Denmark IBAN calculator and checker

A Danish IBAN has 18 characters: DK, two check digits, then the registration number (reg. nr.) and account number (kontonummer). Enter the local details to build one, or paste an IBAN to check it, all in your browser.

Calculate or check a Danish IBAN

Enter the registration number (reg. nr.) and account number (kontonummer). The calculator pads short numbers with zeros, works out any national check digits you leave empty and adds the two IBAN check digits.

Switch to Check to paste an IBAN instead: it tests the length, characters, check digits and national check, and shows the bank, branch and account parts. Nothing you type leaves the page.

DK IBAN format

A Danish IBAN is 18 characters: DK, two check digits, then the registration number (reg. nr.) and account number (kontonummer).

In the printed format, k marks the check digits, a and b the bank, s the branch, sort code or prefix, c the account number and x a national check character.

IBAN length
18 characters
Check digits
2 digits after DK
Registration number (reg. nr.)
4 digits
Account number (kontonummer)
10 digits
National check digit
None
SEPA
Yes, EU member
Printed format
DKkk bbbb cccc cccc cc
Example IBAN
DK50 0040 0440 1162 43

Frequently asked questions

  • 18 characters: DK, two check digits, then the registration number (reg. nr.) and account number (kontonummer). Printed in groups of four, it looks like DK50 0040 0440 1162 43.

  • The four-digit registration number (reg. nr.) identifies the bank and branch. In the IBAN it follows DK and the check digits, and the account number (kontonummer) comes after it, padded with leading zeros to ten digits.

  • Yes. Denmark is an EU member state, so it is in SEPA: euro payments to a Danish IBAN can go by SEPA credit transfer. SEPA covers euro payments only, so a payment in Danish krone goes outside it.

  • With the ISO 7064 mod 97-10 algorithm. The registration number (reg. nr.) and account number (kontonummer) and the country code DK are turned into digits, and the two check digits are chosen so the whole number leaves a remainder of 1 when divided by 97. The calculator does this for you and rejects any input that cannot make a valid DK IBAN.

  • Yes. The calculator and the checker run entirely in your browser: the details you enter are never sent to a server, stored or shared. There is no sign-up and no fee.

  • Yes. The calculator covers 41 countries and the checker all 89 in the SWIFT IBAN registry. Pick a different country in the form above, or open its page from the list below.

Paying an IBAN from stablecoins? Holyheld Business converts USDC to EUR and pays it out by SEPA. See pricing or the guide to off-ramping USDC to an IBAN.

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