While the metric system is great, I live in America, the land of the imperial system. In projects where I want to take DEM GeoTIFFs and create labeled contour lines, it’s nice to have those displayed in feet. Here are the simple steps to convert a GeoTIFF from meters to feet in QGIS:

  1. Open your DEM files in QGIS
  2. Raser > Raster Calculator
  1. Select and double-click the layer you want to convert. This will put it below in the Raster Calculator Expression text box
  2. After your layer name, add *3.28084 , the number of feet in a meter.
  1. Click OK
  2. Now you have a new DEM layer in feet instead of meters. You can now use the regular process to add contour lines and labels.