Billable Hours Ratio Calculator

Understanding the billable hours ratio calculator — concept and principle

The billable hours ratio, also called utilisation, tells you what share of your working time can actually be invoiced to clients. Freelancers, consultants, agencies, law and accounting firms use it to set realistic rates, plan capacity and see how much admin, sales and learning time quietly eats into income.

Only 27 of 45 hours are billed, so a $70 rate earns $42 per hour actually worked.

How it is calculated

Billable ratio = billable hours ÷ total hours worked × 100.
Effective rate per hour worked = billable hours × hourly rate ÷ total hours worked.
Non-billable hours = total hours worked − billable hours.

Enter hours for the same period (the page uses one week) and the hourly rate you charge clients. The calculator works with any currency; the result is in the currency you select.

The principle

Clients pay only for billable hours, but you work all of them. Spreading the week's billings over every hour you spent gives the rate you really earn per hour of your life at work. The effective rate is simply the hourly rate multiplied by the billable ratio, so a 60% ratio means each hour you work earns 60% of your headline rate. Raising either the rate or the ratio lifts real earnings, which is why professional service firms track utilisation as closely as price.

Worked example

Inputs: 45 hours worked per week, 27 billable hours, hourly rate $70.
Billable ratio = 27 ÷ 45 × 100 = 60%.
Weekly billings = 27 × $70 = $1,890.
Effective rate = $1,890 ÷ 45 = $42.00 per hour worked.
Non-billable hours = 45 − 27 = 18 hours per week.

How to read the result

There is no universal target; it depends on the role. Someone who also sells, manages staff or builds products will naturally bill a smaller share than a person doing only delivery work. More useful than any benchmark is the trend: track the ratio monthly and compare the effective rate with the income you need. If the effective rate is too low, you can raise prices, cut or automate admin, or bundle unbilled tasks into your fees. A ratio close to 100% for long periods can also be a warning sign that there is no time left for sales, training or rest.

Common mistakes

Counting only "desk" time and forgetting email, travel, quoting and invoicing in total hours.
Setting a rate by dividing the income target by 40 hours a week, which assumes 100% utilisation.
Treating hours logged as billable when some of them will be written off or discounted.

Keep in mind: The calculation assumes every billable hour is invoiced and paid at the full rate. It ignores taxes, expenses, holidays and unpaid invoices, and it is not financial advice.

Frequently asked questions

What is a good billable utilisation rate?

It depends heavily on the role and firm. Compare yourself with your own history and with the rate you need to cover costs, rather than with a single industry number.

How do I use the ratio to set my hourly rate?

Divide the hourly income you need by your realistic billable ratio. If you need $42 per hour worked and bill 60% of your time, you must charge $42 ÷ 0.60 = $70.

Is unpaid time with clients billable?

Only if you actually invoice it. Free consultations and scoping calls are non-billable, even though they serve clients.

Sources: David H. Maister, Managing the Professional Service Firm (Free Press, 1993)

Checked 8 Nov 2026. Standard business and finance formulas. Estimates for information only.

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