What Are Billable Hours?
Billable hours are the hours you can directly charge a client for — time spent doing actual, agreed client work. Everything else — the emails, the proposals, the invoicing, the accounting, the marketing, the portfolio updates — is overhead. Necessary, but unbillable.
This distinction matters enormously when setting your rate. A new freelancer who assumes they'll bill 35–40 hours a week is setting themselves up for one of two outcomes: serious undercharging, or serious burnout. Usually both.
Where Does a Freelance Week Actually Go?
A typical full-time freelancer's 40-hour week breaks down roughly like this — though it varies significantly by discipline, career stage, and how established the business is:
40-Hour Week Breakdown (Established Freelancer)
The result: roughly 20–25 billable hours in a 40-hour week, once you account for everything that doesn't go on an invoice. This is a healthy, sustainable ratio for an established freelancer. New freelancers often have even lower billable ratios initially, as business development demands more time.
Assuming you'll bill 40 hours/week and pricing your rate accordingly. At 40 billable hours you'd need to work 60–70 hours total to cover your overhead. Sustaining that for more than a few months leads to burnout, missed deadlines, and client relationship damage. Price for 20–25 billable hours and you build in sustainability from day one.
Billable Hours by Career Stage
| Career Stage | Realistic Billable Hrs/Week | Why |
|---|---|---|
| First year freelancing | 10–18 hrs | High time investment in finding clients, learning operations, building systems |
| Established (2–4 years) | 18–25 hrs | Steady client base, streamlined ops, but still active new business development |
| Well-established (4+ years) | 22–30 hrs | Strong referral network, repeat clients, systems that reduce admin overhead |
| Retainer-heavy business | 28–35 hrs | Recurring guaranteed work drastically reduces business development overhead |
How Billable Hours Directly Affect Your Required Rate
This is the most important relationship to understand. Your billable hours are the denominator in your rate calculation. A lower denominator means a higher required rate.
| Annual Revenue Needed | Billable Hrs/Week | Working Weeks | Required Hourly Rate |
|---|---|---|---|
| £60,000 | 15 | 48 | £83/hr |
| £60,000 | 20 | 48 | £63/hr |
| £60,000 | 25 | 48 | £50/hr |
| £60,000 | 30 | 48 | £42/hr |
| £80,000 | 20 | 48 | £83/hr |
| £80,000 | 25 | 48 | £67/hr |
The difference between billing 15 and 25 hours per week at the same income target is £33/hour. This is why getting your billable hour estimate right when using the Freelance Rate Calculator is so important — it has the biggest single impact on your output rate.
How to Increase Your Billable Ratio
You can increase your effective income without raising your rate, by spending more of your working time on billable work. Here's what actually moves the needle:
1. Build a retainer client base
Retainer clients pay a fixed monthly fee for a guaranteed allocation of your time. The business development work happens once (landing the retainer) rather than repeatedly. A freelancer with 50% of their income on retainer can redirect much of their previous prospecting time to billable work.
2. Batch your admin ruthlessly
Admin tasks expand to fill the time you give them. Block a specific time each week for invoicing, email, bookkeeping, and scheduling — say, Friday afternoon — and protect the rest of your working time for client work. Many freelancers find they can handle all admin in 3–4 focused hours rather than 8+ hours of fragmented time.
3. Systematise repeated processes
Every repeated task that currently requires fresh thinking is a candidate for systematisation. Proposal templates, contract templates, onboarding sequences, project kickoff questionnaires — all of these reduce the overhead per new client, increasing the proportion of time spent on actual work.
4. Raise the bar for new clients
Some clients consume vastly more admin time than others — frequent unclear requests, slow sign-offs, chaotic communication. As you establish yourself, you can be more selective. A difficult client at £50/hour might deliver worse effective income than an easy client at £40/hour once admin overhead is factored in.
Tracking Your Billable Hours
You can't optimise what you don't measure. Even if you don't charge by the hour, tracking your time for a few weeks reveals your actual billable ratio and shows where your non-billable time is going.
Simple tools that work well: Toggl Track (free tier is sufficient), Clockify, or even a basic spreadsheet with daily logs. The goal isn't to achieve perfect records forever — it's to understand your baseline so you can set your rate and working patterns accurately.
When using the Freelance Rate Calculator, use your realistic billable hours — not your total working hours. If you work 40 hours/week but only 22 of those are billable, enter 22. Your resulting rate will be higher, but it will be accurate. Entering 40 will give you a rate that makes the business unviable.
Frequently Asked Questions
What are billable hours for a freelancer?
Billable hours are the hours you can charge a client for — time doing actual client work. They exclude admin, business development, marketing, invoicing, learning, and all the other overhead that keeps the business running but can't be passed on to a client.
How many billable hours per week should a freelancer aim for?
A realistic sustainable target for a full-time freelancer is 20–25 billable hours per week. Billing 30+ requires either a very established referral-heavy business or working significantly more than 40 hours total. New freelancers should expect 10–18 billable hours initially.
How do I increase my billable hours without working more?
Build a retainer client base, batch admin tasks into specific time blocks, systematise repeated processes, and gradually increase selectivity about which clients you take on. These changes can shift your billable ratio from 45% to 60%+ without adding working hours.
Should I track my time even if I don't charge by the hour?
Yes — for at least a few weeks per year. Time tracking reveals your actual billable ratio, helps you identify where unbillable overhead is hiding, and gives you accurate data for project estimating. Even project-based freelancers benefit from knowing their true effective hourly rate on each job.