I've just that and I'm one trouser size to big ! I'm tending not to go by weight more by the fact I've had to by smaller clothes ! I remember the last time I went for a medical and doctor did height and weight and told me to ignore the "official" recommendations because I will never be that weight !Remember watching a programme about weigh loss and it said yo measure your height and cut a piece of string to that length, fold it in half and try and put it round you. When it goes round you then youre the right size for your height. Waist = half your height. Haven't tried it yet to see how far away I am