Follow the steps below to convert location data from one format (osgb36 to wgs84 or wgs84 to osgb36) to another. Your data can be tab, comma or space delimited (the character between your data fields).
You can paste data directly from your Excel spreadsheet or Google spreadsheet document (the format will be detected automatically and you only need to identify the columns holding your location data i.e. the columns holding the lat lng, grid reference or X Y values.
When the location data columns are identified press convert. You can copy the converted data directly back in to your spreadsheet.