I'm 6 foot, 220 lbs pounds, waist is around 40 to 41 inches. seller suggested I get 40 and they were right. I had a few inches on waist to move around so it wasn't tight. I don't like tight so if you got a 40 to 41 inch waist in USA then size 40 is perfect. thank you seller very nice jeans. they got room in the legs too to move, thank God they are NOT skinny jeans. in the legs there is room to move nicely.