Pet age calculator

Convert your pet’s age to approximate human years.

Scroll, swipe, or use the ↑ ↓ keys to choose an age.

Adult weight group for your dog

Adult weight · 20 lb ≈ 9 kg · 50 lb ≈ 23 kg · 100 lb ≈ 45 kg

Frequently asked questions

Is one pet year really seven human years?

No. Cats and dogs develop quickly early in life, then age at different rates. Dog size also matters. A single multiplier misses those differences.

How do I convert pet years to human years?

Select your pet, enter its age in years and additional months, and select an adult weight group for a dog. The calculator interpolates between the reference points for the selected species.

How accurate is a pet age calculator?

Dog and cat results use published reference charts. The other five species use selected educational comparison models. All results are approximate, not measured biological ages or lifespan predictions.