The billable hours calculator above converts a working year into sellable hours, then works backwards from what you need to earn to the rate those hours have to carry. It handles the two things that quietly wreck hourly pricing: the hours that never reach an invoice, and the invoiced work that never gets collected.
Arb Digital works with consultancies, agencies, and independent professionals whose pricing was set years ago against a working year that no longer exists. This page shows the arithmetic behind the rate, so the number is defensible rather than inherited.
What This Billable Hours Calculator Does
It multiplies your weekly hours by working weeks to get total capacity, applies your utilisation rate to find billable hours, and divides the revenue you need by those hours to produce a required rate. The revenue figure is your target income plus your annual business costs, grossed up by your collection rate so that write-offs and bad debt are covered rather than absorbed.
Alongside that, it shows what the rate would be if every working hour were billable. The gap between the two figures is the cost of non-billable time, expressed as the percentage uplift your billable hours have to carry. Most people have never seen that number, and it is usually larger than they expect.
How to Use It
- Enter hours per week and working weeks. Subtract annual leave, public holidays, and a realistic allowance for sick days from 52 before entering weeks.
- Enter your utilisation rate. If you track time, take billable hours divided by total hours worked over the last quarter. If you do not track time, this is the number worth measuring first.
- Enter target income and business costs. Income is what you want to take from the business. Costs are everything the business spends to keep operating.
- Set your collection rate. Invoiced value you actually receive, after discounts, write-downs, and unpaid invoices.
- Compare the required rate against what you currently charge. If your rate is below it, the year does not reach the target regardless of how hard you work.
The Formula / How It's Calculated
Capacity is Hours per Week × Working Weeks. At 40 hours across 46 weeks that is 1,840 hours. Billable hours are Capacity × Utilisation, so at 65% utilisation, 1,196 hours.
Required revenue is Target Income + Business Costs, or $90,000 + $30,000 = $120,000. Grossing that up for a 95% collection rate gives $120,000 ÷ 0.95 = $126,316 of work that must be invoiced. The required billable rate is that figure divided by billable hours: $126,316 ÷ 1,196 = $105.62 per hour.
The comparison figure is what the rate would be if utilisation were 100% and collection perfect: $120,000 ÷ 1,840 = $65.22. The uplift is (105.62 ÷ 65.22) − 1, or about 62%. That 62% is not margin, ambition, or market positioning. It is the arithmetic consequence of only 65 hours in every 100 reaching an invoice.
Why Utilisation Moves Your Rate More Than Anything Else
Because utilisation sits in the denominator, its effect on the required rate is non-linear. Moving from 65% to 75% utilisation on the same targets drops the required rate from $105.62 to about $91.54 — a 13% reduction in the price you need to charge, achieved without changing anything a client sees. Moving the other way, from 65% down to 55%, pushes the required rate to about $124.83.
That sensitivity is why utilisation deserves measurement before rates get renegotiated. A firm struggling to win work at its current rate may have a utilisation problem rather than a pricing problem, and the two have completely different solutions. Raising rates in a market that is already resistant is difficult; removing four hours a week of avoidable admin is often not.
The Non-Billable Hours That Are Not Waste
It is tempting to read non-billable time as inefficiency to be eliminated. Much of it is the opposite. Sales conversations, proposals, and relationship work generate the pipeline that fills the billable hours. Training and skills development are what allow the rate to rise over time. Internal process improvement compounds. A firm that drives utilisation to 90% by cutting all of it will have an excellent quarter followed by an empty pipeline.
The useful distinction is between investment non-billable time and administrative drag. Chasing invoices, rekeying data between systems, and reformatting reports are drag. Business development and capability building are investment. Splitting your non-billable hours into those two categories for a single month is usually more revealing than any pricing exercise, because it shows which half of the gap is actually recoverable.
Collection Rate: The Silent Discount
Realisation and collection are where hourly businesses lose money without noticing. Hours written down before invoicing because the job overran, discounts applied to keep a client happy, and invoices that are eventually written off all reduce the effective rate below the headline rate. A firm charging $120 an hour with a 90% collection rate is a firm charging $108 an hour, and no rate card reflects that.
Because collection sits in the same denominator position as utilisation, it has the same amplifying effect. A ten-point drop in collection requires an eleven percent rate increase to stand still. Tightening payment terms, invoicing more frequently, and taking deposits on new clients all change this number, and they change it faster than a price increase moves through a client base. The working capital calculator shows what the same collection delays are doing to your cash position at the same time.
Hourly Rates, Day Rates, and Fixed Fees
The required rate this tool produces is the floor beneath any pricing model, not an instruction to bill by the hour. Convert it to a day rate by multiplying by billable hours in a day — noting that a billed day is rarely eight billable hours once travel and context switching are counted. Convert it to a fixed fee by multiplying by the hours a piece of work realistically takes, including revisions.
Fixed fees change who carries the risk of overrun, which is the entire argument for and against them. Priced from an honest hours estimate and delivered efficiently, a fixed fee earns more per hour than the rate card. Priced from an optimistic estimate, it earns considerably less, and the client never sees the difference. The project profitability calculator settles that question after the fact by converting a fee back into an effective hourly yield, and the freelance hourly rate calculator approaches the same problem from an independent's perspective.
Where the Rate Meets the Market
A required rate is a statement about your cost base and capacity, not about what clients will pay. If the calculation produces a number the market will not bear, the arithmetic has still done its job: it has told you that the current combination of target income, cost base, working weeks, and utilisation is not achievable at market rates, and that one of those four has to change.
That reframing is more useful than a pricing debate, because it identifies which lever is available. Costs can be reduced. Utilisation can be improved. Working weeks can be increased, at a personal cost worth naming. Or the work can be repositioned so that a higher rate is defensible. For the underlying cost structure behind employed team members, the employee cost calculator gives the loaded cost per productive hour that any team rate must exceed. General guidance on business expenses and record-keeping for small businesses is published by the IRS in Publication 334, Tax Guide for Small Business, and the U.S. Small Business Administration covers the surrounding financial management basics.
Arb Digital builds the demand side for professional services firms — the site, the search visibility, and the enquiry flow that keeps billable capacity full.
Talk to Arb Digital Browse Free ToolsCommon Mistakes to Avoid
- Dividing target income by 2,080 hours — it assumes no leave, no admin, and no unpaid invoices, and produces a rate far below what the year requires.
- Guessing utilisation instead of measuring it — estimates are almost always optimistic, and the error flows straight into the rate.
- Leaving business costs out of the target — software, insurance, and equipment are paid from the same invoices as your income.
- Ignoring collection rate — write-downs and bad debt are a permanent discount on your headline rate.
- Treating all non-billable time as waste — sales and skills work is what keeps the billable hours available in the first place.
Related Free Tools From Arb Digital
Cross-check an independent rate with the freelance hourly rate calculator, cost the team side with the employee cost calculator, test whether a specific engagement actually earned its rate with the project profitability calculator, and check the cash impact of slow payers with the working capital calculator. Browse the full free online tools hub for more.
Frequently Asked Questions
Multiply your weekly working hours by the number of working weeks left after leave, holidays, and sick days, then multiply by your utilisation rate. At 40 hours across 46 weeks with 65% utilisation, that is 1,196 billable hours.
The proportion of your worked hours that ends up billed to a client. Time spent on proposals, admin, internal meetings, training, and business development is real work but not billable, so it sits outside the numerator.
Because only part of your year is billable and only part of what you invoice is collected. Both reduce the hours and the value available to cover the same target, so the rate on the hours that do get billed has to rise to compensate.
Yes, and more than proportionally, because utilisation sits in the denominator. Moving from 65% to 75% on the same targets cuts the required rate by around 13% without changing anything the client sees.
It is the share of invoiced value you actually receive after write-downs, discounts, and bad debt. A 90% collection rate turns a $120 headline rate into an effective $108, which is why it belongs in the calculation rather than as an afterthought.
The required hourly figure is the floor beneath any pricing model. For a day rate, multiply by the billable hours in a working day. For a fixed fee, multiply by an honest estimate of the hours the work will take, including revisions.
Then the current combination of target income, cost base, working weeks, and utilisation is not achievable at market rates. The calculation identifies which of those four inputs would have to change, which is more actionable than a general pricing discussion.
Figures produced by this tool are planning estimates only and do not constitute financial, tax, or accounting advice. Rates, costs, and tax treatment vary by market and jurisdiction.
