You can convert between geographic coordinates and Universal Transverse Mercator (UTM) coordinates using form from this online tools
Geographic coordinates are entered and displayed in decimal degrees. Negative numbers indicate West longitudes and South latitudes. UTM coordinates are entered and displayed in meters. The ellipsoid model used for computations is WGS84.
If you have a Java 1.1-compliant browser, and especially if you need to use an ellipsoid model other than WGS84, you may want to try the Coordinate and Datum Transformations tool.