How to Calculate Billable Hours, Utilization and Annual Revenue

Billable vs non-billable time

Not every hour you work earns money. Client delivery is billable; the emails, invoicing, sales calls, proposals and skill-building around it usually are not. Both are real work, but only one shows up on an invoice. The first job in calculating billable hours is drawing that line honestly, because a fuzzy line quietly inflates how productive you think you are.

Non-billable time is not waste — sales work wins the next contract, and admin keeps the business running. The goal is not to eliminate it but to see it clearly, so you know how much of your week actually turns into revenue and can decide what to reduce, delegate or automate.

Utilization: the ratio that drives revenue

Utilization is the share of your working time that is billable — billable hours ÷ total hours × 100. If you work 40 hours and 25 are billable, utilization is 62.5%. It is one of the most revealing metrics in a services business because it links effort to income: two people can work the same hours yet earn very differently if one bills 50% of the time and the other 75%.

For many freelancers and agencies a sustainable utilization sits somewhere in the 60–80% range; pushing much higher tends to squeeze out the sales and admin the business needs to keep going. Raising utilization even a few points often adds more revenue than a rate increase, and without asking clients to pay more.

Projecting annual revenue

Once you know your weekly billable hours and rate, projecting a year is straightforward: billable hours per week × working weeks × hourly rate. At 25 billable hours a week, 46 working weeks and $90 an hour, that is 1,150 hours and about $103,500 a year. Crucially, use working weeks — not 52 — so holidays, sick days and slow periods are baked in rather than flattering the total.

This projection is a planning tool, not a promise. It shows the ceiling your current hours and rate can reach, which makes the trade-offs visible: a higher rate, more billable hours, or a better utilization ratio each move the number, and a calculator lets you test all three in seconds before you commit.

Frequently asked questions

What is a good billable hours ratio?

For many freelancers and agencies, a sustainable utilization sits around 60–80%. Below that, non-billable work is eating your week; much above it, you risk having no time left for sales, admin and rest. The right target depends on your business model — a solo consultant carries more non-billable overhead than someone in a large team with support functions.

How many billable hours are there in a year?

It depends on your hours and utilization, not the calendar. If you work roughly 46 weeks after holidays and bill 25 hours a week, that is about 1,150 billable hours a year. A full-time schedule at high utilization can approach 1,600–1,800, but chasing that number usually means cutting the sales and admin the business needs.

Should I raise my rate or my billable hours?

Both raise revenue, but they cost you differently. Lifting your rate adds income without more hours, though clients may push back. Lifting billable hours — often by cutting non-billable time — grows revenue without asking clients to pay more, but has a ceiling set by your capacity. Test both in a calculator and pick the one with the most headroom for your situation.

Do I count time I can't invoice, like sick days?

For utilization, count only actual hours worked, split into billable and non-billable — do not include days off or sick days in the total. But for annual projections, reflect that time off by using realistic working weeks, such as around 46 rather than 52, so holidays and sick leave lower the yearly figure honestly.