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Vehicle registration Number

VRN Checksum Tool

Simply enter the alphabetic prefix and numeric series (e.g., SGP107, SNR1777, ST60). The tool will compute the official checksum letter used by LTA for vehicle registration.

Check Your Singapore Vehicle Registration Number

Car Plate Checksum

Generate the official suffix letter for Singapore vehicle registration numbers

Enter letters followed by numbers (no suffix letter). We'll compute the official checksum.

Full Registration
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Checksum

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What is a VRN Checksum?

Every Singapore vehicle registration number (VRN) consists of a prefix (letters followed by numbers) and a single suffix letter. This suffix letter is called the checksum — an official character calculated using the LTA's algorithm to validate the registration number.

The checksum helps prevent errors and fraud by ensuring that the VRN follows the correct format. When you renew road tax, apply for COE, or transfer vehicle ownership, the full VRN including the checksum is required.

How Does It Work?

The checksum is derived from the alphanumeric prefix through a specific mathematical formula:

  1. Each letter in the prefix is converted to a numerical value (A=1, B=2, ..., Z=26)
  2. These values are combined with the numeric digits in the prefix
  3. A weighted calculation is applied to generate a single result
  4. The result maps to a specific letter (A–Z, excluding I and O)

Simply enter your VRN prefix (e.g., SBA1234, SLS567, SMZ8888) and this tool instantly computes the correct checksum letter for you.

Singapore VRN Format Guide

Singapore car plates follow a structured format. Here's what you need to know:

Prefix 1 to 4 letters followed by 1 to 4 digits
Checksum Single letter (A–Z, excluding I and O)
Examples SBA1234C, SLS567Z, SMZ8888J, SJ99X

Note: The checksum is an official part of your VRN and appears on your vehicle's licence plate.

Common Use Cases

Road Tax Renewal

Full VRN including checksum is required for LTA transactions

COE Bidding

Accurate registration number needed for COE applications

Vehicle Transfer

Ensure correct VRN when buying or selling a used car

VRN Verification

Verify if a registration number follows LTA format

Frequently Asked Questions

What if I already have a full plate with checksum?
The tool will automatically strip the existing checksum letter and compute it again. You can verify if your current checksum is correct.
Why are I and O excluded from checksum letters?
The letters I and O are excluded to avoid confusion with the numbers 1 and 0, ensuring clarity on licence plates.
Is this tool accurate for all Singapore VRNs?
Yes, this tool uses the official LTA algorithm and works for all standard Singapore vehicle registration numbers, including older and newer formats.
Do I need the checksum for my existing car plate?
Yes, your full VRN including checksum is required for LTA transactions such as road tax renewal, COE bidding, and vehicle transfers.

Not just engine and gearbox

What you will be covered

Our warranty covers up to 165 point checks — just like what you’d expect from an authorised dealer. Here’s the breakdown:

Engine & Transmission

Manual and Automatic Transmission

Topic 3 - Expressway

Topic 4 - Car Park

Topic 5 - Roundabout

Topic 6 - Navigation

Topic 7 - Maintenance

Topic 8 - Manual Cars (Optional)