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keisanHigh-precision calculations for everyday life and work

Upper Limit on Overtime and Holiday Work Hours

Author: sampomichExecutions: 8

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This tool calculates the monthly maximum number of hours for overtime and holiday work (Labor Standards Act, Article 36, Paragraph 6, Items 2 and 3).
Regarding one of the checkboxes in the Article 36 Agreement—“Less than 100 hours per month, and an average of
80 hours or less over multiple months”—by entering the actual overtime and holiday work hours for the past five months,
you can calculate this month’s maximum hours in advance.If you wait until the end of the month to calculate this
and find that the average exceeds the limit—resulting in a violation of the law and an investigation by law enforcement—it’s already too late;
therefore, you should calculate the maximum allowable hours for the current month at the beginning of the month to ensure compliance and check the box in advance.
Last Month
Time
Minutes(Monthly statutory holiday working hours + overtime hours)
Two months ago
Time
Minutes
3 months agoTime
Minutes
4 months ago
Time
Minutes
5 months agoTime
Minutes
This Month's Limit Time Minutes(The lowest of the following calculated values)
Remaining time, averaging 80 hours or less per month Time Minutes
The same—3 months Time Minutes  The same—4 months Time Minutes
The same—5 months Time Minutes  The same—6 months Time Minutes
The default values are based on the figures in the boxed article in the middle of page 18 of the pamphlet.
https://www.mhlw.go.jp/content/001140962.pdf

This is calculated by working backward from the average.Let X represent this month only. The total overtime and holiday work hours
from the past 1 to 5 months ÷ number of months = average hours (80 hours or less)
Total work hours for each month (excluding this month) + X = average hours × number of months
X = average hours × number of months – total work hours for each month

This month’s upper limit = 80 × number of months (2–6) – cumulative hours over the past 1–5 months

The lowest value among the calculated hours is adopted. However, if the lowest value is 100 hours or more,
Item 2 of the same paragraph of the same article applies, resulting in 99 hours and 59 minutes.

If other upper limits—such as monthly, annual, or frequency limits—specified in the Article 36 Agreement
are likely to be reached first, those limits shall apply.

The calculated values have not been verified beyond the sources cited. As no guarantee is provided,
please use this information for reference only.

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