Diaper Calculator

How many diapers will my baby use?

Find out how many diapers your baby needs based on their weight. See sizes, daily usage, and total estimates.

Quick answer: how many diapers do I need? Newborns use about 8–10 diapers a day, babies from 2 to 11 months about 6, and toddlers about 5 — roughly 6,000 to 8,000 from birth to potty training. Enter your baby's weight below to see how many you still need in each size.
5.0kg
2 kg16 kg

Total Diapers Remaining

3,930

diapers

Size Breakdown

Newborn (NB)

Passed
0 - 3.5 kg8 per day

Small (S)

Passed
3.5 - 5 kg8 per day

Medium (M)

Current Size
5 - 9 kg6 per day
~1,080 remaining

Large (L)

Future Size
9 - 12 kg5 per day
~450 diapers

XL (XL)

Future Size
12 - 15 kg5 per day
~450 diapers

XXL (XXL)

Future Size
15 - 28 kg5 per day
~1,950 diapers
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How Many Diapers Does a Baby Need?

On average, a baby will use between 6,000 and 8,000 diapers from birth until potty training (around 2-3 years old). The exact number depends on your baby's weight gain pattern, diaper size changes, and when they start potty training.

Newborns typically need 8-10 diaper changes per day, while older babies may need 5-6 changes. This calculator estimates the total number of diapers remaining based on your baby's current weight and standard size charts.

How Many Diapers a Day, by Age and Size

Diaper sizes follow weight, so the ages below are typical, based on the WHO median weight for each age. A baby who is bigger or smaller than average moves up sooner or later.

Typical ageSizeWeightDiapers per dayPer month
Birth to ~1 monthNewborn (NB)Up to 3.5 kg (7.7 lb)8–10~250–300
1–2 monthsSmall (S)3.5–5 kg (7.7–11 lb)~8~240
2–11 monthsMedium (M)5–9 kg (11–20 lb)~6~180
11–24 monthsLarge (L)9–12 kg (20–26 lb)~5~150
2–3 yearsXL12–15 kg (26–33 lb)~5~150
3 years to potty trainingXXL15 kg+ (33 lb+)4–5~120–150

So a 15-month-old typically uses about 5 diapers a day, roughly 150 a month. From birth to potty training, most babies go through 6,000 to 8,000 diapers in total.

Diaper Size Guide

Diaper sizes are based on baby weight, not age. Here's a general guide:

  • Newborn (NB): Up to 3.5 kg — typically used for the first 2-4 weeks
  • Small (S/P): 3.5-5 kg — usually fits from 1-2 months
  • Medium (M): 5-9 kg — the most-used size, lasting several months
  • Large (L/G): 9-12 kg — common from around 11 months into the second year
  • XL (XG): 12-15 kg — for older babies and early toddlers
  • XXL (XXG): 15+ kg — for toddlers until potty training

Tips for Saving on Diapers

Buy in bulk when you find a good price, but don't stock up too many of one size — babies grow quickly! Medium (M) is the safest size to stock up on, as babies spend the longest time in this size. Watch for sales and consider subscribing to regular deliveries for automatic discounts.

Frequently Asked Questions

How many diapers do I need for a newborn?
Plan on 8–10 diapers a day, about 250–300 in the first month. Newborn-size diapers only last 2–4 weeks for most babies, so buy one or two packs of newborn and more of size 1 (small).
Is 7 diapers a day enough?
For most babies, yes. After the first week, a newborn should have at least 6 wet diapers a day, which is a good sign they're feeding well; 7 is within that range. Older babies usually need 5–6 changes a day. If a newborn has fewer than 6 wet diapers a day after day 5, call your pediatrician.
How many diapers does a 15-month-old use a day?
About 5 a day, roughly 150 a month. At that age most babies wear size 3 or 4 (large), since diaper sizes follow weight, not age.
How many diapers from birth to potty training?
Most babies use 6,000 to 8,000 diapers from birth until potty training, which usually happens between 2 and 3 years old. The calculator above estimates how many your baby still needs from their current weight.
How do I know when to move up a diaper size?
Signs it's time to size up include frequent leaks or blowouts, red marks on your baby's thighs or waist, trouble fastening the tabs, and a diaper that looks too snug. It's better to size up a little early than to deal with leaks.

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