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ANTENATAL MNT TOOL · IOM 2009 GUIDELINES · INDIAN BMI ADAPTATION · NIN/ICMR · ACOG ENDORSED

Pregnancy Weight
Gain Calculator.

BMI-stratified gestational weight gain targets, week-by-week tracking, trimester breakdown, and Indian-adapted NIN/ICMR guidance. Built on IOM 2009 — the global standard for antenatal weight management.

IOM 2009 — Global Antenatal Standard
Indian BMI Cutoffs — ICMR/WHO Asia-Pacific
Week-by-Week Tracking + Visual Chart
NIN/ICMR India-Specific MNT Guidance

Calculate Gestational Weight Gain

IOM 2009 · Indian BMI adaptation · Week-by-week targets · Status tracking

This calculator uses IOM 2009 guidelines, the global standard endorsed by ACOG, FIGO, and WHO. It is a clinical support tool — not a substitute for individualised antenatal dietitian or obstetrician advice. For women with gestational diabetes, pre-eclampsia, or multiple gestation, targets should be discussed with your clinical team.
Pre-Pregnancy Height and Weight * Used to calculate pre-pregnancy BMI and select the correct IOM 2009 GWG category. If pre-pregnancy weight is unknown, use weight at first antenatal visit (before 10 weeks). BMI auto-calculated.
Current Gestational Age and Weight * Current weight and gestational age together determine actual GWG and compare against the IOM week-specific reference band. Gestational age from LMP or confirmed ultrasound (ACOG CO 700).
BMI Classification Standard * Indian/Asian women have higher body fat percentage at lower BMI (the thin-fat phenotype — Yajnik et al., Pune Birth Cohort). WHO Asia-Pacific and ICMR recommend lower cutoffs: overweight at BMI 23+, obese at BMI 27.5+. Reclassifying shifts the IOM GWG target to a more appropriate category.
Pregnancy Type * Twin pregnancies require higher GWG targets — IOM 2009 provisional recommendations: Normal BMI 17–25 kg, Overweight 14–23 kg, Obese 11–19 kg. Triplets/higher: no guideline available — clinical judgement required.
Parity (prior births) For clinical context and counselling. Parity itself does not change IOM GWG targets, but affects baseline weight distribution and counselling approach. Multiparous women tend to gain weight differently — useful context for dietitians.

IOM 2009 (doi:10.17226/12584) · ACOG CO 548 · FIGO 2020 · NIN/ICMR 2024 · Gilmore and Redman 2015

CURRENT GWG STATUS
Enter details
Gained
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kg so far
Target range
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min – max kg
Still to gain
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kg to term

ANTENATAL NUTRITION SUPPORT

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Week-by-week weight monitoring, GDM prevention, and personalised Indian meal plans from our antenatal specialist dietitians.

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WHAT THIS CALCULATOR GIVES YOU

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GWG Status — On Track / Above / BelowReal-time comparison against IOM 2009 week-specific bands
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Visual Weight Gain ChartYour actual gain overlaid on IOM reference bands
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Week 1–40 Target TableExact min/mean/max GWG at every gestational week
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Indian BMI AdaptationICMR/WHO Asia-Pacific cutoffs for Indian thin-fat phenotype
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Trimester Nutrition TargetsICMR-NIN 2020 extra calorie and nutrient guidance

CLINICAL REFERENCES

IOM (2009)Weight Gain During Pregnancy. National Academies Press. doi:10.17226/12584
ACOG CO 548 (2013)Weight Gain During Pregnancy — endorses IOM 2009
FIGO (2020)Recommendations on obesity in pregnancy — GWG 5–9 kg for obese women
NIN/ICMR (2024)Dietary Guidelines for Indians — Pregnancy Module
Gilmore and Redman (2015)IOM 2009 week-by-week GWG model. Obesity 23(3):507

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This calculator uses IOM 2009 gestational weight gain guidelines, the global standard endorsed by ACOG, FIGO, and WHO. Indian BMI adaptation follows ICMR and WHO Asia-Pacific cutoffs. Outputs are population-level statistical targets — individual GWG may need to be modified for gestational diabetes, preeclampsia, multiple gestation, severe obesity, or other clinical conditions. Always confirm targets and manage antenatal weight with your obstetrician, midwife, or registered antenatal dietitian.