sweetened condensed milk

For 2/3 c sweetened condensed milk:
Combine 3/4 c evaporated milk with 3/4 c sugar, and cook for 12 minutes.

For 1-1/2 c (14 oz can) sweetened condensed milk:
Combine 1-2/3 c (large can) evaporated milk with 1-1/3 c sugar, and cook for 12 minutes.