Pregnancy Weight Gain Range Calculator (by BMI Band)
Uses your pre-pregnancy BMI to give the healthy total weight gain range for a full-term pregnancy and a weekly rate for the current trimester.
Recent
Formula
How the calculation works
The tool reads your pre-pregnancy BMI and places it in one of four bands, from underweight to obese.
It returns the total weight gain range that medical guidance sets for that band over the whole pregnancy.
It also gives a weekly rate drawn from that range, with only a small gain expected in the first trimester.
Common mistakes
- Using your current weight to find the BMI, when the range is set from the weight you had before pregnancy.
- Trying to lose weight during pregnancy, which is unsafe unless a doctor supervises it for a specific medical reason.
When to use it
- Check whether your weight gain so far is inside the range your BMI band allows.
- Discuss a realistic gain target with your doctor when you start pregnancy above or below the normal BMI.
Worked example
A pre-pregnancy BMI of 22 falls in the normal band, so the healthy total gain is 11.5 to 16 kg, at a weekly rate of about 0.4 kg in the later months.
Common questions
Why is the target based on BMI and not on a single weight?
Healthy gain depends on your starting body size, so a lower BMI band allows more gain and a higher band allows less.
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