Dog agein humanyears
Free calculator: enter your dog’s age and see how many human years that is and which life stage it is in.
How old is your dog in human years?
Move the slider to your dog’s age and see the human equivalent and the life stage.
Equivalent to
How do you calculate a dog’s age in human years?
For years people said one dog year equals seven human years. That is a myth: dogs age very fast at first and more slowly later. A University of California San Diego study (2020) compared dog and human DNA and proposed a formula: human age = 16 × ln(dog age) + 31.
Life stages
| Age | Stage | What they need |
|---|---|---|
| Up to 1 year | Puppy | Vaccines, socialisation, routine |
| 1–2 years | Young | Exercise and training |
| 2–7 years | Adult | Walks, play and yearly check-ups |
| 7–10 years | Mature adult | More frequent vet visits |
| 10+ years | Senior | Rest, soft beds and veterinary care |
About Dejando Huella
We are a non-profit dog rescue near Medellín, Colombia, caring for 216 dogs. Learn more about us.
Dog age questions.
Is one dog year really seven human years?
No, it is a myth. A one-year-old dog is roughly like a teenager, and then ages more slowly. The University of California San Diego formula uses a logarithm to reflect that.
At what age is a dog a senior?
It depends on size: large dogs can be considered senior from 6 or 7 years, small dogs from 9 or 10. Your vet can advise for your dog.
Does the calculator work for mixed-breed dogs?
Yes, as a guide. The exact figure depends on breed, size and health.
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Every donation turns into food, care and a roof for rescued dogs in Colombia.