Dog Age Calculator (in Human Years)
300 pets calculated using science-backed models
Updated in real timeDOG AGE QUICK REFERENCE
Dog years to human years
Compare estimated human-age equivalents by adult dog size.
| Dog age (years) | SmallUp to 9 kg (20 lb) | Medium9–23 kg (21–50 lb) | Large23–41 kg (51–90 lb) | GiantOver 41 kg (90 lb) |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 |
| 5 | 36 | 37 | 40 | 42 |
| 8 | 48 | 51 | 55 | 64 |
| 10 | 56 | 60 | 66 | 78 |
| 12 | 64 | 69 | 77 | 93 |
| 15 | 76 | 83 | 93 | 115 |
These are general estimates. Breed, health, and individual development can affect aging.
HOW THE ESTIMATE WORKS
Pet aging is not a simple ×7
There is no exact one-to-one conversion. The calculator combines age, species, and dog size with published life-stage guidance.
Age is not linear
Cats and dogs mature rapidly early in life, then age at different rates as adults.
Adult size matters for dogs
Larger dogs generally enter later-life stages sooner than smaller dogs, though breed and health also matter. Need a quick reference? Check our full Dog Age Conversion Chart for small, medium, large, and giant breeds.
Life stage is the useful part
The human-age number is an estimate; life stage offers better context for everyday care conversations.
Looking for a breed-specific estimate? Browse dog breed calculators.
Frequently asked questions
What the result means and how to use it.
Method and sources
Life-stage language is informed by professional veterinary guidance. Human-age values are simplified estimates.
- 2019 AAHA Canine Life Stage GuidelinesAmerican Animal Hospital Association
- FelineVMA Feline Life StagesFeline Veterinary Medical Association
- Global Nutrition ToolkitWorld Small Animal Veterinary Association
- Supplements for Dogs and CatsAssociation of American Feed Control Officials
- 2023 Senior Care GuidelinesAmerican Animal Hospital Association
- Wang et al. (2020): Dog-to-human aging and DNA methylationUC San Diego / Cell Systems
Life-stage boundaries vary by size, breed, health, and individual development.
This calculator provides a general educational estimate. It cannot assess health, predict lifespan, or diagnose a condition. Ask a veterinarian for advice specific to your pet.