Convert coordinates
WGS84, SWEREF 99, RT90, Web Mercator and UTM.
Method
Select the source and target coordinate systems. In this form, WGS84 uses X = longitude and Y = latitude in decimal degrees. Projected coordinates use X = easting and Y = northing in metres. Proj4 performs the conversion; the map shows the resulting WGS84 location. Check the source document's axis order and projection zone before entering a coordinate.
Example
The starting point uses longitude 18.0686 and latitude 59.3293 in Stockholm. Convert it to SWEREF 99 TM, then reverse the conversion and check that you return close to the original position.