BMI Calculator
Calculate Body Mass Index with metric or imperial units, category, and healthy weight range.
Pregnancy Weight Calculator
Estimate healthy pregnancy weight gain using IOM guidelines by pre-pregnancy BMI.
Introduction
Gestational weight-gain guidance from the Institute of Medicine (IOM) depends on pre-pregnancy BMI. This calculator estimates total recommended gain and an approximate expected range for your current week, then compares it with weight gained so far.
Benefits
- BMI-based IOM ranges
- Week-aware expectations
Educational wellness tool only — not medical advice. Consult a qualified healthcare professional for personal decisions.
How It Works
- Enter week, height, pre-pregnancy weight, and current weight
- Review BMI class and expected gain band
- Discuss results with your clinician
Formula Used
IOM gestational weight-gain guidelines by pre-pregnancy BMI
Examples
Example: Normal BMI, week 20 → expected gain often roughly half of the total IOM range.
Frequently Asked Questions
Do twins use the same ranges?
Multiple pregnancies have different guidelines — use specialist advice.
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