4.41 cups.
Butter has a density of about 227 grams per cup (depending on the brand and temperature of the butter) so we need to do some conversions. Since kilograms measure weight and cups measure volume, we need to convert Kilograms to grams.
1kg=1000 grams
since we know that butter 227 grams of butter fit into a cup, we just have to divide 1000 grams by 227 grams to equal 4.41 cups.
So 1K of butter is slightly more than 4 cups.