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Pet Age Calculator
Convert your dog's or cat's age into human years, with separate tables by breed size.
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When to use it
3-year-old small dog → about 28 in human years
5-year-old cat → about 36
A 7-year-old large dog is over 60
How to use it
1Step 1Fill in Pet
2Step 2Change a value and the result updates instantly
3Step 3Save or copy the result
If the result looks off
The result looks wrong
Check the units and the baseline first. Changing a value updates the result instantly.
I want the starting values back
Press reset to return to the initial state.
Frequently asked questions
How are small and large dogs different?
The conversion uses different rates by weight band — large dogs age faster.
Is it accurate for puppies?
The first two years use fixed values, then a per-year rate by size.
Does breed matter beyond size?
Only size band is used; individual breeds can vary a little.