Pregnancy Weight Gain Calculator

See the recommended total pregnancy weight-gain range for your pre-pregnancy BMI, and what is expected by your current week.

Read the guide: How Much Weight to Gain in Pregnancy

Before pregnancy

Units

Recommended total gain

11.5 kg – 16 kg

Pre-pregnancy BMI 22.8 · Normal

Expected by week 20
3 kg – 5.5 kg
BMI category
Normal

Based on Institute of Medicine guidelines for a single baby. Your clinician's advice comes first. Informational only, not medical advice.

How it works

  1. 1

    Enter your starting point

    Add your pre-pregnancy weight and height.

  2. 2

    Add your current week

    Enter how many weeks pregnant you are now.

  3. 3

    See the ranges

    View the recommended total gain and the expected range so far.

Instant & 100% private — nothing is uploaded

Every calculation runs locally in your browser. The measurements, dates and details you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.

Frequently asked questions

How much weight should I gain?
It depends on your pre-pregnancy BMI. The Institute of Medicine suggests about 11.5–16 kg for a normal BMI, more if underweight and less if overweight or obese.
Is gaining outside the range a problem?
Not necessarily on its own, but your clinician monitors gain alongside other factors. These are general guidelines for a single baby, not personal advice.
Is this medical advice?
No. These calculators are for general information and education only. They are not a diagnosis or a substitute for professional care — talk to a doctor or qualified clinician about your health.