Vartala er skv. Alþjóða póststaðli frá UPU frá 27. janúar 1998.

Doc. refS10-2, Status 2 (ems) and 1 (other items). Date of acceptance 18th. of April 1996.

Weight modulus 11 formula.

The formula is as follows

• Apply weigthing factors to basic number using the followin weighting factors 86423597.
• Optain the sum of these numbers
• Divide the sum by 11 (eleven).
• Subtract the remainder from 11.
• If the result is in the range of 1 to 9, use the reslult as the check digit.
• If the result is 10, use 0 as the check – digit.
• If the result is 11, use 5 as the check – digit.

Example

Number	4	7	3	1	2	4	8	2
Weighting factors	x8	x6	x4	x2	x3	x5	x9	x7
Gives	32+	42+	12+	2+	6+	20+	72+	14+	=200

200 divided by 11 gives a remainder of 2
11 minus 2 gives 9: the check digit is 9
Complete self cheecking number: 473124829

Dæmi: Vartala - Forritunardæmi

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