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Dog Age Calculator by Breed

Select the breed and enter your dog’s age. The calculator will let you know how old your dog is in human years.

Simple Version : Dog Age: Breed:

What age is your dog

Months

Second Year Aging

First Year Aging

Human Life Expectancy

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The Dog Age Calculator helps determine the age of your dog in equivalent human years by considering breed characteristics, size, or weight range. This tool helps pet owners better understand their dog's life stage and health requirements.

Dog Years to Human Years

One year of a dog’s life is not exactly seven human years. According to the American Veterinary Medical Association:

The first year of a medium-sized dog is equivalent to 15 human years
The second year of a dog’s life equals approximately 9 human years
After that, each human year is roughly 5 dog years

The common belief that 1 human year equals 7 dog years originated in the 1950s based on general lifespan assumptions.

Formula to Convert Human Years to Dog Years

Human Years to Dog Years = (Human Years - 2) × 4 + 21

Dog Breed Life Expectancy

Dog breeds age at different speeds. Below are average life spans according to breed size:

Breed Size	Average Life Span
Small or Toy Breed (less than 20 lbs)	10-15 years
Medium Breed (20-50 lbs)	10-13 years
Large Breed (50-90 lbs)	8-12 years
Giant Breed (more than 90 lbs)	8-10 years

Common Signs of Aging in Dogs

Greying hair
Poor or cloudy eyesight
Hearing difficulties
Stiff muscles and joints, arthritis
Lower activity level
Behavioral changes such as aggression, fear, anxiety, confusion, inappropriate elimination, irritability

Why Smaller Dogs Live Longer

Studies show that smaller dogs tend to live longer than larger dogs. Research indicates that a dog’s life expectancy decreases by roughly 1 month for every 2 kg of body weight. Reasons include:

Larger dogs are more prone to age-related illnesses
Smaller dogs have faster metabolic rates and less strain on vital organs
Larger dogs have higher risks of abnormal cell growth and cancers due to rapid growth

How to Use the Dog Age Calculator

To calculate your dog’s age in human years, input the required values and the calculator will provide results instantly.

Required Values:

Select the dog age version you want to calculate
Enter the relevant values such as breed size and age
Click on "Calculate"

Results Summary:

Dog's age in human years
Dog Breed Group
Recommended care level
Maintenance Level
Life Span
Height & Weight
Temperament
Hypoallergenic status
Color options

Dog Breed Age Chart

This chart shows how a dog’s age compares to human years for different sizes of dogs. The dog age calculator works for dogs up to 20 years.

Years	20 lbs or less	21-50 lbs	51-100 lbs	100+ lbs
1 year	15	15	15	12
2 years	24	24	24	22
3 years	28	28	28	31
4 years	32	32	32	38
5 years	36	36	36	45
6 years	42	42	45	49
7 years	47	47	50	56
8 years	51	51	55	64
9 years	56	56	61	71
10 years	60	60	66	79
11 years	65	65	72	86
12 years	69	69	77	93
13 years	74	74	82	100
14 years	78	78	88	107
15 years	83	83	93	114

References:

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