iban calculator bic

What this IBAN calculator and BIC checker does

If you send or receive international payments, getting account details right matters. One wrong character in an IBAN or BIC can delay your transfer, trigger return fees, or send money to the wrong processing route. This page gives you a practical IBAN calculator BIC tool to quickly check formatting, structure, and basic validity before you confirm a payment.

The calculator performs three core tasks: IBAN checksum validation, BIC format validation, and cross-checking the country code between both values (when both are provided). It can also generate IBAN check digits from a country code + BBAN.

IBAN vs BIC: the quick difference

• IBAN identifies the individual bank account for a transfer.
• BIC (SWIFT) identifies the bank (or branch) handling that transfer.
• IBAN can be up to 34 characters and includes a built-in checksum.
• BIC is 8 or 11 characters and follows ISO 9362 structure.

How to use this calculator

1) Validate existing payment details

Enter an IBAN, optionally add a BIC, then click Validate IBAN & BIC. You’ll get:

• Normalized IBAN formatting (grouped in blocks of 4)
• Country and length checks (for supported countries)
• Checksum result using the Mod-97 rule
• BIC structure validation (8/11 character format)
• Country match hint between BIC and IBAN

2) Generate check digits for a new IBAN

If you already have a BBAN, type the 2-letter country code plus the BBAN and click Generate IBAN. The calculator computes valid check digits and returns a complete IBAN candidate.

How IBAN checksum validation works

IBAN validation uses a mathematical integrity test. The tool rearranges the IBAN (moving the first 4 characters to the end), converts letters to numbers (A=10, B=11, ... Z=35), and calculates the number modulo 97. A valid IBAN produces remainder 1.

This catches common data-entry errors such as swapped digits, missing characters, or typos in the check-digit area.

Common issues this tool can detect

• Wrong IBAN length for a given country code
• Invalid IBAN checksum (fails Mod-97)
• BIC not matching standard 8/11 format
• Potential IBAN/BIC country mismatch warning

Important limitations

Validation is not the same as account verification. A mathematically valid IBAN does not prove the account is open, active, or belongs to the intended recipient. Likewise, a valid BIC format does not guarantee routing eligibility for a specific payment product.

Always confirm beneficiary details through trusted channels, especially for high-value or first-time payments.

Practical transfer safety checklist

• Verify beneficiary name and account details independently.
• Reconfirm any last-minute change requests by phone.
• Run IBAN and BIC checks before release.
• Start with a small test transfer when possible.
• Keep approval workflows for business payments.

FAQ

Does every country use IBAN?

No. Many countries use IBAN, but not all. Where IBAN is not used, domestic account/routing formats and SWIFT instructions apply.

Can I derive the exact bank name from BIC here?

This tool validates structure and parses components, but it does not include a live SWIFT directory lookup.

Why does my IBAN pass but payment still fails?

Reasons can include closed accounts, transfer restrictions, sanction screening, currency corridor limitations, or intermediary bank requirements.