How old is your dog in human years? Pick dog or cat, choose the adult size and enter the age. You get the human age, the life stage, and what to watch for at that stage.
Based on the size-based age chart published by the American Animal Hospital Association (AAHA). Every pet ages a little differently, so treat this as a guide.
Why “1 dog year = 7 human years” is wrong
Dogs grow up very fast: a 1-year-old dog is about as mature as a 15-year-old person, and a 2-year-old is close to 24. After that, ageing slows down, and the speed depends on size. Small dogs age slowly and live longer; large and giant breeds age faster. That is why the calculator asks for your dog’s adult size.
Dog age chart by size
| Dog age | Small (up to 9 kg) | Medium (10–23 kg) | Large (23–41 kg) | Giant (over 41 kg) |
|---|---|---|---|---|
| 1 year | 15 | 15 | 15 | 15 |
| 2 years | 24 | 24 | 24 | 24 |
| 3 years | 28 | 28 | 30 | 32 |
| 4 years | 32 | 33 | 35 | 37 |
| 5 years | 36 | 37 | 40 | 42 |
| 6 years | 40 | 42 | 45 | 49 |
| 7 years | 44 | 47 | 50 | 56 |
| 8 years | 48 | 51 | 55 | 64 |
| 9 years | 52 | 56 | 61 | 71 |
| 10 years | 56 | 60 | 66 | 78 |
| 11 years | 60 | 65 | 72 | 86 |
| 12 years | 64 | 69 | 77 | 93 |
| 13 years | 68 | 74 | 82 | 101 |
| 14 years | 72 | 78 | 88 | 108 |
| 15 years | 76 | 83 | 93 | 115 |
| 16 years | 80 | 87 | 99 | 123 |
Indian examples: small – Shih Tzu, Pug, Pomeranian; medium – Beagle, Indian Pariah (indie) dog; large – Labrador, Golden Retriever, German Shepherd; giant – Great Dane, Saint Bernard, Mastiff.
Cat age chart
| Cat age | Human age |
|---|---|
| 1 year | 15 |
| 2 years | 24 |
| 3 years | 28 |
| 5 years | 36 |
| 7 years | 44 |
| 10 years | 56 |
| 12 years | 64 |
| 15 years | 76 |
| 18 years | 88 |
When is a dog a senior?
As a rough guide: small dogs from about 10 years, medium dogs from 8, large dogs from 7 and giant dogs from 6. Cats are usually called senior from about 10 years.
- Book a vet check-up every 6 months, with blood tests when your vet advises.
- Watch for stiffness, slow walks, trouble on stairs, weight change, or drinking more water, and mention them to your vet.
- Keep weight in check, use soft bedding and non-slip floors, and take shorter, more frequent walks.
For older dogs, see Glumaxx joint support or the Senior Joint Care Kit. Got a new puppy? Use our puppy vaccination schedule tool.
Frequently asked questions
How old is a 1-year-old dog in human years?
About 15 human years, for dogs of every size.
How old is a 10-year-old dog in human years?
About 56 for a small dog, 60 for a medium dog, 66 for a large dog and 78 for a giant dog.
Is a 7-year-old dog old?
A 7-year-old large dog such as a Labrador is entering its senior years. A small dog of the same age is still a mature adult.
How do I work out my cat’s age in human years?
The first year equals about 15 human years, the second adds about 9 more (24), and each year after that adds about 4.
Based on the size-based age chart published with the American Animal Hospital Association (AAHA) senior care guidance. Every pet ages a little differently, so treat this as a guide.
More free tools: Puppy & kitten vaccination schedule · Milk feeding calculator · Supplement Finder
