Calculate exact dog and cat age in human years using veterinary breed weight curves.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Choose Dog or Cat, and pick your dog's breed weight category (Small, Medium, Large, Giant).
Input pet age in calendar years and optional extra months.
Inspect human equivalent age, life stage category (Puppy, Prime Adult, Senior), and care milestones.
No. Modern veterinary science demonstrates that dogs age much faster during their first 2 years (reaching biological adulthood ~24 human years), after which smaller breeds age slower than giant breeds.
A 1-year-old cat equals approximately 15 human years, a 2-year-old equals ~24 human years, and each subsequent feline year adds approximately 4 human years.
Zero-egress companion tools in the Calculators suite
Calculate 0 60 with instant lifestyle estimation and step-by-step verified outputs.
Calculate 100 day with instant lifestyle estimation and step-by-step verified outputs.
Calculate 120 day with instant lifestyle estimation and step-by-step verified outputs.
Calculate 120 day quiz with instant lifestyle estimation and step-by-step verified outputs.
