Pretty good with some deficiencies

No ads and GUI is excellent. Number keyboard needs to be changed to match the standard calculator layout, numbering from bottom to top. This fault causes me to enter the wrong numbers all the time. Imperial measures need to be added, as does a fuel mileage conversion between miles per US gallon, litres per hundred kilometres, and miles per imperial gallon.

GR Calgary about Ad-Free Unit Converter, v4.2