Yep, I would be overweight at 70kg - my BMI would be 27 then
I think my "overweight" (BMI 25) weight is 65kg.
I like to use it to work out my minimum weight, as I don't think it would be good to go below 18.5 (as if I could ever get there anyway
) I've read anything from 18.5 to 20 as being the lowest of the normal range, so I choose to believe the lower LOL.
For me, tell you what, 20.6 or whatever it is now, FEELS overweight
So it also depends what weight you feel happy at as well...