How to Find My National Grid Reference

Written by stephania m
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How to Find My National Grid Reference
Find your National Grid Reference. (Map image by Stephen VanHorn from

A National Grid Reference represents a specific geographical location on a map. It is widely used in the United Kingdom. The most commonly used National Grid Reference contains both letters and numbers, such as NN 150 160, where each set of three digits represents a 100-meter coordinate and the letter represents a specific grid square. Government agencies frequently use National Grid References when describing survey data and displaying maps. Ireland uses a similar National Grid Reference system.

Skill level:


  1. 1

    Open the Free Map Tool webpage (see Resources). This site features an interactive map of Britain. Click on your location. The output displays your National Grid Reference.

  2. 2

    Visit the Free Map Tool Convert Postcode to NGR page (see Resources). Enter your mailing postcode in the query box to get the corresponding National Grid Reference.

  3. 3

    Go to the Ordnance Survey website (see Resources). This site links to a document that gives step-by-step instructions for finding your National Grid Reference on your own.

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