1. Determine how long you want your pants to be. Read more on marking a hem.
2. Mark four lines on the outside of the pants. For men's pants, it's most common to mark every 1 1/4" or 1 1/2". For women's cuffs, you can do almost any width you want. For these pants I marked every 1 1/2".
The first line you mark is the hem line. This line determines the finished length of the pants. The next line down is the 1st fold line. The third line you mark is the 2nd fold line. The last line you mark is the cut line which is where you'll cut off any excess. The distance to the cut line can be a little bit shorter if you'd like, but don't cut it any closer than 1/2". (You can see that my lines are already ironed.)
4. Fold the pants on the first fold line.
outside of the pants inside of the pants