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Dog Age Calculator

Estimate a medium-sized dog’s age in human years with a transparent age conversion. Enter years and months.

Dog Age Calculator

FREE ONLINE TOOL
Assumptions and limits

This is a medium-dog analogy, not biological age or lifespan prediction. Breed, adult size and individual health affect aging. Fractional ages are interpolated for convenience.

Formula

a = years + months / 12; H = 15a (a ≤ 1), 15 + 9(a − 1) (1 < a ≤ 2), 24 + 5(a − 2) (a > 2).

Example

A 5-year-old medium-sized dog gives about 39 human-equivalent years.

Method source — AKC / AVMA

STEP BY STEP

How to use dog age calculator

  1. Calculate and read the result in the displayed units.
  2. Review the formula, example and limits.

IN PRACTICE

Example

A 5-year-old medium-sized dog gives about 39 human-equivalent years.

GOOD TO KNOW

How should I interpret this result?

This is a medium-dog analogy, not biological age or lifespan prediction. Breed, adult size and individual health affect aging. Fractional ages are interpolated for convenience.

Practical guides

Dog Years to Human Years: Formula, Examples and Limits →

Cat Years to Human Years: Age Chart and Calculation Guide →

How to Calculate Pet Food Cost per Day, Month and Year →

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