Pet Calculators
4 free tools for cat and dog age and pregnancy tracking.
A Numeric Guide for Cat and Dog Owners
The cat and dog age calculators do not use the folk rule of one animal year equals seven human years; they run on veterinary curves that account for rapid maturation in the first two years and, for dogs, breed size (small breeds age slower, giant breeds faster). That is why a 3-year-old Chihuahua and a Great Dane of the same age map to different human ages.
The pregnancy tools estimate the delivery window from the mating date: 63-65 days on average for cats, 58-68 days for dogs. The result is a range, not a single day; as the date approaches, read behavioral signs like reduced appetite and nesting alongside the window.
These tools do not replace veterinary care. Ultrasound gives definitive pregnancy information, and age estimates should be interpreted together with dental and overall health checks. Keep up regular veterinary visits.