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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.
| 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 as a character X.
How Do I Calculate VIN Check Digit?
Step 1
Transliteration consists of removing all of the letters from a VIN 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
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.