Pregnancy Weight Gain Calculator

Calculate pre-pregnancy BMI and reference gain ranges for one baby or twins using IOM and CDC sources. Metric or imperial units and optional local exportable tracking.

Pre-pregnancy detailsPre-pregnancy BMI determines the reference range for total gain.

Unit system

Height

Pre-pregnancy weight

Current weight

Current pregnancy week

Pregnancy type

Measurement date

Optional private trackingSaving is optional and stays in this browser, without encryption. Other users of this device may see it.

Reference total gain range—Based on pre-pregnancy BMI—

BMI category—

Gain so far—

End-of-pregnancy weight range—

Entered pregnancy week—

IOM 2009 kilogram ranges; twin ranges are provisional. Underweight twins use CDC’s 50–62 lb exception. Conversions are exact and display is rounded.

0—

The band represents the total pregnancy range, not a diagnostic weekly target.

Local historyNo saved measurements

Guidance range, not a diagnosisYour healthcare professional may set a different goal based on your health and pregnancy. For triplets or more, use an individualized care plan.

Weight-gain reference ↗

All dates are Gregorian. Calculations run in your browser without sending your data.

IOM 2009 ↗

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