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Validation

Mod-11 Checksum Calculator

· Last updated：2026-06-23

Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes.

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Written by the Elysia Tools team
Weight50
Hash30
ID17
Check Digit8

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Validation
Input types
select, text, number
Output type
text
Sample coverage
4
API ready
Yes

Overview

The Mod-11 Checksum Calculator allows you to validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm. It supports standard weighting schemes including ISBN-10, Norwegian ID, and generic 2-7 weights to ensure data integrity and prevent input errors.

When to use

  • When verifying the validity of ISBN-10 book identifiers or Norwegian national identification numbers.
  • When generating valid test data or mock identifiers that conform to the Modulus-11 check-digit standard.
  • When troubleshooting data entry errors in systems that use the ISO 7064 Mod-11 checksum algorithm.

How it works

  1. 1Select the operation mode: either validate an existing number or generate a new one.
  2. 2Choose the appropriate weighting scheme, such as ISBN-10, Norwegian ID, or the generic 2-7 weights.
  3. 3Input the target number for validation, or specify the desired total length and optional prefix for generation.
  4. 4The tool calculates the Modulus-11 checksum and outputs the validation result or the newly generated number with its check digit.

Use cases

  • Validating ISBN-10 codes during cataloging to ensure no digits were mistyped.
  • Generating mock Norwegian ID numbers for software testing environments.
  • Checking custom serial numbers that utilize the generic 2-7 Mod-11 weighting scheme.

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'.

FAQ

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.

Hub

Check-Digit and Checksum Validation

Normalize an identifier, select its specified checksum path, and verify format before accepting it.

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

Outcome

The tool generates a valid 11-digit number starting with '120390' and appends the correct Mod-11 check digit.