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ARVENRA
Pregnancy & reproductive health

Pregnancy Weight Gain Calculator

The recommended gain range from the IOM guidelines and your pre-pregnancy BMI.

The recommended range depends on your pre-pregnancy body mass index. Alongside the total range, the tool works out a target for the week you are in.

Your details

Typical range: 30 – 250

Typical range: 120 – 220

Typical range: 30 – 300

Typical range: 0 – 45

The values you enter are calculated in your browser only — nothing is stored or transmitted.

Fill in your details and press calculate — your result will appear here.

Formula and method

The Institute of Medicine's 2009 guideline ranges. The target to date is the first-trimester allowance plus the weekly rate for the weeks after week 13.

Formula used

IOM 2009 gestational weight gain ranges by pre-pregnancy BMI

Assumptions and limits

  • For an underweight twin pregnancy the IOM gives no recommendation, and the tool reports exactly that.
  • Weight gain in pregnancy should be monitored by your care team; this tool does not replace that.

Scientific sources

  1. Institute of Medicine and National Research Council. Weight Gain During Pregnancy: Reexamining the Guidelines. National Academies Press, Washington DC, 2009.

    View source

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