If you have a whole batch of coordinates to convert visit our batch conversion page.
The Coordinate Converter converts GPS latitude and longitude or cartesian XYZ coordinates to the equivalent OSGB36 National Grid eastings and northings, and vice-versa, using Ordnance Survey's National Grid Transformation OSTN02. Coordinate conversion from GPS latitude and longitude coordinates to ETRS89 UTM coordinates is also included. It also converts GPS ellipsoid heights to orthometric (mean sea level) heights on the relevant Ordnance Survey mapping datum (Ordnance Datum Newlyn for mainland Britain), using the National Geoid Model OSGM02.
To read an article about the development of the OSTN02 transformation see the November/December 2001 edition of Geomatics World Magazine.
To read a report about the development of the OSGM02 Geoid Model.
A spreadsheet that includes many projection coordinate functions, including functions to re-format coordinates into the Degrees, Minutes, Seconds format.
For more information about OSTN02.
For more information about OSGM02.
For general information on coordinate systems and conversions.