IBAN Calculator
Calculate IBAN from bank code and account numberEnter your local bank code and account number to generate a valid IBAN. Check digits are calculated using the ISO 13616 mod-97 algorithm — entirely in your browser. Supports 12 countries including Germany (BLZ), Netherlands, UK (sort code + bank identifier), and other SEPA countries.
How IBAN check digits are calculated
1. Assemble BBAN from your inputs → append country code + "00"
2. Replace each letter with its numeric value (A=10 … Z=35)
3. Check digits = 98 − (number mod 97), zero-padded to 2
4. Final IBAN = country code + check digits + BBAN
For testing only
This tool generates structurally valid IBANs — the check digits will pass mod-97 validation. However, the generated IBAN may not correspond to a real bank account. Use the generated IBANs for API testing, sandbox environments, and payment flow development only. Never send real funds to a generated IBAN without first verifying the account exists.