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Puppy age calculator
Enter your puppy's date of birth to see exactly how old it is in weeks, days and months.
Your puppy's age in weeks, months and days will show here.
Last reviewed October 7, 2026.
Puppy weeks to months chart
A month has about 4.33 weeks on average (52 weeks ÷ 12 months), so "12 weeks" is closer to 2.8 months than 3. This chart rounds to one decimal place.
| Weeks | Months | Weeks | Months |
|---|---|---|---|
| 4 | 0.9 | 20 | 4.6 |
| 6 | 1.4 | 24 | 5.5 |
| 8 | 1.8 | 26 | 6.0 |
| 10 | 2.3 | 30 | 6.9 |
| 12 | 2.8 | 36 | 8.3 |
| 14 | 3.2 | 40 | 9.2 |
| 16 | 3.7 | 44 | 10.2 |
| 18 | 4.2 | 52 | 12.0 |
Why puppy age is counted in weeks
Puppies change so fast in their first months that a few weeks make a real difference. Vets plan vaccinations, deworming and check-ups by week, and breeders and shelters usually give a puppy's age in weeks. Once a dog is past about six months, months are usually precise enough.
How the calculator works
The calculator counts the days between your puppy's birthday and today. Weeks are whole weeks plus leftover days. Months are whole calendar months plus leftover days, so a puppy born on the 10th turns one month old on the 10th of the next month. The decimal months figure divides the days by the average month length of 30.44 days.
Questions people ask
How many months is 8 weeks for a puppy?
About 1.8 months. A month averages 4.33 weeks, so 8 weeks is a little under 2 months.
How many months is 12 weeks?
About 2.8 months. Many people round it to 3 months.
How many weeks is 6 months?
About 26 weeks.
How do I find my puppy's age if I don't know its birthday?
Your vet can estimate a puppy's age, mainly from its teeth. Use their estimate as the date of birth here.
How old is my puppy in human years?
Use the dog age calculator. The first year of a dog's life equals about 15 human years.