Pet Age Calculator - Size-Aware Dog & Cat Years Converter

How Pet Aging Works

Dog Age Calculation

Dogs age quickly in the first two years, then slow down depending on size. Our dog age calculator uses a size-aware curve to estimate dog years to human years for small, medium, large, and giant dogs.

Cat Age Calculation

Cats also age rapidly early on. The cat age calculator converts cat years to human years with a feline-specific curve—great for kittens through senior cats.

FAQ

How Size-Aware Pet Age Calculation Works

Pet Life Stages and Milestones

Puppy Development Stages

• 0-2 weeks: Neonatal period, eyes and ears closed
• 2-4 weeks: Transitional period, senses develop
• 4-12 weeks: Socialization period, critical for training
• 3-6 months: Juvenile period, basic training and house breaking
• 6-18 months: Adolescence, sexual maturity begins
• 1-2 years: Young adult, full size reached

Kitten Development Stages

• 0-2 weeks: Neonatal, dependent on mother
• 2-7 weeks: Socialization begins, weaning starts
• 7-9 weeks: Ready for adoption, basic independence
• 3-6 months: Rapid growth, spay/neuter timing
• 6-12 months: Adolescence, territorial behaviors develop
• 1-2 years: Young adult, personality established

Senior Pet Care Timeline

• Small Dogs: Senior at 10-12 years
• Medium Dogs: Senior at 8-10 years
• Large Dogs: Senior at 6-8 years
• Giant Dogs: Senior at 5-6 years
• Cats: Senior at 11-14 years, geriatric at 15+

Unlike the outdated "multiply by 7" rule, accurate dog age calculation must consider size. Small dogs under 20 lbs age slower than large dogs over 50 lbs throughout their lives.

Why Size Matters for Dog Age

• Small Dogs (Under 20 lbs): Live 12-16 years, age slower after year 2
• Large Dogs (Over 50 lbs): Live 8-12 years, age faster after maturity