Contractor Day Rate Calculator

A day rate calculator works backwards from the income you want to take out of your business to the rate you need to charge for each billable day. It exists because the arithmetic that feels obvious, dividing a salary by 260 working days, ignores holidays, sickness, admin days, business costs and the tax you will owe. The result is a rate that looks competitive and quietly loses money.

• Your target income and your annual business overheads are added together to give the revenue your billing has to produce.
• A percentage buffer is applied on top for tax and downtime, because not every working day is a paid day and not every pound invoiced is yours to keep.
• That total is divided by the number of days you realistically expect to bill in a year to give the day rate.
• The hourly figure is the day rate spread over a 7.5-hour billable day.

1. Enter the annual income you want the business to support.
2. Enter the number of days you expect to actually bill, not the number of days in the working year. Many independent contractors bill between 200 and 230.
3. Add your yearly overheads: insurance, accountancy, software, equipment, travel, training and professional fees.
4. Set a buffer percentage for tax and downtime, then read the suggested day and hourly rates.

A self-employed health and safety consultant wants 60,000 a year, expects to bill 220 days, carries 6,000 of overheads and applies a 25% buffer.

• Income plus overheads: 60,000 + 6,000 = 66,000.
• Buffer for tax and downtime: 66,000 x 1.25 = 82,500 of revenue needed.
• Day rate: 82,500 / 220 = 375.
• Hourly rate at 7.5 hours: 375 / 7.5 = 50.

A day rate of 375 supports the target income once overheads, tax and unbilled days are accounted for. At 300 a day the same consultant would fall roughly 16,500 short.

Treat the output as a floor rather than a price list. If the number looks high for your market, the honest response is usually to revisit the assumptions: more billable days, lower overheads, or a smaller income target. Dropping the rate without changing anything else simply moves the shortfall onto you. It is also worth running the calculation twice, once for a busy year and once for a quiet one, so you know how much slack you have.

Public sector frameworks and consultancy call-offs are frequently priced on day rates, and once a rate is submitted on a rate card it can be locked in for the length of the agreement. Knowing your true break-even rate before you fill in a pricing schedule is what stops a two-year contract becoming two years of underpaid work.

How many billable days should I assume?

Start from 260 working days, then deduct holiday, bank holidays, sickness, business development and admin. Many contractors land between 200 and 230.

Does the calculator account for tax?

Indirectly, through the buffer percentage. It is a planning figure rather than a tax computation, so speak to an accountant about your actual liability.

Should my day rate include expenses?

Only if the contract does not reimburse them separately. Check the pricing schedule, because some buyers pay travel and subsistence on top and others expect it inside the rate.

How do I convert a day rate to an hourly rate?

Divide by the number of billable hours in your day. This tool uses 7.5 hours, which is a common UK assumption once breaks are excluded.