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Pregnancy Weight Gain Calculator
Healthy weight gain in pregnancy depends on what you weighed before you conceived. Enter your pre-pregnancy weight and height to see the recommended range for where you are now and by full term.
How to use it
- Enter your height in centimetres and the weight you were just before becoming pregnant.
- Enter how many weeks pregnant you are now, and whether you are carrying one baby or twins.
- Optionally add today’s weight, and the calculator will tell you whether you are inside the recommended band.
Where these ranges come from
- The ranges follow the Institute of Medicine (IOM) guidelines, which are the basis of most obstetric practice worldwide and are grouped by pre-pregnancy BMI.
- Most of the gain belongs in the second and third trimesters. First-trimester gain of only 0.5–2 kg is normal, and losing a little in early pregnancy because of nausea is common.
- Asian populations develop metabolic risk at lower BMI levels than the standard WHO cut-offs. Your obstetrician may use Asian-Indian cut-offs (overweight from 23, obese from 25) and set a tighter target for you.
- Weight is only one indicator. What matters clinically is the baby’s growth on scan, your blood pressure, and your sugar levels.
When to raise it with your obstetrician
Mention it at your next visit if you are gaining much faster or much slower than the range shown, if you gain more than 2 kg in a single week, or if sudden swelling of the face and hands comes with the weight — that combination can signal pre-eclampsia and needs same-day review. Very low gain matters too, because it is linked to growth restriction and preterm birth.
Frequently asked questions
How much weight should I gain in pregnancy?
For a single baby: about 12.5–18 kg if you started underweight, 11.5–16 kg at a normal BMI, 7–11.5 kg if overweight, and 5–9 kg if obese. Twins need more — roughly 17–25 kg at a normal starting BMI.
I have lost weight in the first trimester. Should I worry?
A small loss from nausea and vomiting is common and usually harmless as long as you can keep fluids down. Tell your doctor if you are vomiting repeatedly, passing very little urine, or losing more than about 5% of your body weight — that may be hyperemesis and needs treatment.
Am I really eating for two?
No. You need roughly 340 extra calories a day in the second trimester and 450 in the third — about one extra meal-sized portion, not double meals. Protein, iron, calcium and folate matter far more than sheer quantity.
Does gaining too much affect delivery?
It can. Excess gain raises the risk of gestational diabetes, high blood pressure, a large baby, and caesarean delivery. It is worth managing, but do not attempt weight loss or restrictive dieting during pregnancy without your obstetrician’s guidance.
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