What this calculator does
Dog age in human years works out a dog's age converted to a human-equivalent age using the epigenetic-clock formula. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaHuman years = 16 × ln(dog years) + 31
The inputs explained
| Field | What to enter |
|---|---|
| Dog's age (years) | A number, measured in years. Starts at 5. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with dog's age
Every other input is held at the calculator’s starting values while dog's age varies. Select any row to load that scenario into the calculator.
How the answer changes with dog's age
| Dog's age (years) | Human-equivalent age | Dog age in months | Formula source |
|---|---|---|---|
| 2.5 | 45.7 years | 30.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |
| 3.75 | 52.1 years | 45.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |
| 5 | 56.8 years | 60.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |
| 7.5 | 63.2 years | 90.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |
| 10 | 67.8 years | 120.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |
| 15 | 74.3 years | 180.0 months | 16 × ln(age) + 31: the epigenetic-clock model from Wang et al. (2020), a closer match to real ageing than the old ×7 rule |