Free Japanese Tax & Finance Calculators
For foreign residents in Japan and anyone needing to calculate Japanese income tax, pension, residence tax, mortgage, NHI, and 1,000+ other daily-life numbers. All free, no signup, in your browser only.
Top 20 calculators for residents in Japan
The Japanese-language form is the source of truth for now; an English UI is in progress. The link below opens the Japanese page — most fields use international numbers and the result is universal.
Japanese Income Tax Calculator
Free calculator for Japan income tax — works for residents, foreign workers, and freelancers. 2026 tax-year rates, including 復興特別所得税 (reconstruction surtax).
Open taxJapanese Residence Tax Calculator
Free calculator for Japan residence tax. Approx 10% flat on taxable income, billed by your municipality from June.
Open taxJapan Take-Home Pay Calculator
See your real Japanese take-home salary after income tax, residence tax, health insurance, pension, and employment insurance.
Open insuranceNHI (国民健康保険) Calculator
Japanese NHI premium calculator. Required if you're self-employed, freelancing, or unemployed. Varies by city.
Open pensionNational Pension (国民年金) Calculator
Calculate your monthly Kokumin Nenkin contribution and estimated pension at age 65.
Open mortgageJapan Mortgage Monthly Payment
Japanese mortgage calculator: monthly payment, total interest, and principal breakdown for housing loans in Japan.
Open taxFurusato Nozei (Hometown Tax) Limit
Furusato Nozei donation cap calculator. Donate to Japanese cities, get gifts, and reduce your taxes — only ¥2,000 net cost.
Open investmentiDeCo Tax Saving Calculator
iDeCo Japan calculator: annual tax savings on contributions. Foreigners with permanent residence eligible.
Open investmentNew NISA Simulation (2024+)
New NISA (2024+) tax-free investment simulator. Up to ¥18 million lifetime, no tax on gains or dividends.
Open taxJapanese Inheritance Tax (相続税)
Japanese inheritance tax calculator. Basic deduction = ¥30M + ¥6M × heirs. Spouse exemption up to ¥160M.
Open taxGift Tax (贈与税) Calculator
Japanese gift tax (Zōyozei) calculator. Annual ¥1.1M exemption, with progressive rates above.
Open pensionPension Estimator (Kokumin + Kosei)
Calculate your Japanese pension at retirement: kokumin nenkin + kosei nenkin combined.
Open taxRetirement Allowance Tax
Japanese retirement allowance (taishokukin) tax calculator. Generous deduction for years of service.
Open taxConsumption Tax (消費税)
Japanese consumption tax calculator. 10% standard, 8% on food/beverages (eat-out 10%).
Open taxProperty Tax (固定資産税)
Japanese property tax calculator (Kotei Shisanzei + Toshi Keikaku Zei). Annual tax for property owners.
Open taxReal Estate Acquisition Tax
Japan property purchase tax calculator. 3% (residential) or 4% (non-residential) of assessed value.
Open taxCrypto Tax (仮想通貨)
Japan cryptocurrency tax calculator. Treated as miscellaneous income — combined with salary, up to 55% top rate.
Open taxFreelance Rate Calculator
Japan freelance rate calculator. Reverse-engineer required revenue from target income, accounting for tax + NHI + pension.
Open healthBMI Calculator
Quick BMI calculator with WHO and Japanese categories.
Open healthDaily Calorie Needs
Calculate daily calorie requirements using Mifflin-St Jeor formula. Includes weight loss/gain targets.
Open healthPregnancy Due Date
Japanese-style pregnancy due date calculator. Based on standard 280-day gestation.
Open lifeAffordable Rent in Japan
How much rent can you afford in Japan? Conservative / standard / max guideline based on monthly take-home.
Open lifeMoving Cost in Japan
Japan moving cost calculator. Estimate by belongings volume + distance + season.
Open lifeAge Calculator (Japanese-style)
Age calculator showing years/months/days, days since birth, and days until next birthday. Includes Eto (Chinese zodiac).
Open lifeDays Between Two Dates
Calculate the precise difference between two dates in days, weeks, months, and approximate years.
Open mortgageJapanese Mortgage Loan Comparison Calculator
Compare 2 Japanese mortgage offers: monthly payment, total interest, lifetime cost. Supports 元利均等返済 (equal-payment) repayment.
Open taxJapanese Overtime Pay Calculator
Free calculator for Japanese overtime pay: 25% weekday, 50% over 60h/month, 25% late-night (22:00–05:00), 35% holiday — based on the Labor Standards Act.
Open unitTsubo ↔ Square Meter Converter (Japanese Floor Area)
Convert 坪 (tsubo) to m² or m² to tsubo. 1 tsubo = 3.3058 m² ≈ 2 tatami mats. Used for Japanese apartments, houses, and land listings.
OpenLooking for a specific calculator that isn't listed? Browse all 1,000+ tools or use the search box at the top right.
Why Keisan Tools?
- No signup, no loginEverything runs in your browser. Favorites and history are stored locally — never on a server.
- 2026 tax-year compliantUpdated for the latest NTA brackets, NHI rates, and pension contribution amounts.
- Designed for residents in JapanMost online calculators in English are US/UK biased. Ours follows Japanese rules end-to-end.
- Mobile-first designOptimized for any device — phone, tablet, or desktop. Voice input available on supported tools.
⚠️ Disclaimer: These calculators are estimates. For actual tax filing, please consult a licensed 税理士 (zeirishi) or FP (financial planner). Results are not a substitute for professional advice.