Overtime pay is calculated by multiplying the regular hourly rate by an overtime multiplier, then multiplying that by the number of overtime hours worked. In the US, the Fair Labor Standards Act sets a minimum overtime rate of 1.5× (time-and-a-half) for hours over 40 per week, though employers may offer higher rates. In the UK there is no statutory overtime rate — employers set their own, which is why the custom multiplier option exists.