Which rate this uses
Every working day around 16:00 Central European Time the European Central Bank publishes euro foreign exchange reference rates for about 30 currencies. They come from a daily concertation between central banks and are the standard reference for contracts, accounting and statistics in Europe. This converter uses the latest published table and shows its date next to every result.
Reference rates are mid-market rates: the midpoint between buying and selling. Your bank, card or exchange office adds a spread or fee on top, so the amount you actually receive will usually be a little lower. On weekends and TARGET holidays no new table is published and the previous working day's rates stay current.
Worked example
With EUR/USD at 1.1650 and EUR/BRL at 6.3000, 100 US dollars is worth 100 × 6.3000 ÷ 1.1650 ≈ 540.77 Brazilian reais. The converter first turns dollars into euros, then euros into reais, exactly as the ECB's cross-rate method does.
For amounts that matter — invoices, rent abroad, tax filings — use the rate your bank or the tax authority specifies for the date in question; many tax authorities publish their own official rates.
How this works
The ECB publishes how many units of each currency one euro buys (for example USD 1.1650). To convert between two non-euro currencies the converter goes through the euro:
rate(from → to) = rate_EUR→to ÷ rate_EUR→from
result = amount × rate(from → to)
Rates are fetched from the ECB at most once an hour; one lookup per currency pair counts towards the daily limit, and changing the amount is recalculated in your browser. Results are not rounded until they are displayed.
Frequently asked
How often are the rates updated?
Once per TARGET working day, around 16:00 CET. On weekends and holidays the latest table stays in effect; its date is shown under the result.
Why is my bank's rate different?
Reference rates are mid-market rates for information. Banks and card networks quote their own buy and sell rates and add fees, so the amount you get is usually lower.
Which currencies are supported?
The about 30 currencies in the ECB reference table, including USD, EUR, GBP, JPY, BRL, CNY, INR, MXN and CHF. Cryptocurrencies are not included.
Is there a limit?
Each new currency pair you look up counts as one call: 50 a day without an account and 200 a day on a free account. Changing the amount doesn't count.
Sources
Reviewed Oct 18, 2026 · test vectors fixtures/calculators/finance/currency-converter/