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.

See the recommended pregnancy weight gain for your pre-pregnancy BMI, and how much gain is expected by your current week. This pregnancy weight gain calculator follows the Institute of Medicine ranges, so you can check whether your gain is on track for a single baby.

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 to 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.
When does most pregnancy weight gain happen?
Gain is usually slow in the first trimester, often just a kilo or two, then picks up through the second and third trimesters as the baby grows. The weekly ranges here reflect that pattern.

Important

These calculators give general, informational estimates and are not medical advice, diagnosis or treatment. Everyone is different — for decisions about your health, talk to a qualified clinician.

More tools

BMI CalculatorBody mass index, your category and a healthy weight range.Body Fat CalculatorBody fat percentage from the US Navy measurement method.Ideal Weight CalculatorA healthy target weight range for your height.Lean Body Mass CalculatorLean (fat-free) mass and fat mass from height and weight.Waist-to-Hip Ratio CalculatorWaist-to-hip ratio and your WHO health-risk band.BMR CalculatorCalories your body burns at rest (Mifflin-St Jeor).

More from the Hivly network

Free sister tools on our other sites.

Length ConverterMetres, feet, miles, inches, km and more, instantly.Cups to Grams ConverterFlour, sugar, butter and more — cups to grams, done right.Age CalculatorExact age in years, months and days, plus your next birthday.