Hi there I see you are serious about getting back into shape I think electric scales are a bit more accurate but if you'd want to know your exact weight you'd have to hop into one of those huge water tanks while scientist work out the exact body weight you have and who has the time and money for that. Weigh yourself just after you pee in the morning. Keep away from any processed foods and if you can afford it eat organic fruits and vegetables, avoid anything that says diet on it these things contain more chemicals than the non diet foods