Diaper Size Calculator

Find the perfect diaper size for your baby with weight/age-based recommendations.

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Baby Age (months)

Recommended size: -

Weight range: -

Fit tip: -

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Size	Weight (lbs)	Weight (kg)	Age Guide	Fit Tip
Newborn	Up to 10	Up to 4.5	0-1 months	Best for first weeks.
1	8-14	3.6-6.4	0-4 months	Common first regular size.
2	12-18	5.4-8.2	3-8 months	Use if Size 1 leaves marks.
3	16-28	7.3-12.7	5-24 months	Great for active babies.
4	22-37	10.0-16.8	18-36 months	Good for stronger absorbency.
5	27-45	12.2-20.4	24+ months	Roomier fit for toddlers.
6	35-55	15.9-24.9	30+ months	For bigger toddlers.
Plus (4+)	38-46	17.2-20.9	Toddler	Wider fit than regular.
Plus (5+)	46-57	20.9-25.9	Toddler+	Extra room and absorbency.
Plus (6+)	57+	25.9+	Toddler+	Largest diaper-style fit.

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Find the perfect diaper size for your baby with weight/age-based recommendations.

Baby Weight Weight Unit Baby Age (months)

Recommended size: -

Weight range: -

Fit tip: -

Calculated successfully. Always check baby's comfort and fit.

Size	Approx Weight (lbs)	Approx Weight (kg)	General Age Guide	Fit Tip
Newborn	Up to 10	Up to 4.5	0-1 months	Use for first weeks if baby's weight fits.
1	8-14	3.6-6.4	0-4 months	Common first size after newborn.
2	12-18	5.4-8.2	3-8 months	Good when Size 1 leaves marks.
3	16-28	7.3-12.7	5-24 months	Popular size for active babies.
4	22-37	10.0-16.8	18-36 months	Move up if frequent leaks occur.
5	27+	12.2+	24+ months	For toddlers needing more room.
6	35+	15.9+	36+ months	Larger fit for older toddlers.
7	41+	18.6+	40+ months	Extended sizing for bigger toddlers.
Plus (4+)	38+	17.2+	Toddler	Wider fit option when regular size is tight.
Plus (5+)	46+	20.9+	Toddler	Extra room and absorbency for larger builds.
Plus (6+)	57+	25.9+	Toddler+	Maximum room in diaper-style fit.