What are billable hours

If you sell your time or expertise — as a designer, developer, consultant, accountant or agency — billable hours are the quiet number underneath everything. They decide how much you can earn, how many people you can hire and whether a busy month was actually a profitable one.

This guide explains what billable hours are, how to track them without making your team miserable, and how to use them to run a healthier business.

Billable vs non-billable hours

A billable hour is time spent on work you can charge a client for. Designing a client's homepage, writing their campaign copy, attending their review meeting or fixing a bug in their app are all billable.

A non-billable hour is time that keeps the business running but that no single client pays for directly:

• Sales calls, proposals and pitching
• Internal meetings and planning
• Admin, invoicing and bookkeeping
• Training, learning and hiring
• Work on your own website or portfolio

Non-billable work is not wasted time — without it, there would be no clients to bill. But it needs to be paid for by the billable hours, which is why tracking both matters.

Where the line sits is a business decision. Agree on it upfront, write it into your contracts and apply it consistently.

Some tasks sit in a grey area — a quick email reply, travel to a client's office, fixing your own mistake. There is no universal rule. What matters is that your team handles them the same way every time, and that the client knows what to expect.

How to calculate your billable rate

A common way to set an hourly rate is to work backwards from what the business needs to earn:

1. Add up your yearly costs — salaries (including your own), tools, rent, insurance and taxes.
2. Add your target profit — the margin you want on top of costs.
3. Estimate yearly billable hours — realistic hours, not every hour you are at work.
4. Divide the total by the billable hours.

For example, if your costs plus profit come to $120,000 and you expect to bill 1,200 hours a year, your rate needs to be at least $100 an hour.

That 1,200 figure surprises people. A full-time year is roughly 2,000 working hours, but holidays, sick days, sales and admin quickly eat into it. Planning around every hour being billable is the fastest way to underprice your work.

Utilization: the number to watch

Utilization rate is the share of working time that is billable:

utilization = billable hours ÷ total hours worked × 100

If someone works 40 hours in a week and 28 of them are billable, their utilization is 70%.

What counts as healthy depends on the role. People who mostly do client work often sit somewhere around 70–80%, while founders and managers — who sell, hire and run the business — will naturally be much lower. Aiming for 100% is a mistake: it leaves no time for learning, improving your process or simply breathing between projects.

Watch the trend rather than a single week. Utilization that keeps creeping up means you need to hire; utilization that keeps dropping means you need more sales.

How to track billable hours

Time tracking only works if people actually do it. A few habits make it painless:

• Track as you go. Start a timer when you begin a task, or log time at the end of each block of work. Reconstructing a week from memory on Friday afternoon is always wrong.
• Use clear project and task names, so hours map cleanly onto invoices and reports.
• Add short notes to each entry. "Homepage hero — second round of revisions" is far more useful to a client than "design".
• Round consistently. Many teams round to the nearest 6 or 15 minutes. Pick one rule and write it down.
• Review weekly. A quick check each week catches missing or mislabelled entries before they reach an invoice.

Most importantly, explain why you track time. When people understand it is about pricing work fairly and protecting them from overload — not about surveillance — they track far more accurately.

Billing clients fairly

Clear billing prevents most disputes. Good practice looks like this:

• Explain your terms at the start — your rate, your rounding rule, what is billable and how often you invoice.
• Share estimates, then report against them. Tell clients early if a task is running over, not when the invoice arrives.
• Itemise invoices with dates, tasks and hours, so clients can see exactly what they are paying for.
• Invoice on a regular schedule — weekly or monthly — rather than letting hours pile up.

Beyond hourly billing

Tracking billable hours does not mean you have to charge by the hour. Many agencies sell fixed-price projects or monthly retainers, and still track time internally. The hours tell you whether a fixed price was right, which projects are profitable and where your process needs work.

Whichever model you use, billable hours are the most honest measure of where your time goes. Track them carefully, review them regularly, and they will tell you exactly how to price, plan and grow.