Dog & Cat Age Calculator
Enter your pet's age to see the equivalent in human years, using up-to-date veterinary formulas rather than the old "multiply by 7" rule.
FAQ
Why isn't it just 'multiply by 7'?
The old ×7 rule doesn't reflect how animals actually age — dogs and cats mature much faster in their first couple of years than the multiplier suggests, then age more slowly afterward. Modern estimates use a curve rather than a flat multiplier.
Does dog size really affect aging speed?
Yes — larger dog breeds tend to have shorter lifespans and age faster in their later years compared to smaller breeds, which is why this calculator factors in size for dogs.
Is this calculation exact?
No single formula perfectly matches every individual animal — breed, genetics, and health all play a role. This gives a reasonable estimate based on commonly used veterinary aging curves, not a precise medical measurement.
Do cats age differently by breed or size the way dogs do?
Size and breed have much less impact on cat aging compared to dogs, so this calculator uses a single formula for all cats rather than breaking it down by size.
About this tool
This calculator converts your dog's or cat's age into an equivalent human age, using aging-curve estimates rather than the outdated 'multiply by 7' rule. Dog results also factor in size, since larger breeds age differently than smaller ones. This is a general estimate, not veterinary advice.