Currency Exchange Rate Calculator

About This Currency Converter

This currency converter uses live exchange rates from the European Central Bank (ECB), updated every business day. It supports 30 major currencies and performs instant conversions with precise decimal handling for each currency.

Enter any amount, select your source and target currencies, and see the result instantly. Rates are refreshed hourly via our server, ensuring you always get the latest available ECB reference rate.

Exchange rates move continuously during global trading hours, but the ECB publishes a single official reference rate per business day, which is the standard used by central banks, accountants, and tax authorities across Europe and beyond. This converter uses that same reference rate, so your figure will match what a European bank or the Bank of Japan reports for the same day. If you need a rate for a historical transaction or for tax reporting, note the publication date shown beneath your result.

For expats in Japan, the most common use case is converting between JPY and your home currency — USD, EUR, GBP, AUD, CAD, and more. The converter also supports neighboring Asian currencies (KRW, CNY, TWD, HKD, SGD, INR) and major emerging-market currencies, so it works regardless of where you call home. You can swap the two currencies with a single click to see the inverse rate.

YenWise builds each tool for expats who need numbers they can explain to an employer, a tax accountant, or themselves. We document official sources, show intermediate steps where it matters, and flag every simplification. Use the calculator as a planning layer on top of primary documents (源泉徴収票, ねんきん定期便, brokerage statements), not as a substitute for them.

Who Should Use This Converter

This tool is ideal for expats and residents in Japan who need quick, reliable currency conversions:

Because the rates are official ECB reference rates rather than retail bank rates, this tool is especially reliable for budgeting, expense tracking, and comparing costs across countries. It is less suited for predicting the exact amount a specific money-transfer service will deliver — always confirm the live retail rate with your provider before initiating a transfer.

If you are comparing job offers, planning a move within Japan, or preparing for year-end tax adjustment (年末調整) or final return (確定申告), run two or three scenarios side by side and save or screenshot the results for your records.

• •Expats sending money home or receiving transfers from abroad
• •Comparing prices and salaries between Japan and your home country
• •Businesses and freelancers invoicing in foreign currencies
• •Anyone cross-checking payslips, pension notices, or brokerage statements against official rules

How Exchange Rates Work

The European Central Bank publishes reference exchange rates every business day at approximately 16:00 Central European Time. These are mid-market rates, the midpoint between bid and ask prices in the interbank market.

This converter fetches rates via frankfurter.app, a free and open-source API that provides ECB reference rates. Cross-rates between any two currencies are calculated by dividing the target currency rate by the source currency rate.

Note that zero-decimal currencies like the Japanese Yen (JPY) and Korean Won (KRW) are handled automatically. The converter uses Intl.NumberFormat for accurate formatting in each currency convention.

Currency formatting matters more than people expect. The Japanese Yen (JPY) has no minor unit, so amounts are always whole numbers. The Korean Won (KRW) is the same. Most other currencies use two decimal places, and a few (like the Bahraini Dinar) use three. This converter reads each currency's standard from its locale definition and formats accordingly, so you never see a nonsensical value like "123.456 yen."

After you change an input, results update in the browser only — nothing is uploaded. Shareable URL parameters (where enabled) encode your scenario so you can reopen the same numbers later or send them to a spouse or accountant without creating an account.

Methodology & review

Spot rates are fetched from a public ECB-linked feed (Frankfurter) with hourly revalidation where available, and fall back to a labeled static table if the network fails. Cross rates use USD as the bridge currency. Display rounding follows common cash conventions per currency; it is not a bank’s mid-market or cash-desk rate.

Each tool is reviewed when underlying rules change (for example Reiwa-year tax reforms, NISA contribution caps, or pension premium tables) and whenever we expand the long-form explanation. The “Last reviewed” date on the page is the date of the latest substantive content or formula review.

We distinguish three kinds of numbers: (1) exact under the stated statute, (2) statutory estimates with known caps, and (3) planning assumptions you control. Assumptions such as expected investment return or remaining working years are never hidden inside a black box.

• •Primary sources linked in the Sources section below
• •Browser-side calculation — inputs stay on your device
• •Editorial review date shown in the byline above the tool

Important Notes

ECB reference rates are mid-market rates intended for informational purposes. Banks, exchange services, and transfer providers apply spreads, typically 1-3%, when converting currency for consumers.

For large international transfers, compare rates from multiple providers. Services like Wise (formerly TransferWise), Shinsei Bank foreign currency deposits, and other specialized services often offer better effective rates than standard bank transfers.

Reference rates are not published on weekends or European public holidays. On those days the converter shows the most recent available rate (typically Friday's). If you are planning a transfer for a Monday morning in Japan, the rate you see may differ slightly from the rate your bank applies, because banks trade on their own schedules and add their own margins on top.

Local city-tax nuances, special deductions (medical, housing loan credit details, foreign tax credits), and employer-specific social insurance rates can differ from simplified models. When your situation is complex, take the YenWise breakdown to a zeirishi or FP and adjust inputs using your actual forms.

Tips for Getting the Most Out of This Converter

A few practical habits will help you use currency conversion wisely when living between two economies:

• •Always check the publication date beneath your result — weekend and holiday figures carry forward from the last business day.
• •For tax or accounting purposes, use the official rate published by the Japanese tax authority for the relevant date, not a live mid-market rate.
• •When comparing transfer providers, ask for the all-in cost including fees and the exchange margin — the headline rate alone is misleading.
• •Large transfers (above roughly 1 million yen) often qualify for better margins at specialist services than at retail banks.
• •If you send money regularly, set up rate alerts with your provider rather than converting on a fixed schedule — timing can save 1 to 3 percent.
• •Bookmark the page with your scenario filled in, and re-run after any salary change, bonus, or rule update so your plan stays current.

Official Sources and Further Reading

• European Central Bank — Euro Foreign Exchange Reference Rates
• frankfurter.app — Free Exchange Rate API
• Bank of Japan — Foreign Exchange Rates