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You can also work out your BMI using our calculator. There are no official UK guidelines for how much weight you should gain over your pregnancy. There is only general advice that most women put on somewhere between 10kg and 12.5kg (22lb to 28lb) (NHS 2011). You'll gain most of the weight after 20 weeks (NHS 2011). See below for average weight gain (IOM 2009):
The appropriate amount of weight gain depends on your pre-pregnancy weight as well as your height. Here's the formula: Normal weight (kg)/height (square meters) = weight gain indicator. If your indicator shows less than 18, you are skinny. You should gain 44 pounds (20 kg) during the entire span of pregnancy. If your indicator ranges from 18 to 20, you are thin. You should gain 28.6-37.4 pounds (13-17 kg) during the entire span of pregnancy. If your indicator ranges from 20 to 23, you are normal. You should gain 26.4 pounds (12 kg) during the entire span of pregnancy.