Free Vehicle Identification Number Checkdigit
- VIN Checkdigit Decoder Lookup


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VIN - Vehicle Identification
Number - Checkdigit
The following example Vehicle Identification Number VIN may be used to illustrate how to calculate the checkdigit value 1M8GDM9A?KP042788, where the question mark will be the unknown check digit.

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VIN 1 M 8 G D M 9 A ? K P 0 4 2 7 8 8
Value 1 4 8 7 4 4 9 1 0 2 7 0 4 2 7 8 8
Weight 8 7 6 5 4 3 2 10 0 9 8 7 6 5 4 3 2
Products 8 28 48 35 16 12 18 10 0 18 56 0 24 10 28 24 16
Position 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Weight 8 7 6 5 4 3 2 10 0 9 8 7 6 5 4 3 2

The products (8,28,48,35,16,12,18,10,0,18,56,0,24,10,28,24,16) are all added together to obtain a Sum of 351

Checkdigit = Sum Mod 11

If the checkdigit value is 10 then this goes back into the VIN Vehicle Identification Number as a character X.


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How Do I Calculate VIN Check Digit?

Step 1
Transliteration consists of removing all of the letters from a VIN Vehicle Identification Number and substituting them with their appropriate numerical counterparts. These numerical values can be found in the table below. I, O and Q are not allowed, and can not exist in a valid VIN; for the purpose of this chart, they have been filled in with N/A (not applicable). Numerical digits use their own values.
Transliteration key: values for VIN Decoding
A: 1 B: 2 C: 3 D: 4 E: 5 F: 6 G: 7 H: 8 N/A
J: 1 K: 2 L: 3 M: 4 N: 5 N/A P: 7 N/A R: 9
S: 2 T: 3 U: 4 V: 5 W: 6 X: 7 Y: 8 Z: 9
Step 2
Step 3
The following table shows how the products (products = Value x Weight) of a VIN Vehicle Identification Number may be evaluated.
The following is the weight factor for each position in the VIN. The 9th position is that of the checkdigit. It has been substituted with a 0, which will cancel it out in the multiplication step.