Pet Age Calculator
Convert your dog or cat's age to human years. Our calculator uses the scientifically-backed formula that accounts for the rapid aging in a pet's first two years.
How Pets Age Differently
The old "1 dog year = 7 human years" rule is a myth. Dogs and cats age much faster in their first two years of life than humans do. After that, aging slows down but varies significantly by breed and size.
For dogs: the first year equals about 15 human years, the second year equals 24 human years, and each additional year adds about 4 human years. This formula works well for medium-sized dogs.
For cats: the progression is similar — 15 human years for the first year, 24 for the second, and 4 for each additional year. Indoor cats generally live longer than outdoor cats due to reduced risks.
How to Use This Calculator
- Select whether your pet is a dog or cat
- Enter your pet's age in years
- Click "Convert to Human Years"
- See the equivalent human age and the formula used