Compare entered pregnancy weight gain with published BMI-based total reference ranges and a clearly derived singleton illustration.
01 / PURPOSE-SPECIFIC INPUTS
Published total ranges are not personalized targets. Singleton weekly shading is a derived illustration; twin weekly curves are not inferred.
02 / RESULT & INTERACTIVE INSPECTION
Use individualized prenatal care, not this graph, to interpret weight changes. It does not diagnose pregnancy or fetal health, prescribe weight loss or label a person’s progress as good/bad. ACOG emphasizes clinical judgment; adolescents and complex pregnancies require tailored assessment.
Week 20: 3.68–5.6 kg. This interpolation is not a validated weekly target.
Entered gain: 5 kg at week 24. Published total range: 11.34–15.88 kg.
| Week | Lower kg | Upper kg |
|---|---|---|
| 13 | 1 | 2 |
| 14 | 1.38 | 2.51 |
| 15 | 1.77 | 3.03 |
| 16 | 2.15 | 3.54 |
| 17 | 2.53 | 4.06 |
| 18 | 2.91 | 4.57 |
| 19 | 3.3 | 5.08 |
| 20 | 3.68 | 5.6 |
| 21 | 4.06 | 6.11 |
| 22 | 4.45 | 6.63 |
| 23 | 4.83 | 7.14 |
| 24 | 5.21 | 7.65 |
| 25 | 5.6 | 8.17 |
| 26 | 5.98 | 8.68 |
| 27 | 6.36 | 9.19 |
| 28 | 6.74 | 9.71 |
| 29 | 7.13 | 10.22 |
| 30 | 7.51 | 10.74 |
| 31 | 7.89 | 11.25 |
| 32 | 8.28 | 11.76 |
Rows 1–20 of 28
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Enter adult pre-pregnancy measurements and current weight. Choose singleton or twin reference guidance. Read total ranges and distinguish illustrative weekly bands from clinical targets. Read the worked explanation and scope alongside every result.
Compare entered pregnancy weight gain with published BMI-based total reference ranges and a clearly derived singleton illustration. Interactive controls inspect the calculated model without silently changing submitted assumptions.
Pregnancy Weight Gain Calculator inputs and calculations remain in browser memory. No external processing API receives entered dates, measurements, coefficients or financial values. Ordinary website page requests may still be logged. Clipboard access occurs only when you choose Copy Result.
CDC reports total gains by pre-pregnancy BMI: 28–40 lb below BMI 18.5, 25–35 lb at 18.5–below 25, 15–25 lb at 25–below 30, and 11–20 lb at BMI 30 or higher.
CDC reports IOM/NRC provisional twin totals of 37–54, 31–50 and 25–42 lb for normal, overweight and obese groups. Its separate underweight-twin range, 50–62 lb, is study-based (Luke et al. 2003), not an IOM-specific recommendation.
No. It linearly connects an approximately 1–2 kg first-trimester assumption at week 13 to the published total endpoints at week 40. It is explicitly a derived illustration, not a validated personalized weekly trajectory.
Published total-gain ranges do not establish a particular delivery week or weekly path. The calculator does not invent a twin trajectory or extend a singleton curve before week 13 or after week 40.
Pre-pregnancy BMI is pre-pregnancy kilograms divided by height in meters squared. Entered gain is current minus pre-pregnancy weight. One pound is exactly 0.45359237 kilograms.
No. Neither the range nor the marker assesses fetal health or replaces individualized prenatal care. The tool does not recommend weight loss during pregnancy or derive special targets for separate obesity classes.