The perfect Butter Cream Icing

I've always used cream cheese in my recipes but somehow never knew the correct measurements.
Here it is now:
226g butter
680grams cream cheese, you would have to buy 3 of the 250g packs in order to make up this.
6cups of icing sugar, any leftovers can always be frozen for later.
Mix butter and Cream cheese until smooth.
Add Icing sugar and mix until you can no longer taste the grains.