Pregnancy Weight Gain by Week
Slide how many pregnancy weeks are complete to see roughly how much total weight gain a smooth guideline model would expect by then, for each prepregnancy BMI group. Pair it with our personalized pregnancy weight tracker for your own measurements.
The week number should reflect completed gestational weeks (what your clinician or dating ultrasound uses). Lines on the graphic are decorative; numeric readout carries the explanation.
Matches the cohort labels used in classic U.S. total gain tables—your doctor may personalize further.
Drag between 4 and 40 to explore how cumulative totals rise in this smooth model.
By the end of about week 20, cumulative guideline-model gain for Normal BMI before pregnancy often lands near 10.8–15.2 lb total since conception—before birth, most expected gain is still accumulating.
Bands come from simplifying total-guideline envelopes into smooth curves—they don’t replace nuanced trimester-by-trimester discussion.
Due dates & ultrasound
If your week count is uncertain, confirm dating with your care team. For non-weight due dates, see the pregnancy due date calculator.
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.