How old is your puppy in weeks or months?
Enter an age in weeks or your puppy’s birthday to see the weeks, months, and an approximate human-age comparison. You can jump straight to the matching puppy month guide.
Calculate puppy age in weeks and months See puppy ages by month
Calculate your dog’s age in human years
Puppy ages and milestones by month
A ten-week-old puppy and a ten-month-old puppy have very different needs. Start with your puppy’s age, then explore the right month without sorting through every breed and dog-age page.
Explore puppy ages from 2 to 12 months or read about puppy growth milestones.
How the dog age calculator works
The first two years do a lot of work in the estimate. A one-year-old dog is treated as about 15 human years, and a two-year-old dog is treated as about 24. After that, Puppy Years adds human years at a different pace for small, medium, large, and giant dogs, using breed data when possible and size as the fallback for mixed-breed dogs.
Human years to dog years calculator
Want to go the other way? The reverse calculator lets you enter a human age, choose a dog size group, and see the dog age that lands closest to that human-years estimate.
Dog years are not just seven times your dog’s age
The seven-year rule is easy to remember, but dogs age fastest early in life. Size and breed make the later years more realistic.
| Dog age | Small dog | Medium dog | Large dog | Giant dog |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 |
| 5 | 36 | 39 | 42 | 45 |
| 8 | 48 | 54 | 60 | 66 |
| 12 | 64 | 74 | 84 | 94 |
| 14 | 72 | 84 | 96 | 108 |
More Puppy Years calculators and guides
Puppyhood is just the beginning. These pages cover dog years, breed ages, birthdays, and Lap Day.
Popular breed age guides
Breed pages explain the age estimate in more detail, including size group, life stage, senior age, birthday ideas, name ideas, and related breeds.
Dog age calculator questions
How old is my dog in human years?
Enter your dog’s birthday and breed in the calculator. Puppy Years estimates human years by using age first, then breed size after the first two years.
Is one dog year really seven human years?
No. The seven-year rule is a simple shortcut. It does not account for the fast puppy years or the way size and breed affect aging.
How old is a 13 year old dog in human years?
A 13-year-old dog is about 68 in human years if small, 79 if medium, 90 if large, and 101 if giant using the Puppy Years estimate.
When is a dog considered senior?
Senior age depends on breed size and expected lifespan. Small dogs often reach senior status later than large and giant dogs.
Can I calculate dog years by breed?
Yes. Choose your dog’s breed in the calculator, or open a breed age guide to see a chart and life stage notes for that breed.
Can I use this for a mixed breed dog?
Yes. Choose Mixed Breed / Not Sure, then choose the closest size group. The result will use size instead of a specific breed.