Transverse Mercator Calculator

A facility for converting latitude/longitude co-ordinates to co-ordinates in metres on a Transverse Mercator projection.

Note:

• The results of using the calculator provided on this page are believed to be accurate to 1 metre, but the accuracy is not in any way guaranteed.
• The results will certainly not, however, be accurate to 1 metre in situations where lat/long co-ordinates are based on a geodetic datum which is different from that used in the selected conversion.
• Do not enter negative values for lat/long co-ordinates west of Greenwich or south of the equator. Specify W or S instead.
• There are few validity checks on the input data.
• For UTM conversions, the option exists for automatic calculation of the Central Meridian or manual entry of the Central Meridian. The calculation assumes that the standard UTM longitude zones are 6 degrees wide, except for the special zones around Svalbard and south-west Norway. For projections outside of the standard UTM zones you should manually enter the Central Meridian for the projection required.
• This facility requires a Web Browser which recognizes Tables and JavaScript.

For visitors who have come to this page directly rather than from the DMAP home page:

• Map of the World showing UTM Grid Zones

• The DMAP Information Pages

Comments or suggestions about this facility are invited and can be sent to Alan Morton

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