Account Number Format Validator

ByAboki Payment Team
Bank Account Number Format Validator by Country | AbokiCalculator
ACCOUNT NUMBER VALIDATOR
Format Validator

Bank Account Number Format Validator

Check if an account number matches the expected format for 18 countries. Instant format validation — length, digit type, and structure.

Account Format Checker
Your Input — Character Breakdown
Format Reference
Expected Length
Character Type
Payment System
Example
🛈 Format check only. This tool validates the format structure of the account number — length and character type. Only the bank can confirm whether this account is active, linked to the right name, or belongs to the intended recipient. Always verify account details directly with your recipient before sending money.
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Why Bank Account Number Formats Differ by Country

Bank account number formats vary dramatically by country because banking systems evolved independently over decades before international standardisation efforts began. Countries that developed early electronic banking systems in the 1970s and 80s created their own internal numbering formats, and those formats became deeply embedded in national payment infrastructure.

The UK standardised on 8-digit account numbers paired with 6-digit sort codes in the 1960s. Nigeria standardised all account numbers to exactly 10 digits in 2011 through the NUBAN policy. Australia uses a 6-digit BSB code plus a variable account number. The US never standardised at all, leaving each bank to determine its own format within loose guidelines.

Europe attempted to solve this fragmentation with IBAN (International Bank Account Number), a standard that encodes the country, bank, and account number in a single alphanumeric string. Over 70 countries now use IBAN for international transfers, though many still use local account formats for domestic payments.

Format check vs account verification: Validating the format means checking that the number has the right length and character type. It does not confirm the account is real or active — only the bank can do that. This tool checks format only.

Country-by-Country Account Number Guide

CountryLengthFormatSystemCompanion Code
🇳🇬 Nigeria10 digitsNumeric onlyNUBANNone (NUBAN is universal)
🇬🇧 UK8 digitsNumeric onlyDomestic6-digit sort code (XX-XX-XX)
🇺🇸 USA4–17 digitsNumeric onlyDDA (varies)9-digit ABA routing number
🇨🇦 Canada5–12 digitsNumeric onlyDomesticTransit + Institution (8 digits)
🇦🇺 Australia6–10 digitsNumeric onlyBSB system6-digit BSB (XXX-XXX)
🇬🇭 Ghana10–16 digitsNumeric onlyGHIPSS/GIPGIP clearing code
🇰🇪 Kenya10–16 digitsNumeric onlyRTGS/PESALINKCBK sort code
🇿🇦 South Africa9–11 digitsNumeric onlyDomestic6-digit branch code
🇮🇳 India9–18 digitsNumeric onlyNEFT/RTGS/IMPS11-char IFSC code
🇵🇭 Philippines10–16 digitsNumeric onlyPESONet/InstaPayNone / SWIFT for intl
🇮🇩 Indonesia10–16 digitsNumeric onlyBI-RTGS/SKNNone / SWIFT for intl
🇵🇰 Pakistan16 digits / 24 IBANNumeric / IBANPRISM (RTGS)PK IBAN for international
🇦🇪 UAE23 chars (IBAN)AE + alphanumericIBAN standardNone (IBAN is self-contained)
🇸🇦 Saudi Arabia24 chars (IBAN)SA + alphanumericIBAN standardNone (IBAN is self-contained)
🇲🇽 Mexico18 digitsNumeric only (CLABE)SPEICLABE is self-routing
🇧🇩 Bangladesh13–17 digitsNumeric onlyBEFTN9-digit routing number
🇸🇬 Singapore9–12 digitsNumeric onlyGIRO/PayNow3+3 digit bank/branch code
🇲🇾 Malaysia10–16 digitsNumeric onlyIBG/DuitNowNone for DuitNow

Account Number Format Errors: What Happens to Misdirected Money

Wrong account number errors happen more often than people expect, and the outcomes vary significantly depending on whether the incorrect number resolves to a real account.

Scenario 1: Account number does not exist

If the account number does not exist at the receiving bank, the payment is rejected during validation and returned to the sender's account. This usually takes 1-5 business days and may incur a return fee from your bank. This is the best-case failure.

Scenario 2: Account number belongs to someone else

If the number happens to be a valid account belonging to a different person, the funds may be credited to that person's account. Recovering misdirected funds requires your bank to contact the receiving bank, who then needs the account holder's cooperation to return the money. This can take weeks and is not guaranteed.

Prevention: Always ask the recipient to double-check their account number before you send. Never copy an account number from memory — copy-paste or ask for written confirmation. For large amounts, send a small test transfer first and confirm receipt before sending the full amount.

Scenario 3: Name mismatch

The UK introduced Confirmation of Payee (CoP) in 2020, which matches the recipient name against the account number before allowing the transfer. Many UK banks now warn or block transfers where the name does not match. Nigeria's NUBAN system allows name lookup before confirming a transfer. These systems help but are not yet universal globally.

Always verify: Before sending any significant amount, confirm the recipient account number and name with the recipient directly through a separate channel — not just by replying to the same email thread, as invoice fraud can redirect payments to fraudulent accounts.

Frequently Asked Questions

A UK bank account number is always exactly 8 digits. It is always paired with a 6-digit sort code (XX-XX-XX) that identifies the bank and branch. Some older bank statements or cards may show 7 digits — in that case, add a leading zero to make it 8. Never confuse the sort code with the account number.
A Nigerian bank account number (NUBAN) is always exactly 10 digits. This is standardised across all Nigerian banks since 2011 under the CBN's NUBAN policy. Every bank customer in Nigeria has a unique 10-digit NUBAN. You can look up any Nigerian account number by entering it in your bank app or dialling *966*00# to see the account name before sending.
US bank account numbers vary by bank and can be 4-17 digits long. Chase typically uses 9-10 digits, Bank of America 12, Wells Fargo 10. There is no national standard for US account number length. They are always used with a 9-digit ABA routing number. Find your account number on the bottom of a paper check (it is the middle group of numbers, between the routing number and check number).
Australian bank account numbers are 6-10 digits long and are always used together with a 6-digit BSB (Bank-State-Branch) code. The BSB identifies the bank and branch, while the account number identifies your specific account. Both are required for domestic transfers. For international wires, use the SWIFT code instead of the BSB.
A sort code identifies the bank and branch (in the UK and some other countries). An account number identifies the individual customer account within that bank branch. For UK transfers, you need both: the 6-digit sort code (XX-XX-XX) to identify the destination bank, and the 8-digit account number to identify the specific account. The sort code does not contain any personal information about the account holder.
If the account does not exist, the payment is rejected and returned (1-5 business days, with possible return fee). If it resolves to a real account belonging to someone else, the funds may be credited to that person. Recovering misdirected funds requires your bank to contact the receiving bank and request a return, which the account holder must agree to. This can take weeks. Always verify account details with the recipient directly before sending, especially for large amounts.
Account numbers are found in: (1) your bank mobile app under Account Details or Account Information, (2) your bank statement, (3) the bottom of a paper cheque (for US/UK/Canada/Australia), (4) your internet banking portal, or (5) by calling your bank. For Nigeria, dial *966*00# to see your NUBAN. In the UK, your account number and sort code appear on your debit card and on any bank correspondence.
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© AbokiCalculator. Format validation only. Does not confirm account existence or ownership. Always verify with your recipient before transferring funds.

Aboki Payment Team

The Aboki Payment Team maintains the global bank code directory and financial tools on AbokiCalculator. They specialize in SWIFT, IBAN, routing numbers, and international payment infrastructure. Their goal is simple, make cross-border transfers easier by providing accurate directories, verification tools, and calculators that help users send money with confidence.

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