Billable Hours Calculator

What this calculator does

Freelancers and contractors sell time, and only part of that time is billable. Admin, pitching, scheduling, learning, sick days and the gaps between projects all consume hours no client pays for. This separates total working time from billable time and returns the annual billable figure that most rate-setting and revenue projection rests on. The headline is annual billable hours; the supporting rows give the monthly and weekly equivalents, the annual non-billable total, and revenue when a rate is entered.

How the math works

It is a linear product: BH = h × w × (u ÷ 100), with h as weekly working hours, w as weeks worked and u as billable utilisation. Monthly billable divides the annual figure by twelve; weekly billable is hours times utilisation. Annual non-billable is total working hours less billable hours. Everything is steady state: the entered figures are assumed to hold across every week, with no month-to-month variation modelled.

Worked example

Forty working hours a week, 65 percent billable utilisation, 46 working weeks after leave and gaps, and a rate of 100. Annual billable hours are 40 × 46 × 0.65 = 1,196. Monthly billable is 100, weekly billable 26. Annual non-billable comes to (40 × 46) − 1,196 = 644, which is 35 percent of total working time. Revenue at the entered rate is 1,196 × 100 = 119,600.

Utilisation carries the result harder than it looks. Drop it to 55 percent and change nothing else: billable hours fall to 1,012 and revenue to 101,200, which is 18,400 less for exactly the same hours at the desk. Ten percentage points of utilisation is worth more here than a rate rise most clients would notice.

Where utilisation typically sits

Published figures vary by survey, role and operating model, and the spread inside any one segment is usually wider than the spread between segments. Solo practitioners, agency staff under formal utilisation tracking, and part-timers whose day job absorbs the non-billable work all sit in different places, and early-career freelancers sit lower because pipeline building takes real hours.

Any single benchmark is a reference point rather than a target, and it is also a local one: Eurostat's structural business statistics describe professional services across the EU and say nothing about how the same work is organised elsewhere. The purpose here is to surface your own figure, not to assert an industry number.

How utilisation connects to rate

An annual income target divided by annual billable hours gives the rate that target requires. A 100,000 target across 1,250 billable hours needs about 80 an hour; the same target across 1,800 hours needs about 56. Both work, and they are reached differently: fewer hours priced higher, or more hours priced lower. What constrains the choice is what clients will pay at the top end and what a person can sustain at the other. The rate-from-target arithmetic runs directly in the freelance rate calculator.

What eats non-billable hours

Invoicing, scheduling and client communication outside billed time. Pitching, networking and whatever passes for marketing. Learning, and keeping tools and systems working. Tax and bookkeeping. Unpaid leave. The mix is individual, but the direction of the error is not: tracking a few weeks properly almost always returns a lower billable share than the same person would have estimated, because billable work is memorable and the gaps between projects are not.

Lifting the billable share without lengthening the week

Adding hours is the obvious lever and the worst one. The joint WHO and ILO assessment found weeks of 55 hours or more carry measurably higher stroke and heart disease risk, which puts a hard edge on a lever that already degrades work quality well before that point.

The alternatives move hours between categories instead of adding them: batching admin into blocks rather than interleaving it, handing bookkeeping or scheduling to someone else, building templates and onboarding flows that cut per-client setup, charging for scoping that used to be absorbed, and shifting toward retainers that carry less pitching overhead than transactional work. Whether any of them lifts a particular practice's utilisation depends on where its time actually goes, and each carries a cost of its own.

Tracking versus estimating

Estimated and tracked utilisation rarely agree. A tracker measures minutes against project codes and shows the gap between what someone believes their week looked like and what it was. A few weeks is usually enough to expose the patterns: some days run far higher than others, some client mixes carry more administrative drag, some project types quietly consume more unbilled time than the fee assumed. This calculator runs on whatever figure is entered, and a tracked one produces a projection worth acting on where an estimated one produces a flattering guess.