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Pregnancy Weight Gain Calculator

IOM & ACOG Clinical Gestational Guidance

Pregnancy Weight Gain Calculator

Monitor and track healthy gestational weight gain week-by-week. Custom targeting models based on pre-pregnancy BMI for singleton and twin pregnancies.

Scenarios:

Physical Profiles

ft
in
lbs
weeks
lbs

Pre-Pregnancy BMI

22.3 (Normal Weight)

Within Recommended Range

Target Gain for Week 20

7.5 lbs – 12.4 lbs

Your Actual Gain

10 lbs

Total Delivery Target

25 lbs – 35 lbs

Min Target (7.5 lbs)Max Target (12.4 lbs)

Gestational Gain Trajectory Curve

W0W12W20W28W40032
Target Range BandYour Current Gain (10 lbs)

Week-by-Week Cumulative Target Ledger

Gestation WeekMin Cumulative GainMax Cumulative Gain
Week 00 lbs0 lbs
Week 20.2 lbs0.7 lbs
Week 40.4 lbs1.5 lbs
Week 60.6 lbs2.2 lbs
Week 80.7 lbs2.9 lbs
Week 100.9 lbs3.7 lbs
Week 121.1 lbs4.4 lbs
Week 142.7 lbs6.4 lbs
Week 164.3 lbs8.4 lbs
Week 185.9 lbs10.4 lbs
Week 20ACTIVE7.5 lbs12.4 lbs
Week 229.1 lbs14.4 lbs
Week 2410.7 lbs16.4 lbs
Week 2612.3 lbs18.4 lbs
Week 2813.9 lbs20.4 lbs
Week 3015.5 lbs22.4 lbs
Week 3217.1 lbs24.4 lbs
Week 3418.7 lbs26.4 lbs
Week 3620.3 lbs28.4 lbs
Week 3821.9 lbs30.4 lbs
Week 4023.5 lbs32.4 lbs

Related Calculators

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Frequently Asked Questions
How is pre-pregnancy BMI used to determine pregnancy weight gain targets?β–Ύ
Medical guidelines from the Institute of Medicine (IOM) utilize your pre-pregnancy Body Mass Index (BMI) to categorize your weight status (underweight, normal weight, overweight, or obese). Since baseline energy stores and metabolic settings differ, each weight status category is assigned a customized total healthy weight gain range and weekly rate target.
Are the weight gain guidelines different for twins or multiples?β–Ύ
Yes. Carrying twins places significantly higher nutritional, physiological, and volume demands on the maternal body. The recommended weight gain limits are higher across all BMI categories to support the proper growth and development of both babies and reduce early delivery risks.
What should I do if my weight gain is outside the recommended targets?β–Ύ
The week-by-week curve is an estimation reference tool. Minor fluctuations are completely normal. If your actual gain is consistently below or above the green shaded band, speak with your healthcare provider or dietitian to review nutritional requirements, activity levels, and gestational progress.

How Weight Gain Calculator Works

Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Pregnancy Calculator and Health Hub utilities.

Enter Pre-Pregnancy BMI

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Select Trimester

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Get Gain Range

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

IOM Guidelines

Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:

Underweight

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Normal Weight

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Overweight

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Twin Pregnancy

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Frequently Asked Questions About Pregnancy Weight

Is this weight gain calculator free?

Yes. Track pregnancy weight gain with no registration.

Which guidelines are used?

Institute of Medicine (IOM) pregnancy weight gain guidelines.