There is no fixed number, because billable hours are a fraction of hours worked and the fraction is yours. A 47 week year at 40 hours is 1,880 hours at work. Bill 75 percent of them and you reach 1,410. The table below recomputes that across the realistic range.
The question gets asked as though a year holds a set quantity of billable hours the way it holds 365 days. Two numbers decide the answer, and only one of them is a calendar fact.
Why is there no single answer?
Because a billable hour is time attributable to one client and one identifiable task, and most of a working week is not that. Proposals, invoicing, bookkeeping, professional reading, internal meetings and the general work of being findable are all real work that no client is charged for. The split is worked through in billable vs. non-billable hours, and what qualifies on the billable side is in what are billable hours.
So the answer is a product of two things: how many hours you are at work in a year, and what share of them survive that test. The first is close to a fact. The second is a property of how your days actually go, which is why nobody can tell you the answer from the outside.
How many hours are in a working year before anything is billed?
The familiar figure is 2,080, from 52 weeks at 40 hours. The US Office of Personnel Management points out what that quietly assumes: 52 weeks is 364 days, not 365 or 366. Until 1984 federal hourly rates were computed on that divisor, and a General Accounting Office study published in 1981 showed it was slightly low.
Over the 28 years it takes the calendar to repeat, OPM reports 4 years with 262 workdays, 17 years with 261, and 7 years with 260. At 8 hours a day that is 2,096, 2,088 and 2,080 hours. The average is:
(2,096 x 4) + (2,088 x 17) + (2,080 x 7) = 8,384 + 35,496 + 14,560 = 58,440, and 58,440 divided by 28 is 2,087.14.
That is where the 2,087-hour divisor in US federal pay comes from, made permanent in 1986. The 8-hour day is an assumption of the arithmetic, not of the statute.
Neither figure is the year you will have, because both count every workday as worked. Take 52 weeks, remove 3 weeks of vacation and 2 weeks of public holidays, and 47 working weeks remain. At 40 hours that is 47 x 40 = 1,880 hours at work, about 10 percent below the headline number before a single sick day. Working hours in a year sets the four common figures side by side.
What do the numbers look like at each utilization level?
Utilization is billable hours divided by hours at work. Every cell below is 47 working weeks multiplied out, and then the same weekly figure across a full 52 weeks for comparison. Nothing here is a benchmark. It is one multiplication, run at inputs that actually occur.
| Hours at work each week | Utilization | Billable each week | Billable in 47 weeks | Billable in 52 weeks |
|---|---|---|---|---|
| 35 | 60 percent | 21 | 987 | 1,092 |
| 40 | 50 percent | 20 | 940 | 1,040 |
| 40 | 60 percent | 24 | 1,128 | 1,248 |
| 40 | 70 percent | 28 | 1,316 | 1,456 |
| 40 | 75 percent | 30 | 1,410 | 1,560 |
| 40 | 80 percent | 32 | 1,504 | 1,664 |
| 45 | 75 percent | 33.75 | 1,586.25 | 1,755 |
| 50 | 75 percent | 37.5 | 1,762.5 | 1,950 |
| 50 | 80 percent | 40 | 1,880 | 2,080 |
| 60 | 70 percent | 42 | 1,974 | 2,184 |
Two things fall out of the table. A ten point move in utilization is worth more than five extra hours a week at the desk: 40 hours at 80 percent gives 1,504, while 45 hours at 75 percent gives 1,586.25, so the longer week buys 82.25 hours while the ten points from 70 to 80 percent buys 188. And the top row of the range is reached by working sixty-hour weeks, not by billing more of a normal one.
If you want to run your own inputs rather than read off a row, the billable hours calculator does this arithmetic live, and the hours calculator handles the start and stop times underneath it.
One note on the unit. Billing is conventionally recorded in tenths of an hour, because six minutes is one tenth and multiplies cleanly against a rate. The US District Court for the Northern District of California publishes the conversion for appointed counsel: 1 to 6 minutes is 0.1, and 25 to 30 minutes is 0.5. A year of 1,410 billable hours is therefore 14,100 tenths, entered a few at a time. Decimal hours covers the conversion and where the rounding conventions disagree.
What do law firms actually target?
This is the one place where a published figure exists, and it belongs to one industry in one country. Yale Law School’s Career Development Office states that law firms’ stated average, target or minimum billables “typically range between 1700 and 2300”, and notes that the NALP Directory of Legal Employers carries firm-by-firm data although many firms choose not to share it. It also says public interest firms, smaller firms and firms outside large metropolitan areas often require fewer billable hours.
The same document works a day. Eight in the morning to six in the evening is 10 hours. Subtract an hour for lunch, half an hour for two short breaks, half an hour for reading legal updates and correspondence, and half an hour for department meetings and continuing education, and 7.5 hours are left to bill. That is 75 percent utilization. Five days is 37.5 billed against 50 at work, and 37.5 x 47 = 1,762.5, which the document prints as 1762.
Their higher target is more revealing. A twelve-hour day less two hours for meals, one hour of breaks and half an hour of meetings leaves 8.5 billable, so 42.5 a week and 42.5 x 47 = 1,997.5, printed as 1997. Adding three Saturdays a month for part of the year gets the total to 2,201 billed, against 3,058 hours at work. That is a utilization of 2,201 divided by 3,058, or about 72 percent, reached by being at work for the equivalent of 65 hours a week.
Those are US law firm figures from a US law school, quoted as context. They are not a target for a freelancer, a consultant or anyone outside that industry, and treating them as one is how the number gets chased instead of measured.
How many billable hours is that in a month or a week?
Divide, but divide honestly. At 1,410 billable hours a year, 1,410 divided by 12 is 117.5 a month and 1,410 divided by 47 is 30 a week. The monthly figure is the one to distrust: vacation and holidays land in particular months, so an August with two weeks off holds nothing like a twelfth of the year. If you need a monthly number for planning, count the working weeks in that specific month and multiply, the way how to calculate work hours does it for a timesheet.
Is there a ceiling on any of this?
There are legal limits on hours worked in some places, and they are not limits on hours billed. In the United Kingdom, GOV.UK states that you cannot work more than 48 hours a week on average, normally averaged over 17 weeks, with exceptions for certain roles and the option for a worker to opt out. Sustained across 47 working weeks, 48 x 47 = 2,256 hours at work, and 75 percent of that is 1,692 billable. Rules differ by country and by contract, so check the ones that apply to you rather than the arithmetic above.
Which number should you actually use?
Use 2,080 when you need a divisor other people will recognize. Use 2,087 when you are matching US federal pay arithmetic, because that figure is written into the rule. Use 1,880, or your own equivalent after your real time off, when you are planning what the year can hold. And when you are pricing, use your own measured billable total rather than any row in the table above, because the difference between hours at work and hours sold is a property of your weeks, not a number you can pick.
That last one is the only figure here you cannot look up, and it is the one people guess. Timeness exists for exactly that step: make an activity per client or per project, tap once to start and once to switch, and at the end of a quarter the month and year charts show what your utilization actually was instead of what you assumed. Export the whole history as CSV or JSON and total it however you like. The app records time and nothing else, so the rate arithmetic stays in the calculator on this page and the invoice stays wherever you already send it.
Then run the table again with your own two numbers. A time audit over four weeks usually replaces both guesses with measurements.
Sources
- US Office of Personnel Management: Computing Hourly Rates of Pay Using the 2,087-Hour Divisor
- Yale Law School Career Development Office: The Truth About the Billable Hour
- US District Court for the Northern District of California: Billing Increment Chart, Minutes to Tenths of an Hour
- GOV.UK: Maximum weekly working hours