Overtime Pay & Work Hours Calculator (Korea 2026 and US 40-Hour Rule)

This calculator turns your clock-in and clock-out times into actual work hours and an estimate of overtime pay.

In Korea, under the Labor Standards Act, a workplace with five or more regular employees must add 50% to the hourly wage for time beyond 8 hours a day or 40 hours a week (overtime) and for work between 22:00 and 06:00 (night work).

Holiday work earns 50% extra for the first 8 hours and 100% extra beyond 8 hours, and night hours add another 50% on top.

Workplaces with fewer than five employees do not owe these premiums, so the tool lets you switch between the two cases.

For example, at the 2026 minimum wage of 10,320 KRW an hour, a 09:00 to 20:00 shift with a 60-minute break is 10 hours of work: base pay is 103,200 KRW, the 2 overtime hours add 10,320 KRW, so one day is 113,520 KRW and five days are 567,600 KRW a week, or about 2,466,000 KRW a month using 4.345 weeks.

A shift from 18:00 to 03:00 with a 60-minute break is 8 hours including 5 night hours, which adds 25,800 KRW.

For readers in the United States, the federal Fair Labor Standards Act pays non-exempt employees at least 1.5 times their regular rate for hours beyond 40 in a workweek; there is no federal premium for nights or holidays, though some states such as California add daily overtime.

Pick the rule set that matches you.

The calculator assumes the unpaid break comes out of daytime hours first, and it does not model fixed monthly salaries, flat-rate overtime contracts, flexible hours, weekly holiday pay or the shorter hours that apply to workers under 18.

The results are estimates for reference only and do not replace advice from a labor or tax professional, so confirm your real pay with your employer, your contract or the labor authority.