Guidance & standards
The annual figure is gross turnover, not take-home pay. Tax, National Insurance, materials, van, tools, insurance and pension all come out of it, and so does every hour you spend quoting and invoicing rather than earning. As a rough guide, your take-home will be a good deal less than the headline number — treat the turnover figure as the top of the funnel, not your salary.
The weeks-per-year figure is where day rates flatter. There are 52 weeks in a year, but nobody bills all of them: holidays, bank holidays, illness, training and quiet periods knock a chunk off. Using 46 weeks or fewer gives a far more honest annual figure than assuming 52.
Use the tool both ways. When someone offers a day rate, convert it to an hourly figure to compare it against your own; when you set your own price, start from the annual turnover you need and work back to the day rate that delivers it.
Gives gross turnover before tax, National Insurance, materials and business costs — not take-home pay.