Provides trimester-by-trimester recommended weight gain curves following Institute of Medicine (IOM) clinical guidelines for single and twin pregnancies.
Track healthy weekly weight gain targets during pregnancy based on pre-pregnancy BMI.
Evidence-based estimations. Consult a physician for personalized guidance.
Official clinical definitions and validated mathematical models
The National Academy of Medicine (formerly IOM) guidelines define healthy maternal weight gain to minimize risks of gestational diabetes, preeclampsia, and macrosomia.
| Pre-Pregnancy BMI | BMI Category | Singleton Total Gain | Singleton 2nd/3rd Tri Rate | Twins Total Gain |
|---|---|---|---|---|
| < 18.5 | Underweight | 28 – 40 lb (12.5 – 18.0 kg) | 1.0 – 1.3 lb / week | Not Specified |
| 18.5 – 24.9 | Normal Weight | 25 – 35 lb (11.5 – 16.0 kg) | 0.8 – 1.0 lb / week | 37 – 54 lb (16.8 – 24.5 kg) |
| 25.0 – 29.9 | Overweight | 15 – 25 lb (7.0 – 11.5 kg) | 0.5 – 0.7 lb / week | 31 – 50 lb (14.1 – 22.7 kg) |
| ≥ 30.0 | Obese | 11 – 20 lb (5.0 – 9.0 kg) | 0.4 – 0.6 lb / week | 25 – 42 lb (11.3 – 19.1 kg) |
Track pregnancy progress, current week, trimester, and key developmental milestones.
Calculate estimated date of delivery (EDD) based on LMP, conception, or IVF date.
Find your most fertile days and estimated ovulation dates for the next 6 cycles.
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