Pregnancy weight gain calculator tool showing healthy weight range
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Pregnancy Weight Gain Tracker - Free Tool | Healthtus
Healthtus Health Tool

Pregnancy Weight Tracker (Gain Calculator)

Track your pregnancy weight gain with our free, evidence-based calculator. Enter your pre-pregnancy weight, height, current weight, and weeks pregnant to get personalized recommendations based on your BMI and pregnancy type. Our tool follows IOM (Institute of Medicine) guidelines to help you stay on track for a healthy pregnancy.

100% Free No Registration Instant Results Privacy First IOM Guidelines
Track Your Progress

Pregnancy Weight Tracker

Please enter a valid weight.
Please enter a valid height.
Please enter a valid weight.
Please enter a valid week (1–42).

Your Weight Tracking Results

Your results will appear here.
Pre-Pregnancy BMI
--
Recommended Gain
Your Current Gain
--
Target Gain for Today
--
On Track

What This Means

Complete the form and click "Track My Progress" to see personalized insights about your pregnancy weight gain.

How to Use the Tool

1. Enter your details

Pre-pregnancy weight, height, current weight & weeks.

2. Select preferences

Unit system & pregnancy type (single/twins).

3. Get insights

BMI, recommended gain, chart & personalized advice.

How It's Calculated

Key Formulas

  • BMI: Weight (kg) / Height (m)²
  • Current Gain: Current Weight − Pre-Pregnancy Weight
  • Target Range: IOM recommendations based on BMI

IOM Guidelines

  • Underweight (<18.5): 12.5–18 kg
  • Normal (18.5–24.9): 11.5–16 kg
  • Overweight (25–29.9): 7–11.5 kg
  • Obese (≥30): 5–9 kg
Worked example: Pre-pregnancy weight = 65 kg, Height = 165 cm (1.65 m) → BMI = 65 / (1.65)² = 23.9 (Normal). Recommended gain: 11.5–16 kg. At 20 weeks, target gain ≈ 6.5–9.5 kg.

About Pregnancy Weight Gain

Why Track Weight Gain?

Healthy weight gain during pregnancy is important for your baby's growth and development. The Institute of Medicine (IOM) provides evidence-based guidelines for weight gain based on your pre-pregnancy BMI. Gaining within the recommended range reduces the risk of complications for both mother and baby.

Key Facts:

  • First Trimester: ~1–2 kg total gain
  • Second Trimester: ~0.4–0.5 kg per week
  • Third Trimester: ~0.4–0.5 kg per week
  • Twins: Higher recommended ranges

Limitations of This Tool

  • Provides estimates based on IOM guidelines — individual needs may vary.
  • Does not account for fluid retention, muscle mass, or other health conditions.
  • Not a substitute for professional medical advice or personalized prenatal care.
  • Always consult your healthcare provider for personalized weight gain guidance.

Trust & Privacy

Your data stays in your browser. All calculations happen locally. We never send your data to any server.

No registration or login required. Your privacy is 100% protected.

Uses IOM (Institute of Medicine) guidelines. Our tool follows established medical standards.

No cookies used for tracking. Your history is stored locally in your browser's localStorage.

IOM Guidelines
Data stays in your browser
No registration needed
Mobile-friendly
Updated frequently
Completely free

Real-World Examples

Example 1

Pre-weight: 65 kg, Height: 165 cm, Week: 20

BMI: 23.9 → Normal Range

Example 2

Pre-weight: 80 kg, Height: 170 cm, Week: 28

BMI: 27.7 → Overweight

Example 3

Pre-weight: 55 kg, Height: 162 cm, Week: 12, Twins

BMI: 21.0 → Normal (Twins)

Frequently Asked Questions

The recommended weight gain depends on your pre-pregnancy BMI. Underweight women (BMI < 18.5) should gain 12.5–18 kg, normal weight (18.5–24.9) 11.5–16 kg, overweight (25–29.9) 7–11.5 kg, and obese (≥30) 5–9 kg. For twins, the ranges are higher.
This calculator follows IOM guidelines and provides reliable estimates. However, individual needs may vary. Always consult your healthcare provider for personalized advice.
The calculator includes a "Twins" option that uses higher recommended weight gain ranges. For twins, underweight/normal women should gain 17–25 kg, overweight 14–23 kg, and obese 11–19 kg.
It's common to gain slightly outside the range. However, significant deviations may increase the risk of complications. Discuss your weight gain with your healthcare provider for personalized guidance.
Your data is stored locally in your browser's localStorage. It is not sent to any server or stored by Healthtus. You can clear your history at any time.
Our team reviews and updates the tool regularly, with the latest review completed in July 2026.

References

  • Institute of Medicine (IOM). Weight Gain During Pregnancy: Reexamining the Guidelines. nap.edu
  • American College of Obstetricians and Gynecologists. Weight Gain During Pregnancy. acog.org
  • World Health Organization. BMI Classification. who.int

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Your History

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Editorial & Medical Review

Reviewed by: Healthtus Editorial Team
Credentials: Evidence-based, IOM guidelines
Last Updated: July 2026
Sources: IOM, ACOG, WHO
Editorial Policy: Read our policy

Pregnancy Weight Gain Calculator

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