Popular calculations
Start with the questions people most often ask about work and money in Japan.
Popular journeys
Follow a short path when one calculation is only part of the decision.
From gross salary to take-home pay
Estimate pay, payroll deductions, resident tax, and the amount that reaches your bank account.
Renting your first apartment
Plan initial fees, monthly rent, guarantor costs, insurance, utilities, and moving cash.
Starting life in Japan
Sequence your residence card, address, My Number, bank, SIM, insurance, and first-month budget.
Leaving Japan
Check resident tax, pension refund, insurance closeout, tax representative, and departure timing.
Most useful Japan calculators
A focused starting set, chosen around recurring search demand and common resident decisions.
Japan salary calculator
Estimate take-home pay and payroll deductions.
Japan income tax calculator
Build a simple national income-tax estimate.
Resident tax calculator
Plan juminzei timing, first-year effects, and the June bill.
Japan pension calculator
Estimate basic and employees' pension portions.
Overtime pay calculator
Apply ordinary, late-night, holiday, and over-60-hour premiums.
Rent affordability calculator
Compare monthly rent with income and household costs.
Mortgage calculator
Estimate monthly payments for a Japan home loan.
Cost of living calculator
Total housing, food, utilities, transport, and flexible spending.
Health insurance calculator
Plan employee or national health-insurance costs.
Furusato nozei limit
Estimate a planning range for hometown-tax donations.
HSP and PR points
Check Highly Skilled Professional point signals and documentation.
First 14 days in Japan
Plan arrival tasks and the cash needed to get established.
Everyday calculations
Simple, source-linked tools for daily planning anywhere, including life in Japan.
Days between dates
Count elapsed or inclusive calendar days without timezone shifts.
Age calculator
Find completed age on any date and days until the next birthday.
Percentage calculator
Calculate percent of, ratio percentage, or percentage change.
Adult BMI calculator
Estimate adult BMI as a screening reference, not a diagnosis.
Adult calorie needs
Estimate weight-maintenance energy needs using the 2023 DRI adult equations.
Consumption tax
Add or extract Japan's 10% or reduced 8% consumption tax.
Commuter-pass break-even
Compare a quoted commuter pass with the cost of regular tickets.
JST time converter
Convert Japan time to a world time zone for the selected date.
Japan business days
Exclude weekends and official 2026–2027 national holidays.
School age and grade
Check the standard April 2–April 1 Japanese school cohort.
Japanese era converter
Convert Gregorian years to Reiwa, Heisei, Showa, Taisho, and Meiji.
Japanese zodiac calculator
Find the traditional eto animal associated with a birth year.
Source-linked and date-aware
Rule-based pages show their review date and link to the relevant Japanese authority. Always confirm the official result before a tax, payroll, pension, insurance, benefit, or immigration decision.
Choose your language
Language versions use separate URLs and visible language controls so you stay in control.
Before you rely on a result
Are these Japan calculators official?
No. They are free planning estimates. Regulated topics include official links and review dates so you can confirm current rules and your individual result.
Which languages are available?
The hub has dedicated English, Japanese, Korean, Vietnamese, and Simplified Chinese sections, each on its own crawlable URL.