Singapore NRIC Check Letter

The Singapore NRIC number consists of seven digits and a letter appended behind. This letter is calculated from the first seven digits taking MODULUS ELEVEN (11) . This system is commonly used.

The check sum is computed as follow:

Multiply each digit in the NRIC number by its weight.

Add together the above products.

Divide the resulting sum by ELEVEN (11).

Subtract the remainder from ELEVEN (11) to give the check digit.

In Singapore, the weight for the NRIC number is as follow:

position |
1 | 2 | 3 | 4 | 5 | 6 | 7 |

weight | 2 | 7 | 6 | 5 | 4 | 3 | 2 |

The conversion (look-up) table to convert the check digit into the corresponding alphabet is shown below:

Check Digit | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |

Alphabet | A | B | C | D | E | F | G | H | I | J | K |

For a DOS program to calculate the check sum goto: Chue Wailian Singapore NRIC