Pregnancy Weight Gain Calculator
The IOM publishes gain ranges keyed to starting BMI. Locate yourself at your current week — single or twin pregnancy.
Recommended gain by week 20
1.8–17.5 kg
- Total pregnancy range
- 25–35 lb
- Pre-pregnancy BMI
- 25
Ranges are guidance — obstetrician advice always wins.
How the Pregnancy Weight Gain Calculator works
The calculation follows the standard method used across the US — no shortcuts, no hidden assumptions. Here is exactly what happens behind the scenes:
Frequently Asked Questions
How does the Pregnancy Weight Gain Calculator work?
Enter your numbers above and results update instantly using standard formulas, computed entirely on your device.
Is the Pregnancy Weight Gain Calculator free to use?
Yes — completely free with no signup required, and it works on phones, tablets, and desktops.
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