Dog Age Calculator

Convert dog years to human years accurately. Size-based calculation gives you the true age equivalent and life stage.

Your dog's age in years (can use decimals)

Based on adult weight

AVMA Formula (Size-Adjusted):\nYear 1 = 15 human years\nYear 2 = 9 human years\nYear 3+ = 4-6 years each (varies by size)\n\nSmall dogs: +4 years per year\nMedium: +5 years\nLarge: +5.5 years\nGiant: +6 years
Example 1 (Small Dog):\nDog Age: 10 years\nSize: Small (15 lbs Terrier)\n\nHuman Age = 15 + 9 + (8 × 4) = 56 years\nLife Stage: Senior\n\nExample 2 (Large Dog):\nDog Age: 8 years\nSize: Large (70 lbs Lab)\n\nHuman Age = 15 + 9 + (6 × 5.5) = 57 years\nLife Stage: Senior (large dogs age faster)

How do you calculate dog years to human years?

Modern calculation: First year = 15 human years, second year = 9 human years, then each year after = 4-5 human years depending on size. The old "1 dog year = 7 human years" rule is outdated and inaccurate.

Why does dog size matter for age calculation?

Larger dogs age faster than smaller dogs. A 10-year-old small dog (under 20 lbs) is about 56 in human years, while a 10-year-old giant dog (over 90 lbs) is about 66. Large breeds have shorter lifespans and reach senior age sooner.

What is the most accurate dog age formula?

The American Veterinary Medical Association (AVMA) method considers size: Year 1 = 15, Year 2 = 9, then 4-6 years per dog year based on weight category. Scientists also developed a logarithmic formula: 16 × ln(dog age) + 31, but size-based is more practical.

At what age is a dog considered senior?

Small breeds (under 20 lbs): 11-12 years. Medium (21-50 lbs): 10 years. Large (51-90 lbs): 8-9 years. Giant breeds (over 90 lbs): 6-7 years. Senior dogs need different care, diet, and veterinary monitoring.

How long do different dog breeds typically live?

Small breeds: 12-16 years (Chihuahuas, Pomeranians). Medium: 10-14 years (Beagles, Bulldogs). Large: 8-12 years (German Shepherds, Retrievers). Giant: 6-10 years (Great Danes, Mastiffs). Mixed breeds often live slightly longer than purebreds.