IBAN Calculator
You can use the IBAN calculator to calculate the valid IBAN and BIC on the basis of the account number, bank sort code (BLZ) and country.
IBAN Calculator
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Learn moreCalculate IBAN
Convert your national bank account details into an international IBAN with our free IBAN Calculator.
What You'll Need
To calculate an IBAN, you only need your bank code, account number, and the country in which the account is maintained.
IBAN Structure
An IBAN is made up of several parts, which are partly predefined and partly calculated:
| Element | Length | Description |
|---|---|---|
| Country Code | 2 characters | For Germany: "DE" |
| Check Digits | 2 digits | Mathematically calculated |
| Bank Code | 8 digits | Identifies the bank |
| Account Number | 10 digits | Padded with leading zeros to 10 digits |
Example: German IBAN
DE89 3704 0044 0532 0130 00
IBAN Calculation in Detail
Check Digit Calculation
In addition to the basic data, an IBAN always contains a check digit consisting of 2 digits. This is calculated in a defined mathematical procedure and added to the composition of the IBAN.
How exactly the check digit is calculated is explained in our FAQ under How is the IBAN check digit calculated? in an understandable way.
Account Number Verification
Not only the IBAN but also most account numbers have a check digit. This check digit is calculated from the existing numbers by an algorithm and is usually located at the end of the account number.
In Germany, this algorithm is not uniform. There are many different methods for calculating check digits, which are defined for individual bank sort codes and updated at irregular intervals.
Advantages of Our IBAN Calculator
Dual Verification
IBANTEST considers both the check digit for account numbers and for the IBAN.
Algorithm Diversity
Support for all verification algorithms for German banks.
Regular Updates
Bank data updates according to official publication schedules.
SEPA Compliant
All IBANs are calculated according to official SEPA standards.
Please Note
Important: Our applications cannot provide information about whether the IBAN entered or calculated actually exists at the bank or whether the account is covered. This information can only be provided by the financial institution where the account is maintained.
IBAN FAQs
Helpful Tips
Finding Your Bank Code
You can find your bank code on your debit card, in your online banking portal, or on your account statements.
Account Number Format
Enter your account number exactly as it is stored by your bank - without spaces or separator characters.
Saving Your IBAN
After calculating your IBAN, make note of it for future use or save it in your online banking profile.
Ready to Get Started?
Use IBANTEST for precise IBAN validation and calculation – reliable and user-friendly.