Dog Age Calculator
This Dog Age turns the figures for dog Age into a result you can review. Keep the inputs, units and time period consistent.
Human-equivalent age
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Old 7× rule says —
Life stage —
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How it works
Human age = 16 × ln(dog age) + 31 (UCSD 2020 epigenetic study)How to use the Dog Age
Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.
This is a general estimate and cannot replace advice from a qualified health professional.
Frequently Asked Questions
How do dog years really convert to human years?
A 2020 UC San Diego study of DNA methylation found dogs age very fast early, then slow down: human age ≈ 16 × ln(dog years) + 31. A 1-year-old dog is like a 31-year-old human; a 4-year-old is about 53.
Is the 7-year rule wrong?
As an average across a lifetime it is roughly right for medium dogs, but it badly understates early aging (a 2-year-old dog is not 14 in human terms — closer to 42) and overstates later years.
Do small dogs age slower than large dogs?
They live longer: small breeds often reach 14–16 years while giant breeds average 8–10. The formula here comes from Labrador data, so treat it as a mid-size estimate.