Dog Years Chart
Dog Years to Human Years Chart
A simple dog years chart by size
Dog years are easier to understand when you can compare size groups side by side. The first two years count heavily, then small, medium, large, and giant dogs move at different speeds through the rest of the estimate.
This chart gives a friendly way to think about human years, but it is not a medical measurement. It is a useful guide for birthday fun, breed pages, age milestones, and life stage conversations.
For the most personal result, use the calculator with your dog’s birthday and breed. The chart is best for quick scanning, while the calculator adds exact age, birthday countdown, zodiac sign, birthstone, birth flower, and the matching breed guide.
Dog years chart for small, medium, large, and giant dogs
This chart uses a clear size-aware estimate. The first year is about 15 human years, the second year brings the estimate to about 24 human years, and every year after that adds a different amount depending on size.
Small dogs add about four human years per dog year after age two. Medium dogs add about five. Large dogs add about six. Giant dogs add about seven. This keeps the chart simple enough for everyday use while still giving size a meaningful role.
| Dog age | Small dog | Medium dog | Large dog | Giant dog |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 |
| 3 | 28 | 29 | 30 | 31 |
| 4 | 32 | 34 | 36 | 38 |
| 5 | 36 | 39 | 42 | 45 |
| 6 | 40 | 44 | 48 | 52 |
| 7 | 44 | 49 | 54 | 59 |
| 8 | 48 | 54 | 60 | 66 |
| 9 | 52 | 59 | 66 | 73 |
| 10 | 56 | 64 | 72 | 80 |
| 11 | 60 | 69 | 78 | 87 |
| 12 | 64 | 74 | 84 | 94 |
| 13 | 68 | 79 | 90 | 101 |
| 14 | 72 | 84 | 96 | 108 |
| 15 | 76 | 89 | 102 | 115 |
| 16 | 80 | 94 | 108 | 122 |
| 17 | 84 | 99 | 114 | 129 |
| 18 | 88 | 104 | 120 | 136 |
| 19 | 92 | 109 | 126 | 143 |
| 20 | 96 | 114 | 132 | 150 |
How to read the chart
Start with your dog’s actual age, then choose the column that best matches the dog’s adult size. If your dog is a French Bulldog, Dachshund, Chihuahua, Yorkshire Terrier, or Shih Tzu, the small dog column is usually the closest fit. If your dog is a Beagle, Bulldog, Australian Shepherd, Corgi, or Border Collie, the medium dog column may be closer.
Large dogs include breeds like Labrador Retrievers, Golden Retrievers, German Shepherds, Rottweilers, Boxers, and German Shorthaired Pointers. Giant dogs include Great Danes and other very large breeds. Mixed breed dogs can use the closest adult size group.
The chart does not know your individual dog’s health, weight, lifestyle, or veterinary history. It is best used as a friendly estimate and a way to understand why the same calendar age can feel different between breeds.
Breed examples from the chart
A six-year-old French Bulldog is about 40 in human years using the small-dog estimate. A six-year-old Labrador Retriever is about 48 using the large-dog estimate. A six-year-old Great Dane is about 52 using the giant-dog estimate. Those differences are exactly why Puppy Years asks for breed or size.
The breed pages build on this chart by adding a lifespan range, senior-stage estimate, birthday ideas, personality notes, and related breeds. That makes the age estimate feel more connected to the dog.
Dog age by year guides
The chart gives the quick comparison, but many owners want the exact page for their dog’s age. The dog age by year guides answer searches like 13 year old dog in human years, 14 year old dog in dog years, and is a 12 year old dog considered senior.
Each year page includes the small, medium, large, and giant dog estimates, life stage notes, birthday ideas, and links to nearby ages.
Calculate the exact birthday result
The chart is useful when you want to scan ages quickly. The calculator is better when you want the exact result for a real dog. It uses the birthday to calculate age in years, months, days, and total days. It also shows the next birthday countdown, half birthday, weekday, zodiac sign, birthstone, and birth flower.
Use the chart when you want a quick comparison. Use the calculator when you want a personalized result card with your dog’s name, breed, and birthday facts.
Frequently asked questions
Why does size change dog years?
Dogs of different sizes often move through life stages differently. Size is a helpful way to make the estimate more realistic.
Does the chart replace veterinary advice?
No. It is a friendly estimate for education and fun. Your veterinarian is the best source for health questions.
Which column should I use for a mixed breed dog?
Use the closest adult size group. When in doubt, medium is a reasonable starting point for many mixed breed dogs.
Why are the first two dog years different?
Dogs mature quickly in the first two years, so the estimate gives those years more weight than later adult years.