✦ Free Online Tool ✦

Pregnancy Weight Gain Calculator

Find out exactly how much weight you should gain during pregnancy based on your pre-pregnancy BMI and current week.

πŸ’— This calculator uses guidelines from the Institute of Medicine (IOM). It is for informational purposes only and does not replace advice from your doctor or midwife. Always consult your healthcare provider about your individual weight gain goals.
Pre-Pregnancy Weight
kg
Height
cm
Current Week of Pregnancy
Week 20
Second Trimester
Week 1 Week 14 Week 28 Week 42
Are You Expecting Twins?
Current Weight (Optional β€” for progress tracking)
kg
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Pre-pregnancy BMI
Recommended Total Weight Gain
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kg during pregnancy
1st Trimester
Weeks 1–13
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2nd Trimester
Weeks 14–27
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3rd Trimester
Weeks 28–40
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Your Progress This Pregnancy
Week 1 Week 20 Week 40
BMI categoryβ€”
IOM recommended rangeβ€”
Weight gain so farβ€”
Expected gain at this weekβ€”
Recommended rate (2nd & 3rd tri)β€”
Weeks remainingβ€”
πŸ’š Healthy Pregnancy Tips
βœ“Eat nutrient-dense foods β€” focus on quality over quantity. You only need about 300 extra calories per day in the second and third trimester.
βœ“Stay active with pregnancy-safe exercise like walking, swimming or prenatal yoga β€” always with your doctor's approval.
βœ“Weigh yourself once a week at the same time of day for the most consistent tracking.
βœ“Do not try to lose weight during pregnancy. Gaining too little weight can affect your baby's development.
βœ“Talk to your midwife or OB if your weight gain is significantly above or below the recommended range.