What are billable hours?
The billable hours calculator above turns the hours you can actually charge for into weekly, monthly, and annual revenue. Billable hours are the hours directly tied to client deliverables — the work you can legitimately put on an invoice. They are distinct from the total hours you work, which also include sales calls, admin, invoicing, learning, and unpaid revisions.
For anyone who sells their time — freelancers, consultants, agencies, lawyers, accountants — billable hours are the engine of revenue. Understanding how a given number of billable hours translates into income, and how sensitive that income is to your rate, is the foundation of pricing yourself sustainably. This calculator makes the relationship concrete: change the hours or the rate and watch the annual number move.
The formula
Weekly revenue = Billable hours per week × Hourly rate
Annual revenue = Weekly revenue × Working weeks per year
Monthly revenue = Annual revenue / 12- Billable hours per week — the hours you can charge clients for, not total hours worked.
- Hourly rate — your charged rate per billable hour.
- Working weeks per year — total weeks minus vacation, holidays, and sick leave (commonly 46–48).
Worked example
25 billable hours/week at $100/hour over 48 weeks:
Weekly revenue = 25 × $100 = $2,500
Annual revenue = $2,500 × 48 = $120,000
Monthly revenue = $120,000 / 12 = $10,000A freelancer billing 25 hours a week at $100 grosses $120,000 a year. Now notice the leverage of billable hours. If you could lift billable hours from 25 to 30 per week — by offloading admin or tightening your sales process — at the same rate:
Annual revenue = 30 × $100 × 48 = $144,000Five more billable hours per week adds $24,000 a year. The same lift could come from raising your rate instead: 25 hours at $120 also yields $144,000. Hours and rate are the two levers, and this calculator lets you see which one moves your income more for your situation.
Benchmarks
The number that surprises people is how few hours are actually billable:
- Full-time freelancers commonly bill 20–30 hours per week while working 40+. The gap is unpaid business-running time.
- Agency billable staff are measured on utilization and often target 70–85% of available hours as billable.
- Working weeks of 46–48 reflect realistic time off.
If you assume you’ll bill 40 hours a week, your revenue projection will overshoot reality badly. Plan with honest billable hours and treat anything above as upside.
How to interpret and use it
Use this calculator in two directions. Forward, it projects income from a given workload and rate — useful for deciding whether your current pricing supports your goals. Backward, it helps you reverse-engineer the rate or hours you need: if you want $150,000 a year and can bill 25 hours over 48 weeks, you need a rate of $125/hour ($150,000 ÷ 1,200 billable hours).
The strategic insight is that billable hours are capped but your rate is not. There are only so many hours in a week, and pushing billable hours too high (above ~30 for a solo operator) usually means neglecting the sales and admin that keep the pipeline full — or sliding toward burnout. That makes rate increases, niching down, and moving to value-based project pricing the more scalable paths to higher income once your hours are full.
Pair this with a utilization-rate check to see how much of your available time is actually billable, and with the freelance hourly rate calculator to confirm your rate covers expenses and your income target — not just your gross revenue.
Frequently asked questions
What are billable hours? Billable hours are the hours you can actually charge a client for — the work directly tied to deliverables. They exclude admin, sales, marketing, and other unpaid time that fills a freelancer’s week.
How is annual revenue calculated here? Multiply your billable hours per week by your hourly rate to get weekly revenue, then multiply by your working weeks per year. Monthly revenue is the annual figure divided by 12.