Pawaide Pet Calculator
Dog Age Calculator
Convert your dog's age to human years — adjusted for breed size, based on the AAHA canine aging chart.
You can use decimals — e.g. 0.5 for 6 months.
Quick answer
A dog's first year equals about 15 human years, the second year adds about 9, and each year after adds 4–7 human years depending on breed size. This calculator uses that AAHA-based formula instead of the inaccurate ×7 rule.
How dog years convert to human years
The old "multiply by 7" rule isn't accurate. Dogs mature fastest in their first two years — a 1-year-old dog is roughly 15 in human years, and a 2-year-old is about 24. After that, each dog year adds 4–7 human years depending on size, with smaller breeds aging more slowly than giant breeds.
Use this dog years to human years calculator to better understand your dog's life stage and care needs.
Good to know
Frequently asked questions
How do you calculate dog years to human years?
A dog's first year equals about 15 human years, the second year adds about 9, and each year after adds 4–7 human years depending on breed size. This calculator uses that AAHA-based formula instead of the inaccurate ×7 rule.
Do small and large dogs age differently?
Yes. Smaller breeds tend to live longer and age more slowly later in life, while giant breeds age faster and are considered senior earlier — often by age 5–6.
At what age is a dog considered senior?
Most dogs are considered senior around 7 years old, but giant breeds may reach senior status by 5–6 and small breeds closer to 9–10.
Methodology
Sources & references
More pet calculators
These calculators provide general estimates for educational purposes and are not a substitute for professional veterinary advice.