IBAN Calculator
Validate and format UK IBANs, or generate a UK IBAN from bank code, sort code and account number. Free.
IBAN calculator
Validate a UK IBAN (check format and MOD 97 checksum) and see it formatted with spaces. Or generate a UK IBAN from your 4-letter bank code (from BIC), 6-digit sort code and 8-digit account number. UK IBANs are 22 characters. Always confirm with your bank.
Frequently Asked Questions
What is an IBAN?
IBAN stands for International Bank Account Number. It identifies a bank account for cross-border payments. UK IBANs are 22 characters: GB + 2 check digits + 4-letter bank code + 6-digit sort code + 8-digit account number.
How do I validate a UK IBAN?
Enter or paste the IBAN (with or without spaces). The calculator checks that it is 22 characters, starts with GB, and passes the MOD 97 checksum. It then shows Valid or Invalid and the formatted IBAN.
Can I generate a UK IBAN?
Yes. Enter your 4-letter bank code (from your BIC), 6-digit sort code and 8-digit account number. The calculator generates the correct UK IBAN with check digits. Confirm with your bank.
Is the IBAN calculator free?
Yes. Validate and format UK IBANs for free. No registration required. For other countries, check your bank or a dedicated IBAN tool.
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Cite This Calculator
Reference this calculator on your website or in your work using the citation below:
HTML Citation Code:
<p>Calculator: <a href="https://onlinecalculator.co.uk/finance/iban-calculator" target="_blank">IBAN Calculator</a> - OnlineCalculator.co.uk</p>APA Style Citation:
OnlineCalculator.co.uk. (2025). IBAN Calculator. Retrieved from https://onlinecalculator.co.uk/finance/iban-calculatorNote: This calculator is free to use and reference. No permission required for educational or commercial citation.