Vehicle Checksum Formula

The checksum, also known as the last alphabet of a vehicle license plate, of a bus registration number is derived from the following formula.

Suffix Table

 * Note: Letters F, I, N, O, Q, V & W are omitted.

Example
For example, the registration plate of SG5999.

Using the above formula for SG-prefixed plates, you should get a statement like this: 11–(5×5)–(4×9)–(3×9)–(2×9). A quick input of the statement on Google should give a result of -95.

Using the result, mod the number with 19, you will get a number from 0 to 18. You can mod the number by 19 using Google. For the above example where the result is -95, type -95 mod 19 into the Google search bar and it would calculate the answer, 0.

Compare the answer against the table above for the suffix.

Hence the checksum for SG5999 is Z.

How "Mod 19" works
Mod 19 works in a way that the number  is deducted from a number until the remainder reaches 18 or less.

For example, if you get a result of  from the given formula.
 * 1) Remove the minus sign (modulus)
 * 2) Deduct   from   as many times as you can before remainder reaches 18 or less
 * 3) Substitute remainder   with the letter Z and it will be the suffix of the license plate