Freelance Day Rate: How to Work It Out (With the Formula)

Your freelance day rate is what you need to earn in a year, divided by the number of days you can actually bill for — not a number that "feels about right" compared to other freelancers. The formula is: (target income + business costs) ÷ realistic billable days = day rate. Most people get this wrong in one specific place: they divide by roughly 220 working days a year, when the realistic number — after admin, marketing, gaps between clients, and holiday — is closer to 100–150. Below is the full formula, worked through with real numbers, and a link to a calculator that does the arithmetic for you.

The formula, step by step

1. Decide your target income. What you actually need to earn in a year, after tax, to live on and save — not what you currently make, what you need.
2. Add your business costs. Software subscriptions, insurance, equipment, a portion of a coworking desk or studio, an accountant — the real annual cost of running the business, on top of your income.
3. Count your realistic billable days. Start from working days in a year (roughly 260), then subtract holiday, sick days, and — this is the step almost everyone skips — the days spent on admin, marketing, proposals, and the gaps between one client ending and the next starting.
4. Divide. (Target income + business costs) ÷ realistic billable days = your day rate.

If you'd rather have this filled in automatically with your own numbers, the day-rate calculator runs this exact formula — enter your target income and it works out the rate for you.

Why "realistic billable days" is the number that matters most

This is where almost every underpriced freelancer goes wrong. It's tempting to count working days as roughly five days a week, 48 weeks a year — around 240 days — and divide by that. But that number assumes every single working day is billed to a client, with zero time spent on invoicing, proposals, marketing, admin, illness, or the inevitable week between one project ending and the next one starting.

A more honest estimate, for most solo businesses in year two or three, lands somewhere between 100 and 150 billable days a year — roughly 40–60% of total working days. Someone who's just started out, with more gaps between clients, should count even fewer. This single adjustment is usually what separates a rate that quietly runs the business at a loss from one that actually covers it.

A worked example

Sofia, an illustrator, wants to earn £42,000 after tax this year and estimates her annual business costs — software, insurance, a portion of her studio rent — at £6,000.

• Target income: £42,000
• Business costs: £6,000
• Total needed: £48,000
• Realistic billable days: 120 (roughly 2.5 days a week billed, once admin and gaps are accounted for)
• Day rate: £48,000 ÷ 120 = £400/day

If Sofia had divided by 220 working days instead — the naive version — she'd have landed on roughly £218/day, a rate that only covers her costs and target income if every single working day is billed, which almost never happens in practice.

A quick sense-check

Once you have a number, run it against two checks before you commit to it:

• Does it survive a slow month? If a third of your billable days evaporated next month, would the rate you picked still get you close to your target for the year, or does it depend on every month being a full one?
• Does it match the value of the work, not just your costs? A rate built purely from your own expenses is a floor, not a ceiling — for specialised or high-stakes work, the client's own value from the outcome can justify pricing above the formula's baseline.

For project-based work rather than day rates specifically, how to price a project when you don't know what to charge walks through the same target-income logic applied to a fixed scope instead of a day. And once you've quoted a number with confidence, how to write a freelance proposal is where that price gets stated plainly, without hedging.

The copy-paste prompt

If you'd rather talk through the numbers than fill in a calculator, this prompt runs the same formula conversationally and flags anything that looks off.

You are a plainspoken pricing assistant helping a freelancer or solo business owner work
out their day rate using this formula: (target income + business costs) / realistic
billable days = day rate.

Context:
- Target annual income, after tax: [AMOUNT]
- Estimated annual business costs (software, insurance, equipment, workspace): [AMOUNT]
- My best guess at billable days per year: [NUMBER]
- How many years I've been doing this full-time: [NUMBER]

Task: calculate the day rate using the formula above. If my billable-days guess looks
unrealistically high for someone at my experience level (more than roughly 150 for someone
under three years in, or an unexplained near-240), flag it plainly and show the rate at a
more realistic figure alongside my original one, so I can compare both.

Constraints: show the arithmetic, not just the final number. Don't tell me whether the rate
is "too low" or "too high" compared to other freelancers — only whether it covers what I
told you I need.

FAQ

How many billable days should I plan for in a year, realistically?

Most solo businesses land somewhere between 100 and 150 billable days a year once admin, marketing, holidays, and gaps between clients are subtracted from the full working year — rarely close to 220.

Should my day rate include business costs, or just my own income?

Include both. A rate built only from take-home pay quietly leaves you covering software, insurance, and equipment out of what should have been profit.

Is it normal for a day rate to feel too high at first?

Yes. A rate built from real arithmetic is usually higher than a guessed one, because guesses tend to undercount how few days in a year are actually billable.

Working out a rate is one of 30 ready-made workflows in the AI Business OS, alongside the proposal and invoice-chasing prompts that help you actually get paid it.