Diaper Size Calculator
Pick your brand, enter baby's weight, and find the perfect diaper size. Compare Pampers, Huggies, Luvs, Kirkland, and more across US and UK/EU sizing.
Find the perfect fit
What size diaper does baby need?
9 sizes available · Premium
Enter your baby's current weight in pounds
The perfect fit awaits
Select your brand and enter baby's weight to see the recommended diaper size
Pampers Swaddlers Size Chart
Premium option
Brand Comparison
Which sizes each US brand carries
| Brand | Preemie | Newborn | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
|---|---|---|---|---|---|---|---|---|---|---|
| Pampers Swaddlers | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Pampers Baby Dry | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Pampers Cruisers 360 | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Huggies Little Snugglers | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Huggies Little Movers | — | — | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Luvs | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Kirkland Signature (Costco) | — | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
| Up & Up (Target) | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Parent's Choice (Walmart) | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| Honest Company | — | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — | — |
When should I size up?
If you notice frequent blowouts, red marks on baby's skin, or difficulty fastening the tabs, it's probably time to move up a size.
Why do sizes vary by brand?
Each brand designs diapers with different fits, materials, and elasticity. A Size 3 in one brand might fit differently than another. That's why we show brand-specific charts.
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