It is equal to a xl in slim
it would be a 10 or a 12
boys size 12 is for a 26 inch waist, and a boys size 14 is for a 28" this is no size 13, but there are "slims" and "Husky" versions of size 12's and 14's. Boys at this age can be problematic to fit because of the obvious differences in ages and physical maturity of boys between the ages of 10 -14, hip size and everything else can be radically different from one boy to another who are technically the same "size." Tip: NEVER buy a boy pants without him being able to try them on first. They grow from week to week.
The average size 8 waist measurement in Australian clothing is 63cms. Each size increases by 5cms thereafter ..ie: size 10 is 68cms and size 12 is 73cms. Just keep in mind that the waist measurement still goes on the actual waist... not the lower position that pants are worn today. If you are buying pants on Ebay or such, it is best to measure the rise also... which is waist to crotch measurement. The best way to do this is to measure a favourite pair of pants rather than measuring yourself.
27 in jeans size is a 4 your small in jeans size
US size 12, UK size 16
Size 16
12 to 14
In the UK a size 10 dress or skirt has a 28 inch waist and sizes go up in increments of 2". Size 12 would therefore have a 30" waist, size 14, a 32" inch waist, size 16, a 34" waist, size 18, a 36" waist and so on. For a waist 33" you would either have to settle for a size 14, with a 32 inch waist, or go one larger and get a size 16, which would have a 34" waist.
size 12
I'm a 34 waist and 46 hips and I am in a 12.
12 to 14
The size charts that I have seen show a size 12 is between 25-27 in inches for the waist. Many charts neeeded additional information to produce an answer, for instance height.