What is the difference between NRIC and FIN?

An NRIC (prefix S or T) is issued to Singapore citizens and permanent residents. A FIN (prefix F, G or M) is a Foreign Identification Number issued to foreigners holding a pass, such as an Employment Pass or Work Permit. Both share the same 9-character format and checksum scheme.

How is the NRIC check letter calculated?

The seven digits are multiplied by the weights 2,7,6,5,4,3,2 and summed. For prefixes T or G add 4, for M add 3. The sum is taken modulo 11, and the remainder indexes a prefix-specific table of letters to give the check letter.

What do the prefixes mean?

S marks citizens or PRs issued before 2000, T those issued from 2000 onward. F marks foreigners issued a FIN before 2000, G from 2000 onward, and M is the newer FIN series introduced in 2022 to expand capacity.

Does a valid check letter mean the person is real?

No. A valid check letter only proves the number is internally consistent. It does not confirm the identity exists or that any pass is active. Treat NRIC and FIN numbers as personal data, which is why this tool runs entirely offline.

Why was the M series introduced?

The F and G FIN ranges were running out of capacity. The M series, introduced in 2022, adds a new prefix and a slightly different checksum offset (add 3 instead of 4) to provide a fresh pool of numbers for foreign pass holders.

Singapore NRIC/FIN Validator

A Singapore NRIC or FIN is a 9-character identifier used across HR, banking and Ministry of Manpower work-pass workflows. It has a prefix letter, seven digits and a final check letter. This validator runs the official checksum entirely in your browser, so the sensitive number never leaves your device.

How it works

The check letter is derived from the seven digits:

Multiply the digits by the weights 2, 7, 6, 5, 4, 3, 2 and sum the products.
Add an offset for the newer series: +4 for prefixes T or G, +3 for M.
Take the sum modulo 11 to get a remainder.
Use the remainder to index a prefix-specific table of letters:

S, T  →  J Z I H G F E D C B A
F, G  →  X W U T R Q P N M L K
M     →  K L J N P Q R T U W X

The letter at that position must equal the ninth character. For example, S1234567D gives a remainder of 7, and the S/T table at index 7 is D — so it validates.

Notes

The prefix encodes both the holder type (citizen/PR versus foreigner) and the issuance era. The M series, added in 2022, uses its own table and a +3 offset. A passing check letter proves only internal consistency, not that the identity exists or any pass is active. Because these are personal data, the tool performs no network calls.