Dog Age Calculator (Dog Years to Human Years)
Dog age calculator: convert dog years to human years with the 2019 UCSD DNA-methylation formula, compared with the old “× 7” rule.
H = 16 · ln(d) + 31
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Researchers found dogs age fast early on: human age ≈ 16 × ln(dog age) + 31. A 1-year-old dog is like a 31-year-old human.
The formula was derived from Labradors and fits adult dogs best.
Formula
H = 16 · ln(d) + 31
| Symbol | Quantity | Units |
|---|---|---|
| d | Dog's age | s, ms, µs, ns, min, h, d, wk, yr |
| H | Equivalent human age | s, ms, µs, ns, min, h, d, wk, yr |
Worked example
Given: d = 4 yr
H = 16 ln d + 31
Result: H = 53.1807 yr
Equivalent human age for different values of Dog's age
| d · Dog's age | H · Equivalent human age |
|---|---|
| 2 yr | 42.09 yr |
| 3 yr | 48.578 yr |
| 3.6 yr | 51.495 yr |
| 4 yr | 53.181 yr |
| 4.4 yr | 54.706 yr |
| 5 yr | 56.751 yr |
| 6 yr | 59.668 yr |
| 8 yr | 64.271 yr |
Other values as in the worked example.
Frequently asked questions
How old is a 4-year-old dog in human years?
About 53 (the “× 7” rule says 28).
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