Pregnancy · Free Tool
Am I gaining the right amount in pregnancy?
A free, private weight-gain guide from our Accredited Practising Dietitians. Enter a few details to see the healthy gain range for your pre-pregnancy BMI, and whether you’re tracking as expected for your week.
Healthy weight gain in pregnancy varies a lot from person to person, it depends where you started. This free tool, built by our Accredited Practising Dietitians, uses the widely-used Institute of Medicine (IOM) ranges to show a healthy total-gain range for your pre-pregnancy BMI, and where your gain-so-far sits for your current week. It’s a guide for single (not twin) pregnancies, your midwife always sees the bigger picture.
Your pregnancy weight-gain guide
This tracker is a general guide for a single (not twin) pregnancy, based on your pre-pregnancy BMI. It's here to help you follow the conversation with your midwife or GP, not to replace it.
Pre-pregnancy BMI: ()
IOM recommended total gain:
Your gain so far: kg
Expected gain by this week:
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US Institute of Medicine (IOM) 2009 gestational weight-gain guidelines for singleton pregnancies, by pre-pregnancy BMI. The reference used in Australian antenatal care.
Clinical-grade. Private by design.
Built by Accredited Practising Dietitians, and every calculation runs privately in your browser.
It’s the trend that matters, not one reading
A single number on the scales rarely means much on its own. What matters is a steady pattern over time. Most gain happens in the second and third trimesters, at a fairly consistent weekly rate. If your gain looks a little high or low one week, that’s usually nothing, but a sustained change is worth mentioning at your antenatal visit.
Healthy ranges by pre-pregnancy BMI
The IOM recommends different total-gain ranges depending on your BMI before pregnancy: more if you started underweight, less if you started with a higher BMI. This tool does the maths for you. Whatever the number, the goal is a nourishing diet and gentle activity, not a strict target. Our pregnancy dietitians can help you eat well through every trimester.
Frequently asked questions
Where do these ranges come from?
The US Institute of Medicine (IOM) 2009 gestational weight-gain guidelines, which are the reference used in Australian antenatal care. They’re based on your pre-pregnancy BMI and apply to single (not twin) pregnancies.
I’m outside the range, should I worry?
Not on its own. These are guides, not pass/fail lines, and healthy pregnancies happen across a wide range. Use the result as a prompt to chat with your midwife or GP, who interpret it alongside your whole pregnancy.
Does this work for twins?
No, twin and multiple pregnancies have different (higher) recommended ranges. This tool is for single pregnancies. Your maternity team will guide you if you’re expecting more than one.
Is my information private?
Yes. Everything is calculated in your browser, your details are never sent or stored. Only anonymous, aggregate usage is recorded.
Can Ausclin help with pregnancy nutrition?
Absolutely, from nausea and gestational diabetes to healthy gain and postpartum recovery. Get in touch or book online.