🐶 Dog Age Calculator
Convert your dog's age into human-equivalent years using a widely published formula that's more realistic than the old "1 dog year = 7 human years" rule of thumb.
Commonly published formula: 16 × ln(age) + 31.
How the Dog Age Calculator works
The formula (16 × ln(dog's age) + 31) reflects that dogs age very rapidly in their first couple of years, then more gradually after — the old "×7" rule doesn't capture this curve at all.
Step-by-step calculation
- 1Enter your dog's age.
- 2Apply 16 × ln(age) + 31.
- 3Read the human-equivalent age.
Worked example
A 4-year-old dog: 16 × ln 4 + 31 = 16 × 1.386 + 31 ≈ 53 human years.
Dog Age Calculator examples
| Dog's age (years) | Human-equivalent age |
|---|---|
| 1 | 31 human years |
| 2 | 42 human years |
| 4 | 53 human years |
| 7 | 62 human years |
| 10 | 68 human years |
| 14 | 73 human years |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Dog Age Calculator?
Understand your dog's life stage and care needs.
Important factors that can affect your results
- Breed size (large dogs age faster).
- The formula is an estimate.
- Health and lifestyle.
Frequently asked questions
Is the "multiply by 7" rule accurate?
No — it's a popular myth. Dogs age much faster in their first two years and slower afterward, which this formula reflects better.
Does breed size affect aging rate?
Yes, in reality larger breeds tend to age faster in their senior years than small breeds — this calculator uses a general size-independent formula.
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Last reviewed November 2026 · How we build and check our tools · Report a problem