Dog Age to Human Age Converter

This dog age to human age converter allows you to calculate the equivalent in human years of your dog's age. Find out how old your companion would be if it were human! This tool takes into account the dog's size, as small dogs live longer than large ones.

Contrary to the myth of multiplying by 7, the calculation is more complex and depends on size. Enter your dog's age and size to find out its equivalent human age!

Need help with this tool ?

Enter your dog's age in years and select its size. The tool will automatically calculate the equivalent in human years according to the recognized veterinary scale.

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Calculate your dog's human age

Enter your dog's age in years and select its size. You can use decimals (e.g., 2.5 for two and a half years).

Dog's age (in years)

Dog's size

Your dog is equivalent to 39 years old in human age

Why Does Dog Size Matter?

Small dogs generally live longer than large dogs. A Chihuahua can live up to 15-20 years, while a Great Dane rarely exceeds 8-10 years. This difference is reflected in the calculation of equivalent human years.

The Recognized Conversion Scale

The first year of a dog equals approximately 15 human years (regardless of size)

The second year adds approximately 9 human years (24 years at age 2)

Each subsequent year depends on the dog's size:

Small dog (<22 lbs): +4 years per year
Medium dog (22-55 lbs): +5 years per year
Large dog (55-100 lbs): +6 years per year
Giant dog (>100 lbs): +7 years per year

Dog Age to Human Age Conversion Table

Dog Age	Small (<22 lbs)	Medium (22-55 lbs)	Large (55-100 lbs)	Giant (>100 lbs)
1 year	15 years	15 years	15 years	15 years
2 years	24 years	24 years	24 years	24 years
3 years	28 years	29 years	30 years	31 years
4 years	32 years	34 years	36 years	38 years
5 years	36 years	39 years	42 years	45 years
6 years	40 years	44 years	48 years	52 years
7 years	44 years	49 years	54 years	59 years
8 years	48 years	54 years	60 years	66 years
9 years	52 years	59 years	66 years	73 years
10 years	56 years	64 years	72 years	80 years

Dog Age

Small (<22 lbs)

Medium (22-55 lbs)

Large (55-100 lbs)

Giant (>100 lbs)

1 year

15 years

2 years

24 years

3 years

28 years

29 years

30 years

31 years

4 years

32 years

34 years

36 years

38 years

5 years

36 years

39 years

42 years

45 years

6 years

40 years

44 years

48 years

52 years

7 years

44 years

49 years

54 years

59 years

8 years

48 years

54 years

60 years

66 years

9 years

52 years

59 years

66 years

73 years

10 years

56 years

64 years

72 years

80 years

Examples of Breeds by Size Category

Small dogs (<22 lbs): Chihuahua, Yorkshire, Bichon, Cavalier King Charles, Shih Tzu

Medium dogs (22-55 lbs): Beagle, Cocker Spaniel, French Bulldog, Border Collie, Brittany Spaniel

Large dogs (55-100 lbs): Labrador, Golden Retriever, German Shepherd, Boxer, Husky

Giant dogs (>100 lbs): Great Dane, Saint Bernard, Newfoundland, Mastiff, Leonberger

The Different Life Stages of a Dog

Puppy (0-6 months): Rapid growth, socialization, basic training

Junior (6 months - 2 years): Adolescence, boundless energy, end of growth

Adult (2-7 years): Maturity, stable behavior, peak condition

Senior (7+ years small / 5+ years large): Beginning of aging, adapted needs

Average Life Expectancy by Size

Dog Size	Average Life Expectancy
Small (<22 lbs)	12-16 years
Medium (22-55 lbs)	10-14 years
Large (55-100 lbs)	9-12 years
Giant (>100 lbs)	7-10 years

Dog Size

Average Life Expectancy

Small (<22 lbs)

12-16 years

Medium (22-55 lbs)

10-14 years