Time Card Calculator

A time card converts clock readings into payable hours in three steps: elapsed time per day, minus unpaid break, summed across a fixed workweek, then split at the overtime threshold. The overnight case is the one that trips manual arithmetic, since a shift clocking in at 22:00 and out at 06:00 yields a negative difference until 24 hours are added back. Under the US Fair Labor Standards Act, covered non-exempt employees must be paid at least 1.5 times the regular rate for hours over 40 in a workweek, where the workweek is a fixed and regularly recurring period of 168 hours that the employer designates. Hours cannot be averaged across two weeks to avoid the premium. Break treatment follows a bright line in the regulations: rest periods of about 5 to 20 minutes are compensable work time under 29 CFR 785.18, while bona fide meal periods of 30 minutes or more are unpaid only if the employee is completely relieved of duty under 29 CFR 785.19. State law can be stricter than the federal floor. California requires daily overtime after 8 hours, double time after 12 hours in a day, and premium pay on the seventh consecutive day. The main limitations of a weekly-threshold model like this one are that it ignores daily overtime rules, treats the regular rate as the base hourly wage even though non-discretionary bonuses and shift differentials must legally be folded into it, and assumes the employee is non-exempt in the first place.

The 40-hour threshold this calculator pivots on is a specific legislative artifact. The Fair Labor Standards Act was signed by Franklin D. Roosevelt on 25 June 1938, and it did not start at 40 hours: the workweek trigger was set at 44 hours in the first year, 42 in the second, and 40 from 1940 onward. The overtime premium was designed with two purposes at once, compensating employees for long hours and making long hours expensive enough that employers would spread available work across more workers during the Depression. The Portal-to-Portal Act of 1947 later narrowed which preliminary and postliminary activities count as hours worked, and the 1961 and 1966 amendments extended coverage to large parts of retail, restaurant, and service employment. The measurement side has an equally concrete history. Willard Bundy, a jeweler in Auburn, New York, patented a mechanical time recorder in 1888 that stamped an employee number and the time onto a paper tape, and the company built around it merged into the firm that became Computing-Tabulating-Recording and then IBM in 1924. Punch clocks made per-minute records of arrival and departure routine, which in turn made statutory hour thresholds enforceable. Paper cards gave way to badge readers and software timesheets, but the underlying record is still a set of paired in and out stamps.