How to calculate annual salary from a day rate
To convert a contractor or freelance day rate into an annual salary, multiply your day rate by the number of days you work each week and the total billable weeks you expect to work in a year.
Unlike permanent salaried employees whose annual compensation covers 52 paid weeks (including statutory paid annual leave and public holidays), contractors are only paid for the days they actively deliver work.
Most UK and international contractors base annual earnings on 44 to 48 billable weeks per year (roughly 220 to 240 billable days). Factoring in 25 to 30 days for annual leave, public holidays, sick days, and gaps between contracts provides a realistic picture of annual revenue.
Worked example: 400 day rate calculation
Consider a contractor charging £400 per day working a typical 5-day week (37.5 hours per week across 7.5-hour working days) across a 46-week working year (230 working days).
Weekly billing equals £2,000.00 (£400 multiplied by 5 days). Across 46 billable weeks, gross annual contract earnings equal £92,000.00.
This equates to an average gross monthly income of £7,666.67 (£92,000 divided by 12 months). On an hourly basis, a £400 day rate for a 7.5-hour day equals £53.33 per hour.
Why contractors should not multiply by 52 weeks
A common mistake when moving from permanent employment to contracting is multiplying your day rate by 260 working days (52 weeks multiplied by 5 days). This would produce an unrealistically high figure because it assumes zero days off throughout the entire calendar year.
Contractors must fund their own holidays, sick leave, training days, and unpaid time between assignments. Using 44 to 46 weeks gives a prudent baseline for budgeting and tax planning.
Inputs for the Day rate calculator
Day rate
The agreed gross fee charged or earned for one full working day before tax and business expenses.
Days per week
The number of days worked in a typical week, usually 5 days for full-time contracts.
Hours per day
The standard length of your working day, typically 7.5 or 8 hours, used to determine your equivalent hourly rate.
Working weeks per year
The number of paid billable weeks you anticipate working in the year, commonly 44 to 48 weeks allowing for time off.
CALCULATOR QUESTIONS
Day rate calculator questions
How many working days should I calculate for a contractor year?
Most contractors use between 220 and 230 billable days per year (44 to 46 weeks at 5 days per week). This allows for 25 to 30 days of holidays, bank holidays, and potential gaps between contracts.
How do I convert a permanent salary to an equivalent day rate?
A common rule of thumb is to take your target permanent salary, add 20% to 30% to cover benefits, pension, and unbilled time, then divide by 225 or 230 working days.
Is day rate income subject to VAT?
If you trade through a limited company or sole proprietorship that is VAT registered (mandatory in the UK once turnover exceeds £90,000), you must add VAT (typically 20%) to your day rate on client invoices.
What is the difference between day rate and hourly rate contracts?
A day rate pays a flat fee for a completed day regardless of minor daily fluctuations in hours, whereas an hourly rate compensates you for exact recorded hours, which is advantageous when regular overtime is required.