Dog Age Calculator
Input your dog's age and size to accurately convert to human years, and see which life stage they are in. Supports Small Dogs (up to 10kg), Medium Dogs (10-25kg), Large Dogs (25-45kg) and Giant Dogs (45kg+). All calculations are performed in your browser - no data is uploaded to servers.
Input Dog Information
Select dog size and enter age, then click calculate.
Size Reference Table
Typical weight ranges for different dog sizes.
| Size | Weight Range | Typical Breeds | Avg Lifespan |
|---|---|---|---|
| Small | up to 10kg | Chihuahua, Pomeranian, Yorkshire Terrier | 12-16 years |
| Medium | 10 - 25kg | Corgi, French Bulldog, Shiba Inu | 11-14 years |
| Large | 25 - 45kg | Golden Retriever, German Shepherd, Labrador | 10-13 years |
| Giant | 45kg+ | Great Dane, Saint Bernard, Mastiff | 8-10 years |
Frequently Asked Questions
A dog's first year is roughly equivalent to 15 human years, the second year equals about 9 human years, and each subsequent year equals about 4-5 human years. The exact conversion depends on the dog's size - smaller dogs age more slowly while larger dogs age faster.
Large and giant breed dogs grow at faster rates and have different metabolic rates. Their cells age more quickly, which is why large dogs of the same age are physiologically older than small dogs and tend to have shorter lifespans.
General guidelines: 0-2 years is puppyhood (equivalent to human infant through teenage years); 2-6 years is adulthood; 6-10 years is middle age; 10+ years is senior. There are slight variations depending on size.
A 7-year-old dog is equivalent to middle age, roughly 44-55 in human years. For large and giant breeds, 7 is approaching early senior years, while small dogs are still in late adulthood. Regular vet checkups are recommended.