Work Hours Calculator

Calculate daily, weekly, monthly, and annual work hours. Estimate pay based on your hourly rate, including overtime.

This calculator turns a start time, an end time, and a lunch break into a full pay picture. It first converts the start and end clock times to minutes past midnight and subtracts one from the other (line 12); if the result comes out negative -- an end time earlier than the start time, entered for an overnight shift -- it adds a full 24 hours before continuing (line 13), then removes the lunch break in minutes (line 14). That single daily-minutes figure, divided by 60, becomes Daily Hours, and every other hours figure is a fixed multiple of it: Weekly Hours multiplies by the days-per-week you entered, Monthly Hours multiplies the weekly figure by 4.33 (the average number of weeks in a month), and Yearly Hours multiplies it by 52 (lines 16-19). The four pay figures each multiply their matching hours figure by your hourly rate (lines 21-24) -- there is no discount or premium applied anywhere in this chain. End Time has by far the largest effect on Daily Hours of the seven inputs, since it sets the upper bound of the shift directly; Start Time moves it almost as much in the opposite direction, and Days per Week and Hourly Rate have no effect on Daily Hours at all, since neither term appears in that calculation. The calculator also reports Overtime (Daily) and Overtime (Weekly) as the hours worked beyond 8 a day or 40 a week (lines 27-28), but these two figures are informational only: they are not subtracted from or multiplied into any of the pay figures above them, so entering a schedule that clears 8 hours a day will not raise your Daily Pay above the flat hours-times-rate result.