Free tool
IBAN calculator
Enter a Czech account and get its IBAN – or paste an IBAN and get the account. A typo is caught by the Czech National Bank check, and we say which part it is in.
Enter an account or an IBAN – the result shows here.
How a Czech IBAN is built
CZ65 0800 0000 1920 0014 5399 = CZ + check digits 65 + bank code 0800 + prefix 000019 + account number 2000145399.
Need the IBAN for a QR code? The QR payment generator takes the plain account number directly.
Questions people ask
How do I turn a Czech account number into an IBAN?
A Czech IBAN has 24 characters: CZ, two check digits, the bank code (4 digits), the prefix padded with zeros to 6 digits and the account number padded to 10. The check digits follow ISO 13616 (mod 97). The calculator does it for you.
Does it work the other way, from IBAN to account?
Yes. Paste a Czech IBAN and we show the account with its prefix and bank code, the bank's name and the BIC.
How do I spot a typo in an account number?
Czech account numbers carry a checksum (mod 11 with Czech National Bank weights), separately for the prefix and the number. It catches most typos – swapped or wrong digits. The calculator says which part fails.
What is a BIC (SWIFT)?
The bank's international code, e.g. GIBACZPX for Česká spořitelna. You mostly do not need it for euro SEPA payments; for other foreign payments you do.