Convert Infant Weights*

Grams - Pounds Conversion

Enter grams: Equals lbs and oz

Pounds - Grams Conversion
Enter lbs: and oz: Equals grams
(Numbers may vary slightly due to rounding.)

Download a printable conversion chart

(PDF software required)

Weight Conversion Chart

Calculate an Approximate Birth Weight Based on Your Gestation*

1.Select a type of multiples:

2. Enter a gestation:

3. Calculate:
Weeks Days


Approx. lbs:

Approx. oz:


To learn much more about the conception, growth and development of multiples, see the following resources:

*Please note: Formulas for the MOST Birth Weight Calculator Tool were created using gestation/weight data tables (as of June 2005) from the MOST Birth Survey. This tool is provided for informational purposes only. Actual birth weights may vary considerably due to factors unique to each pregnancy. MOST cautions visitors NOT to use this tool to make treatment decisions without the guidance of a qualified health care provider.

Updated 5/26/10