goal math.
- You suspect your calendar can support less billable work than your spreadsheet keeps claiming.
- You want to pressure-test whether a revenue target fits a solo-operator workload.
Do not use this for...
- Pricing a scoped project by itself. Use the Project Quote Calculator after this.
- Auditing a finished job after delivery. That is Effective Hourly Rate territory.
- Pretending unlimited focus, zero admin, and no vacation are serious business assumptions.
Keep these assumptions visible
Most solo operators do not bill anything close to every hour they work.
If your spreadsheet assumes permanent 30-hour billable weeks plus zero admin and no recovery time, the issue is not ambition. The issue is that your denominator is doing performance art.
- 20 to 25 billable hours per week is credible for many solo operators.
- Admin, sales, email, and meetings still count even when clients do not see line items for them.
- Time off is part of capacity planning, not a rounding error.
- Utilization above the mid-60% range deserves suspicion before celebration.
Result
Realistic billable hours: 792 / year
That works out to about 17 billable hours per week and 41% billable utilization.
Gross working hours
1,920
The calendar before non-billable work and time off take their cut.
Estimated non-billable
1,128
Admin, sales, meetings, internal ops, sick time, holidays, vacation, and slack.
Billable hours / month
66
A calmer denominator for revenue planning and proposal math.
Time-off days
33
264 hours removed from annual capacity.
Weekly non-billable drag
18
Nobody pays directly for this chunk, but the calendar still does.
Revenue capacity at target rate
$138,600
Based on $175/hr.
Required hourly rate
$158/hr
Needed to hit $125,000 with this billable capacity.
Target-rate pressure test
At $175/hr, you would need 714 billable hours to hit the annual revenue target.
Verdict: Well Protected
The plan leaves room for admin, sales, and recovery while still supporting useful billable capacity. That is how a business behaves when it respects physics.
Warnings
info
Current capacity supports the revenue target
At $175/hr, this capacity supports about $138,600 in annual revenue.
Next action
Use this capacity in your revenue and quote math
Carry the realistic billable-hours number into your revenue target, hourly floor, and project quote decisions so the rest of the system stays honest.
Visible assumptions
- Gross capacity base
- Working weeks x days per week x hours per day
- Non-billable work includes
- Admin, sales, meetings/context switching, and internal ops
- Time-off subtraction
- Vacation + holidays + sick days + buffer days
- Billable utilization formula
- Billable hours per year รท gross working hours per year
- Currency handling
- Formatting only in USD. No exchange-rate conversion.
Educational estimate only. Not tax, legal, accounting, or staffing advice.
What this calculator is actually doing
It starts with gross working capacity, then subtracts the work nobody invoices directly and the days you are not available to work at all. What remains is a billable-hours number you can actually use in revenue planning, hourly-rate math, and fixed-fee quotes without acting surprised later.
Why this number matters
If you tell yourself you can bill 1,400 hours a year when your real calendar only supports 800 to 1,000, every downstream decision gets softer than it looks. Your hourly floor comes out too low. Your project quotes look generous. Your revenue target appears reasonable right up until your week starts eating evenings.
This is not about pessimism. It is about distinguishing between work that keeps the business running and work a client actually pays for. Both are real. Only one makes the invoice.
Formula and assumptions
Gross working hours = working weeks x days per week x hours
per day.
Estimated non-billable hours = weekly admin + sales + meetings/context
switching + internal ops, multiplied across the year, plus vacation, holiday,
sick, and buffer days converted into hours.
Realistic billable hours = gross working hours - estimated
non-billable hours.
Related calculators
Freelance Hourly Rate Calculator
Use this right after capacity planning so your hourly floor is built on believable billable hours.
Project Quote Calculator
Turn realistic billable capacity into fixed-fee quote math that prices the ugly parts too.
Effective Hourly Rate Calculator
Audit whether finished work actually respected the billable-hours story you told yourself upfront.
Revenue Goal Calculator
Check whether your annual target still makes sense once the denominator stops pretending every hour is sellable.