All Tools

YenWise is a free suite of bilingual financial calculators built specifically for expats living in Japan. Every tool runs entirely in your browser, uses formulas verified against official Japanese government sources, and is updated for the 2026 (Reiwa 7) tax reform.

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Currency Exchange Rate Calculator

Currency

Convert between currencies at live rates

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Japan Income Tax Calculator

Tax

Calculate Japanese income and residence tax

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NISA Calculator

Investment

Project tax-free investment returns

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Pension Lump-Sum Calculator (脱退一時金)

Pension

Estimate your pension refund

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Rent vs Buy Calculator

Real Estate

Compare housing costs in Japan

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Furusato Nozei Calculator (ふるさと納税)

Tax

Calculate your hometown tax donation limit

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iDeCo Tax Savings Calculator (個人型確定拠出年金)

Pension

See how much tax you save with iDeCo

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Japan PR New Criteria Calculator

Visa / PR

Estimate income & pension gates under the 2026 PR draft rules

Whether you are trying to decode a confusing payslip, estimate your income tax after deductions, compare the new NISA versus iDeCo, or figure out whether to rent or buy in Tokyo, these calculators turn opaque Japanese finance rules into clear numbers you can act on. Each tool comes with a plain-English (and plain-Japanese) explanation of the underlying rules.

All tools are free, require no signup, and store nothing on our servers. Tax tables and social insurance rates are cross-checked against the National Tax Agency (NTA), Japan Pension Service, and Ministry of Health, Labour and Welfare, and updated whenever the rules change.

How to Use These Tools

Pick the calculator that matches the question in front of you. If you are unsure which to start with, the Income Tax Calculator is the most broadly useful — it covers employment income, deductions, and the 2026 reform changes in one place.

  1. Choose the tool that matches your situation. Each tool page opens with a short explanation of what it does and does not cover.
  2. Enter your numbers. Results calculate instantly in your browser — there is no submit button, no waiting, and no data leaves your device.
  3. Read the breakdown section. Every tool shows how the final number was reached, line by line, so you can sanity-check each component.
  4. Check the FAQ at the bottom of each tool page for edge cases, common mistakes, and links to the official source.

Frequently Asked Questions

Are these calculators free to use?
Yes. Every YenWise calculator is 100% free, with no account, no email, and no hidden paywall. The project is funded by display advertising, not by charging users.
How accurate are the calculations?
Every formula is verified against official Japanese sources — primarily the National Tax Agency (NTA), Japan Pension Service, and Ministry of Health, Labour and Welfare. Tax brackets, social insurance rates, and the 2026 (Reiwa 7) reform changes are all reflected. That said, your actual tax bill may differ based on specific deductions and circumstances; always cross-check with your final tax notice.
Do you store my data?
No. All calculations happen entirely in your browser. Nothing you type — salary figures, investment amounts, personal details — is ever sent to our servers or stored anywhere. You can safely close the page and nothing persists.
Can I use these tools if I don't speak Japanese?
Yes. Every tool is available in English and Japanese, plus six other languages (Chinese, Vietnamese, Indonesian, Portuguese, Tagalog, and Bengali). All explanations, FAQs, and breakdowns are translated — not just the buttons.
How often are the tax rates updated?
We monitor NTA, Ministry of Finance, and Ministry of Health, Labour and Welfare publications year-round and publish updates within days of any rule change. The 2026 tax reform — the largest restructuring of Japanese income tax in over a decade — was reflected in the calculators within days of being passed.