How to Use the Overtime & Night/Holiday Premium Pay Calculator
Korea's night and holiday work pay is a legally mandated premium under labor law, but U.S. federal law works differently, so this calculator separates the two kinds of extra pay American workers can encounter. Under the Fair Labor Standards Act (FLSA), only overtime pay — 1.5x your regular rate for hours worked beyond 40 in a workweek — is a federal legal requirement for non-exempt employees. Extra pay for working nights or holidays is not federally mandated; it exists only where an employer's policy or a union contract provides it.
This calculator keeps that distinction visible. Enter your hourly rate and total hours worked to calculate your mandatory FLSA overtime premium (the extra half-time on hours past 40). Then enter how many of your hours fell on a night shift or a holiday, and select your employer's premium multiplier for those hours, to see that separate, policy-based premium on top.
Because night and holiday premiums vary entirely by employer, always confirm your specific company policy or union contract for the actual multiplier that applies to you — some employers offer none at all, while others (especially in healthcare, manufacturing, and hospitality) offer meaningful shift differentials. This calculator uses simplified weekly totals and does not account for state-specific daily overtime rules, which exist in a few states like California.
Frequently Asked Questions
No. Under the FLSA, only overtime pay (1.5x for hours worked beyond 40 in a week) is federally mandatory. Extra pay for night shifts or working on a holiday is a company policy or union contract benefit, not a federal legal requirement, though some states or employers do offer it.
FLSA overtime is based purely on total hours worked past 40 in a workweek, regardless of what time of day those hours fall. Night or holiday premiums, if your employer offers them, are calculated separately and added on top of the base pay and any overtime premium.