Diaper Calculator

The Diaper Calculator below let's you input your estimated baby's weight and the number of children (for multiples) to find out how many diapers you will need for the first year. We've taken the average growth rate of a child and determined the size and count of diapers per week to provide a total of what you can expect for the first year (give or take).

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Diaper Baby

Diaper Sizes


(Up to 10 lb) - For small or average-sized newborn infants.

Size 1

(8-14 lb) - For larger newborns and infants up to 3 months old.

Size 2

(12-18 lb) - For infants from 2 to
6 months old.

Size 3

(16-28 lb) - For infants and toddlers from 5 months to 2 years old.

First Year Average Diapers Per Day

  • 0-3 Months up to ~10/day
  • 3-6 Months up to ~7/day
  • 6-11 Months up to ~5/day