Data & Converters
World Currency Converter
Convert between 30+ world currencies using daily reference exchange rates published by the European Central Bank.
Result
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— EUR
1 USD = … EUR
Rates from the European Central Bank via Frankfurter.app. Indicative only — not for trading.
How currency conversion actually works
A currency converter applies an exchange rate — the price of one currency in terms of another — to an amount you enter. The rate moves constantly as currencies are traded around the world, so any converter is only as good as the freshness and source of its rates. This tool uses daily reference rates from the European Central Bank, which are widely used for accounting and informational purposes.
The ECB publishes a single set of rates each business day, quoting every supported currency against the euro. To convert between two non-euro currencies, the tool effectively converts the source currency to euros and then to the target — a two-step that yields the correct cross-rate.
Why exchange rates move
Currencies trade in a vast global market that runs 24 hours a day. Rates respond to interest rate differentials, inflation data, trade balances, political events and central bank policy. When a central bank raises rates, its currency often strengthens because higher rates attract capital; when inflation surprises, a currency can weaken as purchasing power erodes.
For travellers, the practical implication is that the rate you saw last month may not be the rate you get at the airport. Checking a converter before a trip helps you budget, but always treat the number as an estimate of what your card provider will actually charge.
The difference between mid-market and retail rates
The rate shown here is a mid-market or reference rate — the midpoint between buying and selling prices, with no margin. No consumer ever transacts exactly at this rate. Banks, card networks and exchange bureaus add a spread (the difference between their buy and sell prices) and sometimes a flat fee on top.
A typical card foreign-transaction cost is 1–3% above the mid-market rate, plus any issuer fee. Specialist travel cards and some fintech accounts approach the mid-market more closely. Knowing the reference rate lets you judge whether a quoted retail rate is fair.
Cross rates and triangulation
When neither currency in your conversion is the euro, the tool triangulates through EUR: source → EUR → target. This is mathematically equivalent to a direct cross-rate and is exactly how the ECB dataset is constructed, since every rate is quoted against the euro. The result is correct and consistent with how most reference-rate services operate.
Triangulation also explains why some currency pairs can show odd-looking precision: the cross-rate is a ratio of two separately rounded euro rates, so tiny rounding differences appear in the fourth decimal place. For any practical purpose this is irrelevant.
Practical tips for travellers
Check the rate before you travel and again on arrival, then compare it to what ATMs and exchange bureaus offer. Avoid airport exchange bureaus, which typically have the worst spreads. If your card charges foreign-transaction fees, a specialist travel card or a no-fee card can save several percent over a long trip.
When a merchant offers to charge your card in your home currency (dynamic currency conversion), decline. The merchant's rate is almost always worse than your card network's rate. Always choose to pay in the local currency.
Using this converter for accounting
ECB reference rates are an accepted basis for expense reporting and accounting in many jurisdictions because they are neutral, published by an official institution, and freely available with a date stamp. If you record the rate and its date alongside a converted amount, you have a defensible record. For tax filings, some authorities require their own published rates on the transaction date — check the local rule.
For businesses with recurring multi-currency needs, automating conversion against a reference rate like this one keeps historical records consistent and auditable, even though the rates are not real-time trading rates.
Frequently Asked Questions
Where do the exchange rates come from?
Rates are daily reference rates published by the European Central Bank and served via the free Frankfurter.app API. They are updated once per business day, around 16:00 CET.
Are these rates suitable for trading?
No. ECB reference rates are indicative, mid-market rates for information and accounting. Retail exchanges, card providers and banks apply a spread, so the rate you actually receive will differ.
Why is the rate the same every day?
ECB rates update once per business day. If the rate appears unchanged, you are viewing the most recent business day's rate. Weekend rates remain at Friday's values.
How many currencies are supported?
About 30 major world currencies are available in this tool, covering the most traded and travelled currencies. The underlying ECB dataset covers a similar set.
Does the converter account for fees?
No. The displayed rate is the pure exchange rate. To estimate what you will actually pay, add your card or exchange provider's fee or spread, typically 1–3%.
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