I have a database with a list of address and their location as an East and North coordinate. An example is: East=431833 North=336684 Postcode=DE22 4LF

When I try to convert this address using this tool: http://www.engineeringtoolbox.com/utm-latitude-longitude-d_1370.html

The result in longitude and latitude in Google gives me a location in Africa, not England where the address actually is.

Can anyone tell me which format the East and North coordinates are in and how to convert them?


1 Answer 1


Your coordinates are Ordnance Survey GB (OSGB36 Airy 1830 ellipsoid) 431833,336684 (base on a false origin with the Transverse Mercator projection. http://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid

To convert them correctly to Lat/Lng

Use this site:http://www.nearby.org.uk

example: http://www.nearby.org.uk/coord.cgi?p=431833%2C336684 look for the result in yellow Converts to 52.926628 -1.527923 (WGS84)

copy and paste into google maps


You can also just use the postcode for google maps


Which returns the correct location - as is automatically geocoded into lat/lng coordinates

  • @Mapperz---how did you know the CRS!?
    – elrobis
    Dec 4, 2012 at 19:37
  • from experience
    – Mapperz
    Dec 4, 2012 at 19:37
  • The presence of postcode is the tip, it seems.
    – elrobis
    Dec 4, 2012 at 20:00

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