Singleton pregnancy reviewing a cited range
See the complete total and second/third-trimester intervals.
Enter prepregnancy height/weight and choose Singleton.
Sees a range and first-trimester assumption, not a point target.
Pregnancy Weight Gain Calculator
Look up cited IOM and ACOG pregnancy weight-gain ranges from prepregnancy BMI, including explicit singleton, twin and missing-evidence boundaries.
Built for Health1 documented formula3 recommended next stepsPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Prepregnancy height and weight plus singleton or twin pregnancy type
Output to expect
Prepregnancy BMI category and the matching cited total range; singleton rows also show the complete second/third-trimester interval and first-trimester assumption
How it works
Calculates BMI, selects the cited IOM/ACOG row and returns an explicit no-established-range state for underweight twins instead of extrapolating
- Treat population ranges as discussion context, not a personal target or fetal-growth assessment; prenatal care may recommend a different plan.
- The cited twin table has no underweight range or weekly-rate table. Do not borrow another category or apply singleton weekly rates.
Choose your path
Built around the job you need to finish
Look up cited IOM/ACOG pregnancy weight-gain ranges from prepregnancy BMI while preserving singleton weekly intervals and the missing underweight-twin evidence boundary.
Twin pregnancy with normal, overweight or obese BMI
Use the cited twin total table without a fabricated weekly rate.
Choose Twins and inspect the matching total range and weekly-table limitation.
Does not reuse singleton weekly rates for twins.
Underweight adult with twins or a clinically complex pregnancy
Recognize when the cited table has no answer.
Receive an explicit no-established-range result and take it to the prenatal team.
Does not borrow another BMI row or self-prescribe gain.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- Weight Gain During Pregnancy — Resource SheetNational Academies of Sciences, Engineering, and Medicine · Primary singleton total and second/third-trimester rate ranges by prepregnancy BMI, including the first-trimester assumption.
- Weight Gain During Pregnancy — Committee OpinionAmerican College of Obstetricians and Gynecologists · Clinical summary of IOM singleton/twin ranges, individualized-care boundary, and twin ranges only for normal, overweight and obese BMI categories.
- Weight Gain During Pregnancy — Consensus StudyNational Academies Press · Full consensus report context, evidence limits, BMI classification and implementation considerations.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Prepregnancy BMI row
BMI uses measurements from before pregnancy and selects the underweight, normal, overweight or obese row used by the cited guidance.
BMI = prepregnancy weight (kg) ÷ height² (m²)Singleton total and weekly intervals
The cited singleton totals are 28–40, 25–35, 15–25 and 11–20 lb. Second/third-trimester intervals are 1.0–1.3, 0.8–1.0, 0.5–0.7 and 0.4–0.6 lb/week, respectively.
table lookup by prepregnancy BMI categoryTwin evidence boundary
The cited twin totals are 37–54 lb for normal BMI, 31–50 lb for overweight and 25–42 lb for obese. The table establishes no underweight-twin range or twin weekly-rate table, so the tool does not invent either.
Updated: August 2026
Example Scenarios
A 165 cm, 62 kg prepregnancy entry produces BMI 22.8 and retains both the 25–35 lb total and 0.8–1.0 lb/week second/third-trimester interval.
Height: 165 cmPrepregnancy weight: 62 kgType: Singleton
→ Cited total range: 25–35 lb
The twin table returns 37–54 lb total and explicitly says a weekly twin interval is not established in the cited table.
The calculator returns no cited range instead of reusing another BMI row or inventing an unsupported target.
Common Mistakes to Avoid
Common Mistakes to Avoid
Reducing the official weekly interval to one point
Keep the full cited singleton interval and its first-trimester assumption visible.
Inventing an underweight-twin range or twin weekly rate
Return the missing-evidence state and discuss an individualized plan with the prenatal care team.
FAQ
Use prepregnancy measurements. The BMI categories in the cited guidance are based on BMI before pregnancy, not current pregnancy weight.
Underweight 28–40 lb, normal 25–35 lb, overweight 15–25 lb and obese 11–20 lb, with separate second/third-trimester intervals shown in the result.
The cited IOM/ACOG twin table lists ranges only for normal, overweight and obese BMI categories. The calculator preserves that evidence gap.
No. The cited twin summary supplies total ranges but not a twin weekly-rate table, so singleton weekly intervals are not reused.
No. It is a population guideline lookup. Clinical judgment, health history and pregnancy progress can change individualized guidance.
About Pregnancy Weight Gain Calculator
Enter prepregnancy height and weight, then choose singleton or twins. The result preserves the cited range and evidence limits; it is not a personal target or fetal-growth assessment.