Age & Life calculators

Pet ages do not convert at a fixed rate. These tools show the size-based chart vets use, the newer epigenetic formula for dogs, and the life stages that matter for check-ups and diet changes.

• Cat Age CalculatorConvert your cat's age into human years and see its life stage.
• Dog Age CalculatorConvert your dog's age into human years, taking size into account.
• Puppy & Kitten Age CalculatorFind your puppy's or kitten's exact age in weeks, months and days from its birth date.
• Dog Age from Birth Date CalculatorEnter your dog's birth date and size to see its exact age and its age in human years.
• Cat Age from Birth Date CalculatorEnter your cat's birth date to see its exact age, its age in human years and its life stage.
• Pet Birthday CalculatorFind your pet's next birthday, how many days away it is and how old it will turn.
• Dog Life Stage CalculatorFind out which AAHA life stage your dog is in and when it becomes a senior, from its age and estimated lifespan.

Every calculator shows its formula and sources, works in metric and imperial units, and gives estimates only. Read how we build and review them in our editorial policy and formulas & sources.