I'm trying to calculate Northing Easting in QGIS. I can get it to calculate my lat/long using $y and $x in the field calculator. I changed coordinate systems to what I want it displayed at, but it's still calcing the lat/long
Try saving a copy of the layer and when you get to the 'save as' menu, set the CRS there instead. I had similar issues and that worked for me, although it may be a bit of workaround more than a solution.