Free Working Hours per Month calculator with clear step-by-step results.
Contracted monthly hours come from the weekly figure times 52.14 divided by twelve, which is why a 37.5 hour week averages about 163 hours a month rather than 150. Deducting paid leave and public holidays gives hours actually worked - the correct denominator for an effective hourly rate.
Contracted monthly hours
Monthly = weekly hours x 52.1429 / 12
Effective hourly rate
Rate = annual salary / (annual hours - (leave + holidays) x hours per day)
A year is 365.25 days, or 52.1429 weeks. Using 52 understates annual hours by about 0.3%, which matters when converting salary to an hourly rate.
Hours actually worked. Comparing a salary against contracted hours ignores that paid leave and holidays are part of the package a contractor does not receive.