What weighting schemes does this calculator support?

It supports ISBN-10 (weights 10 to 2), Norwegian ID (weights 3,7,6,1,8,9,4,5,2), and a generic scheme (weights 2 to 7).

How does the validation mode handle spaces or dashes?

The tool automatically ignores non-digit separators like spaces and dashes when validating the input number.

What is the purpose of the prefix option in generate mode?

The prefix option locks the leading digits of the generated number, allowing you to create valid numbers with specific starting sequences.

Can I generate a number of any length?

You can generate numbers with a total length ranging from 2 to 30 digits, including the check digit.

What is the Modulus-11 algorithm?

It is a checksum method defined by ISO 7064 that uses weights and a modulo 11 operation to calculate a single check digit, helping detect transcription errors.

Mod-11 Checksum Calculator

Examples

1. Validating an ISBN-10 Code

Librarian

Background

A librarian is cataloging a batch of older books and wants to verify if a handwritten ISBN-10 code is correct before entering it into the database.

Problem

The ISBN-10 code '0306406152' needs validation to ensure the check digit matches the payload.

How to use

Set the mode to 'Validate', select the 'ISBN-10' weighting scheme, and enter '0306406152' into the number field.

Mode: validate, Scheme: isbn-10, Number: 0306406152

Outcome

The tool confirms that the number is valid, verifying that the check digit '2' matches the Mod-11 calculation.

2. Generating Test Norwegian IDs

QA Engineer

Background

A QA engineer is testing a registration form that requires a valid Norwegian ID number.

Problem

The engineer needs a valid 11-digit Norwegian ID starting with a specific birthdate prefix for test cases.

How to use

Set the mode to 'Generate', select the 'Norwegian ID' weighting scheme, set the total length to 11, and input the prefix '120390'.

Mode: generate, Scheme: norwegian-id, Length: 11, Prefix: 120390

Mod-11 Checksum Calculator | Elysia Tools

Mod-11 Checksum Calculator

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Examples

1. Validating an ISBN-10 Code

2. Generating Test Norwegian IDs

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