Why multiplying by seven is not enough
Multiplying by seven is a popular oversimplification. Aging varies by species and does not progress at the same rate throughout life. For dogs, adult size also changes the approximate equivalent.
Pets
Pet age calculator
Estimate your dog's or cat's equivalent age using a reference table by species and adult size.
General estimate
How old is your pet?
Choose species, age and adult size for a dog. This calculator does not use the multiply-by-seven rule.
Use approximate adult weight, not a puppy's current weight.
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Equivalence table
Choose a view to explore the table without a wide layout. The rows used are highlighted when a result is available.
| Actual age | Approx. human years |
|---|---|
| 6 months | 10 |
| 1 years | 15 |
| 2 years | 24 |
| 3 years | 28 |
| 4 years | 32 |
| 5 years | 36 |
| 6 years | 40 |
| 7 years | 44 |
| 8 years | 48 |
| 9 years | 52 |
| 10 years | 56 |
| 11 years | 60 |
| 12 years | 64 |
| 13 years | 68 |
| 14 years | 72 |
| 15 years | 76 |
| 16 years | 80 |
| 17 years | 84 |
| 18 years | 88 |
| 19 years | 92 |
| 20 years | 96 |
| 21 years | 100 |
The initial view shows cats. When you choose a dog, its size table is displayed.
Preventive care
Equivalent age can support a better conversation with your veterinarian about preventive care, activity, weight and behavior changes. It does not replace a clinical evaluation.
Related tools
The pet calorie calculator belongs to the same category and can complement this estimate.
View pet calorie calculatorFrequently asked questions
How old is my dog in human years?
It depends on actual age and adult size. This calculator uses a veterinary reference table instead of the oversimplified multiply-by-seven rule.
How old is my cat in human years?
The table starts at 6 months for cats and extends to 21 years. The calculator provides an interpolated estimate between published ages.
Why isn't multiplying a dog's age by seven enough?
Aging does not progress at the same rate throughout life and, for dogs, varies with adult size.
Does size change a dog's equivalent age?
Yes. After the first few years, large and very large dogs generally have different equivalents from small or medium dogs.
What if I don't know my dog's adult size?
Use the approximate adult weight. If your dog is still a puppy, choose its expected adult size or consult your veterinarian.
Can I calculate age using only the birth date?
Yes. The calculator converts a birth date to complete months and uses that age to find the equivalent.
Does the equivalent age replace a veterinary checkup?
No. It is an educational reference. Breed, health, weight, activity and lifestyle can affect how a pet ages.