Japan has some unique financial calculations — furusato nozei limits, take-home pay after shakai hoken, housing loan simulations with Japanese rates, and consumption tax with the reduced 8% rate.
I built 8 free Japanese finance calculators that run entirely in your browser. Everything is in Japanese, no signup needed, and nothing leaves your device.
1. Tedori Keisan (Take-Home Pay Calculator)
Enter your monthly gross salary and get your take-home after shakai hoken (social insurance), income tax, and resident tax. Supports age 40+ kaigo hoken (nursing care insurance) and dependent deductions.
Try it: 手取り計算ツール
2. Nenshu Tedori (Annual Income to Take-Home)
Similar but starts from annual income (nenshu). Shows yearly and monthly take-home — useful for job offers where salary is quoted annually.
Try it: 年収から手取りを計算
3. Furusato Nozei Calculator
Enter your annual income and family structure to calculate your maximum furusato nozei deduction limit (the amount you can donate with only ¥2,000 out-of-pocket). One of the best tax benefits in Japan that many people underuse.
Try it: ふるさと納税 控除上限額シミュレーション
4. Housing Loan Simulator (Juutaku Loan)
Enter borrowing amount, interest rate, and repayment period to see monthly payments, total repayment, and total interest. Uses the standard equal principal and interest method (元利均等返済).
Try it: 住宅ローン返済シミュレーション
5. Electricity Cost Calculator (Denki Dai)
Enter your appliance wattage and usage hours — see daily, monthly, and yearly electricity costs. Helpful for understanding which appliances are costing you the most.
Try it: 家電の電気代を計算
6. Freelance Hourly Rate Calculator
For freelancers in Japan: enter your fixed monthly costs, target income, working hours, and tax rate to calculate the minimum hourly rate you should charge.
Try it: フリーランス最低時給計算
7. Consumption Tax Calculator (Shouhizei)
Instant tax-included/tax-excluded price conversion. Supports both the standard 10% rate and the reduced 8% rate for food and beverages.
Try it: 消費税計算
8. Commuting Cost Calculator (Tsuukin Hi)
Calculate monthly and annual commuting costs by transport type (train, bus, car, bicycle). Compares against the ¥150,000/month tax-free commuting allowance limit.
Try it: 通勤費を計算
All tools are free, private, and mobile-friendly. Built for people living and working in Japan who want quick calculations without downloading an app or creating an account.
If you're an expat in Japan or just dealing with Japanese finances, these should save you some time. Feedback welcome!
Originally published at https://tool.teamzlab.com
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