Pregnancy Weight Gain Calculator
Compare today’s scale to where many guidelines suggest you might be by this point in pregnancy, based on Institute of Medicine style total weight-gain brackets for your prepregnancy BMI group. Twins, swelling, athletes, hyperemesis—your obstetric clinician personalizes targets.
- Height and pre-pregnancy weight set your BMI group automatically unless you override it.
- Current weight is what you weigh today (same scale/clothes consistency helps comparisons).
- Gestational weeks completed so far—not the due date alone. If unsure, use your clinician’s ultrasound dating or gestational age calculator.
Without shoes, same method each time if you repeat.
Roughly conception weight—the number your clinic often uses for BMI grouping.
Today’s measurement.
Whole weeks completed (e.g. end of week 24).
Choose "Automatic" unless your clinician told you to use a specific category.
Guidance snapshot (education only)
BMI group applied: Normal weight before pregnancy (from your inputs)
Many guidelines suggest gaining about 25–35 lb total by full term—not all in one trimester.
About 17.0 lb gained since conception (mid guideline curve), bracketed loosely by 14.2–19.8 lb.
About 8.8 lb above your pre-pregnancy weight right now (about 4.0 kg difference). Compare gently—fluid shifts day to day.
Nutrition support
Use clinic advice for multiples, vomiting, hypertension, diabetes, thyroid disease, eating disorders in remission, and medication safety. This calculator's curves are illustrative teaching math only.
Important usage notes & limitations
Reproductive timelines interact with contraception cessation, PCOS phenotype, transgender hormone therapy intensity, low body-fat athletic amenorrhea, and perimenopause. Hormonal contraception intentionally suppresses natural ovulatory signals until washout stabilization — calendar methods become meaningful only once cycles resume reliably.
See also: Pregnancy Due Date Calculator · Women's health calculators hub.