Start out by measuring from the inner crotch to how many inches long the legs need to be. Hubby has short legs (shhh don't tell him I said that). He needs his pants to be 27 inches. I need one inch to fold up so I mark 28 inches with a Sharpie.
Mark straight across with a ruler.
Cut and save the piece.
Use it to measure the second leg, mark and cut it.
If the only reason I bought my serger was to hem jeans then it was money well spent! Serge all the way around, just barely trimming. Yes I know it's white thread, and I know I should change it to blue, but I hate changing it and besides who's going to see the inside of Hubby's pants? If you don't have a serger I'm sure you could do a zig-zag stitch using your sewing machine. We just want to stop the fray.
Remember that extra inch when you measured? Fold the jeans up one inch and pin.
Make sure the seams lay flat.
Pin all the way around.
Use your sewing machine, and with blue thread, stitch all the way around. I like to follow the serger line.
Iron everything flat.
This step is purely optional but it will look more professional if you do it. Change your thread to gold and, using your sewing machine, sew around about a 1/2 inch from the edge.
Because the hem is only doubled over you can even backstitch over the seams, something I could never do if I had them folded up twice without risking a broken/bent/flying needle.
The inside doesn't look so hot but when Hubby starts wearing his pants inside out then I'll worry about it. I'm sure there are a zillion different ways to hem jeans but this is what works for me. I hope you enjoyed the tutorial :)
Update: This tutorial featured on:
Creative Mom Cafe