Diaper Size Calculator

Diaper Size Calculator by Weight

Not sure which diaper size to buy? Enter your baby’s weight to see the typical size (sizes overlap between brands).

Diaper sizes vary by brand — always check the weight range on the package. This tool gives a general starting point only.
Diapering: shop cloth diapers, diaper bags, changing pads & wipe warmers. See our cheapest diapers in Canada guide.
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Diaper sizes by weight

Sizes are set by weight, not age, and overlap between brands: Newborn (up to ~4.5 kg), Size 1 (4–6 kg), Size 2 (5.5–8 kg), Size 3 (7–13 kg), Size 4 (10–17 kg), Size 5 (13–27 kg), Size 6 (16 kg+). If you see leaks or red marks, move up a size.