Is this dog age calculator free?

Yes, completely free with no signup and no usage limits.

Does my data leave my device?

No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.

Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.

Enter your dog's age and breed size to see the human-equivalent age. Large breeds age faster than small ones.

100% client-side · no upload

Dog's age (years) Breed size

Enter your dog's current age in years (decimals allowed, e.g. 1.5 for 18 months).
Select your dog's breed size — small, medium, or large.
The human-equivalent age updates instantly below.

Is this dog age calculator free?: Yes, completely free with no signup and no usage limits.
Does my data leave my device?: No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
Does it work on mobile?: Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.