IBAN Calculator

Author: Henrick Yau
- May 14, 2025
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Calculators

Generate, validate, and analyze IBAN (International Bank Account Number) formats. This calculator helps verify IBAN numbers for international banking transactions.

IBAN Tools

About IBAN Numbers

The International Bank Account Number (IBAN) is an internationally agreed system of identifying bank accounts across national borders to facilitate the communication and processing of cross-border transactions.

IBAN Structure

An IBAN consists of:

  • Country Code: 2 letters representing the country (e.g., DE for Germany)
  • Check Digits: 2 digits that validate the entire IBAN
  • Basic Bank Account Number (BBAN): Country-specific format including bank code, branch code (sometimes), and account number
IBAN Length

IBAN length varies by country:

  • Germany (DE): 22 characters
  • United Kingdom (GB): 22 characters
  • France (FR): 27 characters
  • Spain (ES): 24 characters
  • Italy (IT): 27 characters
  • Netherlands (NL): 18 characters
IBAN Uses
  • International wire transfers
  • SEPA (Single Euro Payments Area) transactions
  • Direct debits across borders
  • Standardizing account identification internationally

Formula for IBAN Validation

Rearranged IBAN: Move the first 4 characters to the end of the string
Replace letters with numbers: A = 10, B = 11, ..., Z = 35
Final Step: If (numeric IBAN) mod 97 == 1, the IBAN is valid

What the IBAN Calculator Does

The IBAN Calculator is a practical tool that allows users to validate, generate, and analyze International Bank Account Numbers (IBANs). It helps ensure that the IBAN format is correct and adheres to international banking standards. Whether you're preparing a transfer or verifying account details, this calculator improves accuracy and reduces errors in cross-border payments.

Why Validate or Generate IBANs

  • Verify IBANs: Quickly check if an IBAN is correctly structured and valid.
  • Generate IBANs: Create compliant IBANs for supported countries using bank and account numbers.
  • Analyze Structure: Break down an IBAN into its individual components like country code, bank code, and account number.

How to Use the IBAN Calculator

1. Validate an IBAN

  • Go to the "Validate IBAN" tab.
  • Enter an IBAN (e.g., DE89370400440532013000).
  • Check the box if you want it formatted with spaces for easier readability.
  • Click Validate IBAN to see if the number is valid and view its details.

2. Generate an IBAN

  • Switch to the "Generate IBAN" tab.
  • Select a country and enter the required bank code and account number.
  • Click Generate IBAN to receive a complete IBAN with correct check digits.

3. Analyze an IBAN

  • Open the "Analyze IBAN" tab.
  • Paste an IBAN to break it into segments like country, bank, and branch codes.
  • Click Analyze IBAN to view a structured summary of the input.

Benefits for International Payments

This IBAN validation tool helps users ensure banking information is accurate before making international transactions. It's useful for:

  • Businesses preparing payroll or vendor payments abroad
  • Individuals transferring funds internationally
  • Financial institutions conducting account checks

Like tools such as the VAT calculator for calculating tax-inclusive pricing or the credit card calculator for estimating interest costs, this IBAN number checker improves financial clarity. It complements other financial calculators like:

Questions About IBAN Validation

What is an IBAN used for?

An IBAN is used to identify bank accounts across borders and reduce payment errors. It is essential for international transactions, especially within Europe and other IBAN-compliant regions.

Can I use this calculator for any country?

The tool supports a selection of countries including Germany (DE), France (FR), United Kingdom (GB), and more. Each country has a unique IBAN structure and length.

Does a valid IBAN mean the account exists?

No. A valid IBAN means the format and check digits are correct, but it doesn’t confirm the account is open or active.

What happens if I send money to an invalid IBAN?

Payments may be delayed or rejected. Using this IBAN validation tool reduces the risk of failed transactions.

Essential for Cross-Border Banking

The IBAN Calculator is an essential resource for anyone dealing with international banking. It minimizes the chance of errors, simplifies formatting, and saves time by providing accurate information instantly. Whether you're processing payments or checking account details, this IBAN number checker offers reliability and peace of mind.

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