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Dog Years to Human Years Calculator

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Weight: Pounds

dog holding calculator

If you already know when your dog was born, and simply want to convert dog years to human years, you can use two different methods – we recommend the first one (dog years to humarn years calculator based on the breed), as it is more accurate:

Calculator to Convert Dog Years to Human Years (Based on the Breed):

When estimating how old your dog is in human years, the primary factor to consider is your dog’s breed. Small breeds live longer on average and age more slowly than larger breeds: small breeds live as much as 50-80% longer than larger breeds and experience the negative effects of aging later in life compared to large breeds.

Research also shows that neutering status, and, to a lesser extent, sex are important factors to take into account. As a result, we have also taken these factors into account in our own calculator.

Use the calculator below to estimate your dog’s age in human years:

In human years, your dog is...

If your dog is a mixed breed, a reliable way to convert your dog’s age to human years is to use your dog’s size or weight.

Studies Used to Build the Calculator

Estimating a dog’s age in human years is not that simple. We have read and reviewed data from multiple studies to conclude that a breed-based calculator would be best.

To build the formula behind this calculator, we have used the following studies:

If Your Dog is a Mixed Breed, Use “Size” to Estimate Human Years:

All in all trying to figure out how old your dog is in ‘dog years’ v ‘human years’ isn’t an exact science. If your dog is mixed breed or if you don’t know your dog’s breed, the next most important factor to consider is size/weight.

To make it a little easier, we have put together this table that translates ‘dog years’ to ‘human years’ for small, medium and large breeds.

Your Dog’s Age‘Real’ Age – Small‘Real’ Age – Med‘Real’ Age – L & XL
1 year181614
2 years252421
3 years282927
4 years323432
5 years363842
6 years404248
7 years444857
8 years485463
9 years525970
10 years566375
11 years606882
12 years647490
13 years6879100
14 years7283108
15 years7689115
16 years8095120

But if you don’t know when your dog was born, how can you best estimate your dog’s age? Read our post on “How Old Is My Dog?” for easy tips to estimate how old your dog really is.


  • Dr. Winnie earned a Bachelor of Science in Psychology from Duke University, a Masters of Science in Biology from St Georges University, and graduated from the University of Pretoria Veterinary School in South Africa. She is a full-time Veterinarian in South Africa specializing in internal medicine for large breed dogs.

Disclaimer: This website's content is not meant to be a substitute for veterinary care, diagnosis, or treatment. Always consult with your veterinarian to determine the best course of action. Read More.

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