Enter your monthly salary, scheduled working hours, and overtime/late-night/holiday hours to instantly estimate your overtime pay under Japanese labor law.
Japan Overtime Pay Calculator
Calculates overtime, late-night, and holiday work premiums separately, then adds them up
* This calculator applies only the base statutory premiums (25% overtime, 50% on overtime beyond 60 hours a month, 25% late-night, 35% holiday) under Japan’s Labor Standards Act. It does not account for fixed/”deemed” overtime pay (minashi zangyodai) arrangements in your employment contract.
Confirm the exact figure against your payslip and employment rules, or consult a labor and social security attorney (shakai hoken roumushi).
How to Use This Calculator
- Enter your monthly base salary and monthly scheduled working hours — your hourly rate is calculated automatically. You can find scheduled hours on your payslip or employment rules (shugyo kisoku).
- Enter overtime hours worked beyond the statutory limit (8 hours/day, 40 hours/week), late-night hours worked between 10pm and 5am, and statutory holiday hours worked on your legally mandated day off (at least one day per week).
- If overtime hours overlap with the late-night window, enter that time in both the overtime and late-night fields — the calculator adds both premiums for that overlapping time, matching how Japanese payroll actually stacks them.
- Click Calculate to see your hourly rate, each premium category, and the total, all appear in sequence.
How the Calculation Works
Japan’s Labor Standards Act sets different premium rates depending on the type of work. This calculator uses the following base formulas.
Hourly rate = Monthly base salary ÷ Monthly scheduled hours
Overtime pay = Hourly rate × 1.25 × overtime hours
Late-night pay = Hourly rate × 0.25 × late-night hours
Holiday pay = Hourly rate × 1.35 × holiday hours
The key detail is that late-night pay is not a standalone premium — it stacks on top of other premiums. If a shift is both overtime and late-night (after 10pm), the 25% overtime premium and 25% late-night premium apply together, effectively paying 1.5x your hourly rate for that time. This calculator reflects that by treating overtime and late-night hours as separate line items and adding both together, rather than picking just one.
Since April 2023, all companies — including small and mid-size businesses — must pay a 50% premium (up from 25%) on overtime hours beyond 60 hours in a single month. This calculator applies that tier: 25% on the first 60 hours of overtime and 50% on anything beyond. Fixed/deemed overtime arrangements and variable working-hour systems can still make your payslip differ.
For more on fixed/”deemed” overtime pay pitfalls and what to do if your overtime pay isn’t showing up correctly, see our full guide:
How Japanese Overtime Pay Works: A Guide for Foreign Employees →
Frequently Asked Questions
Q. If overtime hours also fall in the late-night window, what’s the premium?
A. The 25% overtime premium and 25% late-night premium stack, so you’re paid 1.5x your hourly rate for that overlapping time. In this calculator, enter the same hours in both the overtime and late-night fields to see both premiums calculated and added together.
Q. Is the premium different for overtime beyond 60 hours a month?
A. Yes. Since April 2023, all employers in Japan — including small and mid-size companies — must pay a 50% premium on the portion of monthly overtime beyond 60 hours. This calculator applies it: with 100 hours of overtime, the first 60 are paid at 25% and the remaining 40 at 50%.
Q. Can I still use this if my contract has fixed/”deemed” overtime pay (minashi zangyodai)?
A. Fixed overtime pay bundles a set number of overtime hours into your base salary or a fixed allowance in advance. If your actual overtime exceeds that fixed number of hours, only the excess needs to be calculated as additional pay — check your contract’s fixed hours first, then enter just the excess into this calculator.
Q. When does the holiday pay premium apply?
A. The 35% premium applies to work on your statutory day off under the Labor Standards Act (at least one day per week, or four days per four weeks). Working on a non-statutory scheduled day off may count as overtime pay instead of holiday pay — check your company’s employment rules to confirm which applies.
Key Takeaways
- Hourly rate = monthly base salary ÷ monthly scheduled hours is the foundation for every other calculation.
- Overtime (25%), late-night (25%), and holiday (35%) premiums are all different, and overtime + late-night hours stack when they overlap.
- Since April 2023, overtime beyond 60 hours/month gets a 50% premium at every company size, and this calculator reflects it.
- If you have a fixed/deemed overtime pay arrangement, only hours beyond your contracted fixed amount need this calculation.
Primary sources
This article and calculator are for general informational purposes only. Actual entitlement and amounts depend on your employment contract, company work rules, and individual circumstances. Confirm specifics with a labor and social security attorney (shakai hoken roumushi) or your local Labor Standards Inspection Office.