This converter exchanges amounts between 31 world currencies — from the US dollar, euro, and British pound to the Romanian leu, Indian rupee, and Turkish lira — using the European Central Bank's daily reference rates. These are mid-market rates published once per business day, with no retail spread, so they show what a currency is actually worth rather than what a bank will charge you.
Suppose you put the default values into Currency Converter:
Plug those into the formula out = (amount / rate_from) · rate_to and the result is:
All conversions run through the European Central Bank's euro foreign exchange reference rates, the daily rates the ECB publishes for major currencies. Those rates come from a daily concertation procedure between European central banks and are normally published around 16:00 CET on every working day. They are mid-market rates — the midpoint between wholesale buy and sell prices — with no retail spread built in. To convert, the calculator divides your amount by the from-currency rate to reach a common base, then multiplies by the to-currency rate: out = (amount / rate_from) × rate_to, the same cross-rate arithmetic used throughout foreign exchange. It deliberately excludes card markups, transfer fees, and weekend movements, since reference rates exist only for business days.
References: ECB reference rates (mid-market).
Last reviewed July 2, 2026 · Editorial policy