The Gold prices UK fix of the day determines the daily Gold price per Gram for the precious metal. Different Karat of gold has a different percentage of gold in them, which determines the gold market price depending on the purity of the gold. Few of the popular Karat and how to determine the price are listed below. Our Gold price calculator uses the live UK Gold market price. Just enter the grams in the right Karat section and the calculator will give you the Value of Gold when you sell your scrap gold to us.