Diaper Calculator: How Many Diapers Will You Need?
Estimate diapers per day and per month, the size to buy next, and your monthly diaper budget.
Select your baby’s age and weight (and optionally the price you pay per diaper) to estimate daily and monthly diaper needs, the size that likely fits, and your monthly budget.
Estimates for general guidance only — every baby is different. Ask your pediatrician about your own child.
Typical diaper use by age
| Age | Diapers per day |
|---|---|
| Newborn (0–1 month) | 10–12 |
| 1–5 months | 8–10 |
| 5–9 months | 7–8 |
| 9–12 months | 6–8 |
| 12–24 months | 5–7 |
Size guide (approximate)
| Size | Weight |
|---|---|
| Newborn | Up to 10 lb (4.5 kg) |
| Size 1 | 8–14 lb (4–6 kg) |
| Size 2 | 12–18 lb (5–8 kg) |
| Size 3 | 16–28 lb (7–13 kg) |
| Size 4 | 22–37 lb (10–17 kg) |
| Size 5+ | 27 lb (12 kg) and up |
Ranges vary by brand. Size up if you see red marks, frequent leaks or blowouts.
Wet diapers as a feeding check
From about day 5, newborns should have at least 6 wet diapers a day. Fewer can be a sign your baby isn’t getting enough milk — call your pediatrician. See our breastfeeding guide for the day-by-day chart, and our diaper rash guide for skin care.