Some of our staff are contracted to work 3 days on and 3 days off. They work 10 hours per shift. They are all salaried and we pay them 1/12 of their salary each month regardless of whether it is a 4 or 5 week month.

How would I work out the total hours they work each year in order to work out their hourly rate?

I am having problems because each year and week they can work a differing number of hours. Should the calculation be based on an average number of hours (measured over a set period)?

For example if someone is paid £20k per annum, what should their hourly rate be?

Many thanks

Zoe