Dog Age Calculator

Free online calculator to convert dog age to human age based on scientific formulas, supporting small, medium, and large breed sizes with a complete comparison chart.

Equivalent Human Age

56.8

A 5-year-old dog is about 56.8 human years old

Dog AgeSmallMediumLarge
1131517
2222426
346.648.650.6
451.253.255.2
554.856.858.8
657.759.761.7
760.162.164.1
862.364.366.3
964.266.268.2
1065.867.869.8
1268.870.872.8
1471.273.275.2
1673.475.477.4
1875.277.279.2
2076.978.980.9

What Is a Dog Age Calculator?

The dog age calculator converts dog age to human age using a biology-based formula, supports small, medium, and large breed size differences, and includes a complete 1-20 year comparison chart.

How to Use

Using the dog age calculator is simple:

  • Enter your dog's age
  • Choose your dog's size
  • View the corresponding human age and comparison chart instantly

Tips

  • Puppies grow much faster than the "×7" rule suggests
  • Size choice affects results more noticeably for large breeds
  • This result is for fun and reference only - consult a vet for health concerns

Frequently Asked Questions

How is dog age converted to human age?+
This tool uses a scientific formula: the first two years equal about 24 human years, then each year adds roughly 16×ln(dog age)+31, with adjustments for breed size.
Why does breed size affect the conversion?+
Small breeds mature faster but age more slowly overall; large breeds are the opposite. So at the same dog age, large breeds have a higher human age.
Is the "dog age × 7" rule accurate?+
No. The "×7" rule is just a rough rule of thumb that ignores early development speed and size differences. The logarithmic formula is much closer to real biology.
How do I use the comparison chart?+
The chart lists the human ages corresponding to dogs of different sizes from 1 to 20 years old, so you can quickly look up the reference human age for any dog age.

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Dog Age Calculator — free online dog age calculator, dog years to human years, dog years to human years converter, dog age, dog age calculator online, dog age chart, pet age. No signup required. Works in your browser.