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UK Coordinate Converter

The UK’s Ordnance Survey has a free high-accuracy coordinate converter for transforming from GPS coordinates (latitude/longitude/WGS84) to OSGB National Grid (eastings and northings):


In addition to this single-coordinate-set converter, there’s an online batch converter, and additional converter options for coordinates in the Irish Grid (good for Northern Ireland and the Republic of Ireland). There’s supposedly a free Windows stand-alone converter that you can download after filling out registration info, but the registration form doesn’t like my US phone number, so I couldn’t check it out. The OS provides both a set of equations/parameters, and a free DLL, if you want to incorporate the coordinate converter in your own software. And there’s a page with more information on coordinate systems used in Great Britain, including their free “Guide to coordinate systems in Great Britain“.

Other free services at the Ordnance Survey website include a RINEX data server for GPS post-processing, and several searchable databases of assorted geodetic control points:

  • 900 GPS reference marks
  • 750,000 benchmarks
  • 21,000 horizontal control stations

HT to Malc.

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3 Responses to “UK Coordinate Converter”

  1. 1 Mapperz

    A few other sites are just as useful in converting UK coordinates:

    javascript code and the maths (old but the maths is good.)

  2. 2 Nick

    Are there any sites or tools for the batch conversion of (European 1950) DMS to European UTM coordinates for areas outside the UK? To complicate matters, ideally the tool I am looking for should work on a Mac, as I don’t have a PC nor Windows. Thank you SO much for any tips on this

  3. 3 Leszek Pawlowicz
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