Currency Converter
Type an amount, pick the two currencies, and this page converts it at the European Central Bank reference rates for the date printed beside the answer. The ECB publishes one set of euro rates on each working day, so the panel shows both legs of the conversion: how much of each currency one euro buys, then the rate between your pair and the converted amount. Pairs that include the euro use a rate the ECB published; every other pair, Czech koruna to US dollars included, is our own calculation from two of those published euro rates, and the page says which one you are looking at. This site keeps its own copy of that file: the server that answers this page asks the ECB for it at most once every twelve hours and hands that one set, unchanged, to everyone it answers, so two visitors served by different instances can briefly hold sets published on different days, which is why the date sits beside the answer. Your amount is converted in the page itself, so it is never sent to us or to the ECB. The honest limit is stated rather than hidden: a reference rate is published once a day for statistical use, and it is not the rate a bank, a card or a transfer service will settle at.
Loading the published reference rates.
The rates in the panel are the euro reference rates the European Central Bank published on the date shown. The server that answered this page keeps its own copy of that file, asked for at most once every twelve hours and handed unchanged to everyone that server answers, and the amount you type is converted in your own browser: it is never sent anywhere. The date beside the answer is the one you are actually looking at. The ECB publishes on working days only, so a Saturday or a public holiday shows the previous working day's set rather than a new one.
Dated, and published once a day. Arithmetic at the European Central Bank reference rate for the date shown beside every answer, cross-converted through the euro. Reference rates are published once each working day for statistical use: they are not the rate a bank or a card will give you. Rates from the dated sample that ships with this page for 2026-09-07. Amounts between two currencies that are not the euro are our own calculation from two published euro rates. Source: European Central Bank euro foreign exchange reference rates.
Common questions
- How many US dollars is 1,000 Czech koruna?
- At the rates on the page it is 1,000 multiplied by the dollars-per-euro rate and divided by the koruna-per-euro rate, because the ECB publishes everything against the euro. The panel shows all three numbers: koruna per euro, dollars per euro, and the koruna to dollar rate they produce, to six figures. The result is rounded for display only, to two places, or to four figures when it comes out smaller than a cent; the rate behind it is never rounded before the multiplication.
- Is this the rate my bank or card will give me?
- No. A European Central Bank reference rate is a daily observation published for statistical use, and it carries no fee, no spread and no card scheme markup. A bank, a card or a money transfer service sets its own price, with its own fee and its own spread, so the number it settles at is a different number. What this page shows is the reference observation for the date printed on it, not an offer from anybody.
- How often do the rates change, and what happens at the weekend?
- The ECB normally publishes one set of reference rates on each working day, in the afternoon, Central European Time. The server that answers this page asks the ECB for that file at most once every twelve hours and shows the observation date beside every answer, so a Saturday, a Sunday or a public holiday simply keeps showing the last working day's publication rather than inventing a new one. When the ECB cannot be reached, the page is answered from the copy that server already holds and waits a minute before asking again, rather than opening a connection for every visit. Past three days the page marks how old the figures are, and past seven days it stops converting and says so, because a week-old reference rate is not a statement about today.
- Which currencies can I convert here?
- Exactly the currencies in that day's published file, plus the euro itself at 1. If a currency is not in the file, the page says it does not carry it instead of estimating a rate for it, and a code that was replaced by a redenomination is named rather than converted: RON is the Romanian leu since the 2005 redenomination, and the obsolete ROL is neither in the file nor treated here as if it were RON.
- Why does everything go through the euro?
- Because that is what the source is. The ECB publishes euro foreign exchange reference rates, so every figure in the file is that currency per one euro. A pair with a euro leg, EUR to CZK for example, uses the published rate directly. A pair without one, such as CZK to USD or ISK to USD, is a cross rate we calculate from two published euro rates, and the readout labels it as our calculation.
- Is the amount I type sent anywhere?
- No. This site's server fetches one public file from the ECB, the same rates for everyone, and the conversion runs in your browser with that file. Nothing about your amount or your currency pair goes to the ECB or into any analytics event. Your browser remembers the pair and the amount under one local storage key so the page opens where you left it, and the Start over button at the top of the page forgets it.
- Where do the rates come from, and can I check them?
- They come from the European Central Bank euro foreign exchange reference rates, published at https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml and shown on the ECB's own page at https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html. The date printed on this page is the ECB's observation date for that set, so you can compare any figure here against the ECB's page for the same date.
- Can I copy the result with its date?
- Yes. The Copy button puts the whole answer on the clipboard: the amount and the converted figure, the rate between the pair, both euro legs, whether the pair was published or calculated, the ECB publication date, the note that a reference rate is not the rate a bank or a card will give you, and the address of the ECB page the rates came from. It is meant to be pasted into a spreadsheet or an email without losing the date it belongs to.
Arithmetic at the European Central Bank reference rate for the date shown beside every answer, cross-converted through the euro. Reference rates are published once each working day for statistical use: they are not the rate a bank or a card will give you.