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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):
Weight Gained During Pregnancy. The amount of weight you put on during pregnancy depends on your normal body mass index (BMI), which is determined by dividing your weight in pounds by your height in inches. If this figure is below 18.5 you are underweight, and can expect to gain 28 to 40 lbs.during pregnancy, according to babycentre.co.uk. If your BMI is between 18.5 and 24.9 you are of average weight and should gain between 25 and 35 lbs.f this figure is below 18.5 you are underweight, and can expect to gain 28 to 40 lbs. during pregnancy, according to babycentre.co.uk. If your BMI is between 18.5 and 24.9 you are of average weight and should gain between 25 and 35 lbs.