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🔢IBAN Calculator

Easily convert your account number to IBAN format.

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Warning: Always verify the generated IBAN with your bank. This tool provides only a mathematical conversion.

Your IBAN

CZ00 0000 0000 0000

What is IBAN?

IBAN (International Bank Account Number) is the international account number format. It enables cross‑border payments and reduces input errors.

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What is BIC/SWIFT?

BIC (Bank Identifier Code), often called SWIFT, is the bank’s unique identifier. For SEPA (EU) payments, IBAN is often enough.

What is IBAN and what is it used for?

IBAN (International Bank Account Number) is the international bank account format. It’s required for cross‑border payments within SEPA and beyond.

Structure of Czech IBAN (CZ)

A Czech IBAN always has 24 characters and starts with country code CZ. It consists of:

  • Country code: CZ
  • Check digits: 2 digits (calculated by algorithm).
  • Bank code: 4 digits (e.g., 0800 for Česká spořitelna).
  • Account number: prefix and account number (padded with zeros).

Note: Always verify the generated IBAN in your online banking before sending a payment.

How to fill IBAN correctly

Accurate input is key. IBAN identifies the account in international payments.

Input data
Enter account number, optional prefix, and choose a bank.
Format check
The calculator computes check digits and validates the format.
Using IBAN
Use IBAN for international payments or when communicating with your bank.

Frequently asked questions

What does a Czech IBAN look like?

Czech IBAN starts with “CZ” and has 24 characters including check digits.

Is the result verified?

Yes, the format is calculated and checked. For final confirmation, use your bank.

Can I use IBAN in the Czech Republic?

Yes, but the standard domestic account format is more common.