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Pregnancy Weight Gain Calculator

Health & Body

Recommended gain vs actual — IOM guidelines

Quick Answer

Pregnancy Weight Gain Calculator: Recommended gain vs actual — IOM guidelines. Pregnancy Weight Gain Calculator uses standard health formulas to compute accurate results instantly.

IOM recommended total gain

11.5 ~ 16 kg

Pre-BMI 21.5 (normal) · gained 3.0kg at wk20 → On track

Pre-pregnancy BMI21.5
Gained so far3.0kg
Expected by now2.8~5.4kg
Remaining budget13.0kg

Total gain vs IOM range

Too little
Ideal
Excess

3.0kg @ wk20

Steps

  1. 1Pre-BMI = 55 ÷ (1.6)² = 21.5 → normal category
  2. 2IOM 2009 for normal: total 11.5-16kg
  3. 3Pace: 1st trimester 0.5-2kg total, then ~0.4kg/wk
  4. 4At wk20 expected 2.8-5.4kg; actual 3.0kg → On track

IOM 2009 table (singleton)

Pre-BMICategoryTotal gainWeekly (2nd/3rd tri)
0-18.5underweight12.5-18kg0.42-0.59kg
18.5-25 ←normal11.5-16kg0.33-0.48kg
25-30overweight7-11.5kg0.23-0.48kg
30-40+obese5-9kg0.23-0.32kg

💡 Twins roughly double the budget: normal-BMI twins target 16.8-24.5kg. Gaining too little raises low-birthweight risk; too much raises gestational diabetes and C-section odds. Second/third trimester needs only ~300-450 extra kcal/day — "eating for two" is a myth.

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How to Use

  1. Enter body metrics: fill height, weight, age etc. as prompted by the Pregnancy Weight Gain Calculator.
  2. Read value and grade: results appear instantly with an authority-based classification.
  3. Check reference tables: confirm your range and healthy targets against the tables on this page.
  4. Back-solve your goal: adjust inputs to see what it takes to reach a target.

Key Points

  • Pregnancy Weight Gain Calculator is a free online health tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Recommended gain vs actual — IOM guidelines.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Pregnancy Weight Gain Calculator formula

Pregnancy Weight Gain Calculator uses standard health formulas to compute accurate results instantly.

FAQ

How do I use the Pregnancy Weight Gain Calculator?
Open the page and fill in the input fields — results update automatically. Recommended gain vs actual — IOM guidelines.
Are the results accurate?
Results follow published international standards (WHO, ACE, IOM) and are for reference only.
Can this replace medical advice?
No. Always consult a qualified healthcare professional for health decisions.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on all devices.

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Source & Updates

Based on WHO, ACE, IOM and other published international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Pregnancy Weight Gain Calculator[EB/OL]. https://www.yijiansuan.com/en/c/health/pregnancy-weight

Results provided by this tool are for reference only and do not constitute professional advice.