Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI.
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Result
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Formula
Categorizes users into BMI tiers and reports the target weight gain range.
Worked Example
Healthy Pregnancy Weight Gain
- Underweight (BMI < 18.5): 28 to 40 lbs (12.5 to 18 kg)
- Normal weight (BMI 18.5–24.9): 25 to 35 lbs (11.5 to 16 kg)
- Overweight (BMI 25.0–29.9): 15 to 25 lbs (7 to 11.5 kg)
- Obese (BMI ≥ 30.0): 11 to 20 lbs (5 to 9 kg)
- Most weight gain occurs in the second and third trimesters (approx. 1 lb per week)
These are goals, not rules. Individual circumstances like twins or other medical conditions may require personalized targets from your healthcare provider.
You can also calculate changes using our Pregnancy Due Date Calculator, BMI Calculator or Calorie Calculator.
Frequently Asked Questions
Why is weight gain tracked during pregnancy?
Healthy weight gain supports the baby's growth and reduces the risk of complications like gestational diabetes or preterm birth.
What if I am carrying twins?
The recommended weight gain for twins is significantly higher (typically 37 to 54 lbs for those with a normal starting BMI).
Should I ever lose weight during pregnancy?
Weight loss is generally not recommended during pregnancy, even for obese individuals. If you are experiencing unintended weight loss, contact your doctor.
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I can help you understand the pregnancy weight gain calculator formula, interpret your results, and answer follow-up questions.
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