How to Calculate an Hourly or Day Rate
A step-by-step method for setting a rate that covers your costs, your time off, and a genuine profit — instead of dividing last year's salary by 365.
Written by Daniel, peer-reviewed by Sarah
Last reviewed:
Published:
Who this is for: Freelancers, tradespeople and consultants who set a rate once, early on, and have never recalculated it properly since.
The short answer
Start from what you need, not what feels reasonable
A day rate built from 'what sounds about right' tends to anchor on what an employee might earn, forgetting that a business has costs an employee does not: your own tax, insurance, equipment, admin time, and periods with no income at all. Ignoring these necessary costs can leave you underfunded and stressed.
Instead, start with the income you need to live on, add what the business needs to run and to make a profit, and only then work out the rate that produces that total. This approach ensures you're covering all your bases, not just surviving on guesswork.
If you try to reverse-engineer a rate based on what you think the client wants to pay, you will always end up subsidising their project with your own unpaid time. It's critical to value your expertise appropriately to maintain a sustainable business.
Billable days are far fewer than working days
A UK working year has around 260 weekdays. Once you remove holiday, illness, admin, marketing, quoting, training, and gaps between jobs, most self-employed people can realistically bill somewhere between 120 and 180 days a year — often fewer in the first year or two. The number of genuinely productive days is always lower than first assumed.
Dividing your target income by 260 days, rather than your realistic billable days, is the single most common reason day rates are too low. Overestimating working days leads to significant shortfalls in income.
Understanding the difference between working and billable days can prevent financial shortfalls. Many underestimate the impact non-billable tasks have on productivity, resulting in ineffective planning.
- Annual leave and public holidays you still need to take (typically 25-30 days).
- Illness and family time, which the self-employed rarely plan for but always experience (allow 5-10 days).
- Non-billable work: quoting, invoicing, marketing, admin, training (often 1 day a week, or 50 days a year).
- Gaps between contracts or jobs, which are normal even in a healthy business (allow 20-30 days).
- Unexpected life events that can affect your availability (allow a buffer of 10 additional days).
Build the rate in five numbers
Once you have realistic billable days, the calculation itself is simple arithmetic: target income, plus overheads, plus profit, divided by billable days. The skill is in being honest about each input, particularly billable days and overheads, which owners consistently underestimate. Transparency in your calculations ensures comprehensive coverage of your business needs.
Convert day rate to hourly by dividing by a realistic number of billable hours in a working day — typically 5 to 6, not 8, once meetings, breaks and admin are accounted for. This accounts for the typical interruptions and administrative activities that come with self-employment.
This simplified structure does not just clarify the financial picture but prepares you for unforeseen expenses and drops in productivity, offering financial security.
Worked example: A freelance designer setting a day rate
- Target personal income
- £38,000
- Business overheads (software, insurance, equipment, marketing)
- £6,000
- Profit buffer for tax and reinvestment, 15%
- £6,600
- Total required income
- £50,600
- Realistic billable days per year
- 140
- Day rate required
- £362 (rounded to £365)
Illustrative example. Using 220 billable days instead of a realistic 140 would have produced a rate of just £230 - comfortable-looking, but £52,780 short of the income actually required across the year. This emphasizes the danger of basing calculations on overly optimistic assumptions.
What to do, in order
- 1
Set your target income
The amount you need to draw from the business, before tax, to live on comfortably. It should reflect your genuine living needs and include savings goals.
- 2
Add real business overheads
Include software, insurance, equipment, marketing, and professional fees on an annual basis. These costs are relatively fixed and should be expected each year.
- 3
Add a profit and tax buffer
A percentage on top, commonly 15-20%, to cover tax and leave genuine profit. This helps ensure long-term financial stability and allows you to reinvest in your business.
- 4
Count your realistic billable days
Be honest about holiday, illness, admin and gaps — not the number of days in the calendar. This realism ensures your expectations align with the operational realities of your business.
- 5
Divide to get your rate
Total required income divided by billable days gives your day rate; divide again by billable hours for an hourly rate. This ensures both day and hourly rates are financially sustainable.
- 6
Revisit annually
Recalculate every year, especially after a change in overheads, income needs, or billable capacity. Regularly reassessing keeps your rates aligned with market trends and personal financial goals.
Common mistakes
- Dividing target income by 220 or more billable days when the realistic figure is far lower.
- Forgetting to include tax and National Insurance in the profit buffer.
- Setting an hourly rate by dividing a day rate by 8 hours, ignoring admin and breaks.
- Never adjusting the rate once set, even as personal costs and overheads rise.
- Undercutting the calculated rate for the first client to win the work, then anchoring everyone else to that low figure.
- Failing to allocate time for personal development or skill growth, which can enhance service value and hence rates.
- Misjudging the frequency and impact of non-billable administrative tasks, which affects real earning potential.
- Ignoring market conditions and competitor rates entirely, which can render your pricing non-competitive or unsustainable.
If you only have five minutes
Important
Frequently asked questions
- How many billable days should I assume in year one?
- Fewer than an established business — often 100 to 130 days, since new client relationships and quoting take longer to convert into billable work. It's better to be conservative and pleasantly surprised than too optimistic and financially strained.
- Should VAT be included in my day rate calculation?
- No. Build your rate excluding VAT, then add VAT on top of invoices if you are VAT registered — it is collected on behalf of HMRC, not part of your income. This helps keep your calculations relevant to your take-home pay.
- Is it wrong to charge less than my calculated rate for a favourite client?
- Not necessarily, but do it as a conscious, limited decision rather than letting one discounted client quietly become the benchmark everyone else expects. Discounts can be strategic if applied carefully and sparingly.
- How do I adjust my rate if overheads increase mid-year?
- Factor the increased cost into a new, mid-year calculation of your day rate. It might mean an update communicated to new clients or increasing rates at agreed future contract renewals.
- What should I do if my calculated rate is strangely high compared to peers?
- Ensure all your numbers are correct, especially overheads and billable days. It can be useful to compare industry averages but also consider if your service includes unique value justify a higher rate.
Sources
Who wrote and checked this
Written by Daniel Mercer, who has run the numbers on his own small business and writes from that experience. Daniel is not an accountant or a regulated financial adviser. Who writes this site.
Peer reviewed by Sarah Chen, Chartered Accountant (FCA). Peer reviewers check for technical accuracy and compliance with current UK regulations.
Last reviewed: 7 August 2026
Do this next
Next steps
- 1
Put the numbers in: Sustainable Rate Calculator
Use your own figures rather than the worked example above.
Open the tool - 2
Read next: Contribution Margin: what each sale contributes before fixed costs
Calculate contribution per sale and contribution percentage, distinguish variable from fixed costs, and use the result to test pricing and growth decisions.
Read the guide - 3
Work through the Pricing & Profit hub
Price for the business you want, not the one you have.
Open the hub
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