Taking all the visible cream from whole milk that has been left to stand and separate gets you 15 - 20% fat, depending on the breed of cattle and what they've b

Taking all the visible cream from whole milk that has been left to stand and separate gets you 15 - 20% fat, depending on the breed of cattle and what they've been eating. That's comparable to what the UK calls "single cream" (18%) and the US calls "light cream" (18% minimum, can be up to 29%).