Dog Age Calculator

The "7-Year Rule" Is a Myth. Here's the Real Science.

For decades, we've been told that one dog year equals seven human years. It's simple, but it's wrong. Modern science, based on changes in DNA over time (epigenetic clocks), shows that dogs age much more rapidly in their first two years and then the rate slows. This calculator uses a more accurate, modern formula that also accounts for a crucial variable: your dog's size. Small and large breeds age at very different rates.

How to Find Your Dog's "Human" Age

It's easy to get a more accurate age equivalent:

1. Enter Your Dog's Age: Input your dog's chronological age in years.
2. Select Dog Size: This is critical. Choose whether your dog is a small, medium, or large breed.

The calculator will instantly show their approximate age in human years.

Why Does Size Matter So Much?

• Rapid Early Aging: A one-year-old dog is not like a 7-year-old child; they are equivalent to a human teenager. This is true for all sizes.
• Slower Later Aging: After the first two years, the aging process slows down.
• The Great Dane vs. Chihuahua Effect: Small dogs tend to live much longer and age more slowly in their senior years compared to large and giant breeds, which age very rapidly after about 5-6 years.