Guides JP

Overtime Pay Calculator

Calculate your hourly rate from a monthly salary or hourly wage and scheduled working hours, then compute overtime pay for regular overtime, late-night, holiday, and over-60-hours work using premium rates. All processing runs in your browser and no data is sent to any server.

Last updated: 2026/10/16 Finance Feedback & bug reports
JPY
hrs/mo
Hourly Rate (wage per hour) 0JPY/hr

Enter Overtime Hours

Regular Overtime Work beyond statutory hours (usually 25%+)
Hours
hrs
Premium
%
Amount 0
Late-Night Work Work between 22:00-05:00 (extra 25%+)
Hours
hrs
Premium
%
Amount 0
Holiday Work Work on statutory holidays (35%+)
Hours
hrs
Premium
%
Amount 0
Overtime Over 60h/mo Overtime exceeding 60 hours/month (50%+)
Hours
hrs
Premium
%
Amount 0
Total Overtime Pay
0 JPY

Breakdown

Category Hours Premium Amount
Important Notes

The results of this tool are estimates for general informational purposes only and do not constitute legal or labor advice.

Actual premium rates and the method for calculating the hourly rate (including which allowances count toward base pay) vary by your employer's work rules, wage regulations, and labor agreements. Always check your workplace rules.

Late-night work can overlap with overtime or holiday work, in which case premium rates are combined. This tool is a simplified version that calculates each category independently.

For accurate overtime pay or unpaid wage claims, please consult a labor and social security attorney or a lawyer.

How to Use

1

Enter basis and wage

Choose "From Monthly" or "From Hourly", then enter your monthly salary and scheduled hours, or your hourly wage. The hourly rate is calculated automatically.

2

Enter overtime hours

Enter hours for regular overtime, late-night, holiday, and over-60h work. Default statutory premium rates are preset and can be adjusted.

3

Review overtime pay

The total overtime pay and a per-category breakdown appear instantly. Copy the result with one click.

About the Overtime Pay Calculator

A tool that derives an hourly rate from a monthly salary or hourly wage and calculates premium pay for each type of overtime: regular overtime, late-night, holiday, and work exceeding 60 hours per month. Premium rates are adjustable so you can estimate based on your own work rules. All calculations run entirely in your browser, and your wage data is never sent to a server.

Features

  • Automatic Hourly RateInstantly derive the hourly rate from monthly salary and scheduled hours. Hourly input also supported.
  • 4 Premium TypesOvertime 25%, night 25%, holiday 35%, and over-60h 50% calculated separately.
  • Adjustable PremiumsSet premium rates freely to match your company's rules.
  • Privacy ProtectedAll processing happens in your browser. Wage data is never transmitted.

Use Cases

  • Estimate your expected overtime pay for the month
  • Check whether the overtime on your payslip looks about right
  • Break down overtime including night and holiday work
  • Check overtime pay for hourly part-time work
  • Estimate hourly-rate-based income for a new job or side work

FAQ

How is the hourly rate calculated?
For monthly salaries, it is generally "monthly salary divided by average scheduled monthly hours." This tool divides your monthly salary by the scheduled hours you enter. For hourly wages, the hourly wage is the hourly rate.
What do the 25%, 35%, and 50% premiums mean?
They are reference premium rates under Japan's Labor Standards Act: statutory overtime is 25%+, late-night work (22:00-05:00) adds 25%+, statutory holiday work is 35%+, and overtime beyond 60 hours/month is 50%+. Actual rates may differ by work rules.
How do I enter late-night overtime?
Enter the hours worked during the late-night period (22:00-05:00) under "Late-Night Work." In reality, late-night overtime stacks premiums (25% overtime + 25% night), but this tool calculates each category independently. Check your work rules for the exact amount.
Will the result match my payslip?
This tool provides estimates. Actual overtime pay depends on which allowances count toward base pay, rounding rules, and any fixed/deemed overtime. Use it as a guide only.
Is my wage data saved or transmitted?
No. All calculations run entirely in your browser, and the monthly salary, hourly wage, and other data you enter are never sent to or stored on any server. You can use it with peace of mind.

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Related Guides

How to Calculate Overtime Pay: Hourly Rate, Premium Rates, and Fixed Overtime Learn how overtime pay is calculated from the ground up: how to find the hourly rate (base wage divided by average monthly scheduled hours), the premium rates of 25% for overtime, 25% for late-night, and 35% for holiday work, how fixed (deemed) overtime works, the over-60-hours premium, and worked examples.