Dog Age Calculator
Ever wonder how old your dog is in human years?
Just answer two quick questions.
When's your dog's birthday?
Not sure? Give us your best guess!
What breed is your dog?
Is your dog a mix? If so, select the most prominent breed.
Please pick a breed first.
The results
In human years your dog is
and would be considered
About This Online Dog Age Calculator
This free, automatic dog age calculator works as a dog years to human years converter. It is an easy way to calculate your dog’s real age and life stage, and it works for dog owners in the US, UK, Canada, Australia and everywhere else. Whether you want a canine age calculator for a puppy or a dog age estimator for a senior, you get an instant answer by breed, size or birthday.
The old “multiply by 7” rule is a myth. Dogs mature quickly in the first two years, and larger dogs age faster than smaller dogs. This page gives you the calculator, a full dog years chart, a human to dog years converter and answers to the most common questions.
How the Dog Age Calculator Works
Use the calculator above in two quick steps:
Enter your dog’s birthday
Choose the month and year. Not sure? A best guess works fine.
Select your dog’s breed
For a mixed breed, pick the most prominent breed or choose the Mixed Breed option that matches your dog’s size.
Get your result
You instantly get your dog’s age in human years and their life stage: puppy, adolescent, adult or senior.
How to Calculate a Dog’s Age (Manual Method)
No calculator handy? You can work out your dog’s age yourself:
Find your dog’s age
Subtract the birth year from the current year, and subtract one more year if the birthday hasn’t happened yet this year. For example, a dog born in 2018 is 8 in 2026 once the birthday has passed. If the dog is under a year old, count the months (or weeks).
Pick the size group
Use your dog’s adult weight: small (under 20 lb / 9 kg), medium (20-50 lb / 9-23 kg), large (50-90 lb / 23-41 kg) or giant (over 90 lb / 41 kg).
Read the chart below
Find the dog’s age in the left column and read across to the size group.
Dog Years to Human Years Chart
This dog years converter chart gives a quick answer for any age from 1 to 16, such as how old a 3-year-old, 10-year-old or 15-year-old dog is in human years. It is an age conversion for dogs based on AVMA guidelines and breed size. Larger dogs age faster than small dogs, so the numbers differ by size.
| Dog age (years) | Smallunder 20 lb / 9 kg | Medium20-50 lb / 9-23 kg | Large50-90 lb / 23-41 kg | Giantover 90 lb / 41 kg |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 12 |
| 2 | 24 | 24 | 24 | 22 |
| 3 | 28 | 28 | 28 | 31 |
| 4 | 32 | 32 | 32 | 38 |
| 5 | 36 | 36 | 36 | 45 |
| 6 | 40 | 42 | 45 | 49 |
| 7 | 44 | 47 | 50 | 56 |
| 8 | 48 | 51 | 55 | 64 |
| 9 | 52 | 56 | 61 | 71 |
| 10 | 56 | 60 | 66 | 79 |
| 11 | 60 | 65 | 72 | 86 |
| 12 | 64 | 69 | 77 | 93 |
| 13 | 68 | 74 | 82 | 100 |
| 14 | 72 | 78 | 88 | 107 |
| 15 | 76 | 83 | 93 | 114 |
| 16 | 80 | 87 | 99 | 121 |
Older than 16? Each extra dog year adds roughly 4 human years for small and medium dogs, about 6 for large dogs and about 7 for giant breeds. These are estimates, not exact measurements.
Quick Answers: How Old Is My Dog in Human Years?
Human Years to Dog Years Calculator
Want to go the other way? This human to dog years table shows what a given human age equals in dog years for each size group. For example, 62 in dog years is about 10 for a medium dog.
| Human age | Small dog | Medium dog | Large dog | Giant dog |
|---|---|---|---|---|
| 20 | 1.5 | 1.5 | 1.5 | 2 |
| 30 | 3.5 | 3.5 | 3.5 | 3 |
| 40 | 6 | 5.5 | 5.5 | 4.5 |
| 50 | 8.5 | 8 | 7 | 6 |
| 60 | 11 | 10 | 9 | 7.5 |
| 70 | 13.5 | 12 | 10.5 | 9 |
| 80 | 16 | 14.5 | 12.5 | 10 |
| 90 | 18.5 | 17 | 14.5 | 11.5 |
Dog Age Calculator by Weight (Small, Medium, Large and Giant Dogs)
Weight is the simplest way to pick a size group when you don’t know the breed or have a mixed breed dog. Use this guide for small dog years, medium dogs, large dog age and giant breeds:
Small dogs
Under 20 lb / 9 kg
Age more slowly and often live 14-16 years.
Medium dogs
20-50 lb / 9-23 kg
Typically live 11-13 years.
Large dogs
50-90 lb / 23-41 kg
Typically live 9-12 years.
Giant dogs
Over 90 lb / 41 kg
Age fastest and typically live 7-10 years.
Dog Age Calculator by Breed
Our dog breed age calculator covers more than 100 breeds, plus Mixed Breed options by size. Here is how some popular breeds usually fall in the size groups above. Always go by your own dog’s adult weight.
| Breed | Usual size group |
|---|---|
| Chihuahua | Small |
| Yorkshire Terrier (Yorkie) | Small |
| Pomeranian | Small |
| Maltese | Small |
| Jack Russell Terrier | Small |
| Boston Terrier | Small |
| French Bulldog | Small Medium Small under 20 lb, medium 20-28 lb |
| Shiba Inu | Small Medium |
| Cockapoo | Small Medium |
| Beagle | Medium |
| Standard Poodle | Medium Large |
| Labrador Retriever | Large |
| German Shepherd | Large |
| Goldendoodle | Varies: mini is Small Medium, standard is Large |
🐶 French Bulldog Age in Human Years
French Bulldogs are small-to-medium dogs. Their lifespan is often cited as about 10-12 years, and as a brachycephalic breed they can face more health challenges than average, so regular vet checkups matter as they age. Select “French Bulldog” in the calculator for a breed-specific result.
Read our full guide: French Bulldog Age in Human Years.
Puppy Age Calculator: Weeks and Months to Human Years
Use this puppy age calculator guide to convert weeks to months and estimate how old your puppy is in human years. Puppies grow fastest in their first year. To change weeks into months, divide by about 4.3.
| Weeks | Approx. months |
|---|---|
| 8 weeks | about 2 months |
| 12 weeks | about 3 months |
| 16 weeks | about 4 months |
| 26 weeks | about 6 months |
| 39 weeks | about 9 months |
| 52 weeks | 12 months (1 year) |
Puppy growth varies a lot by breed size, so treat these as approximations. Use our Puppy Weight Calculator to check whether your puppy is growing on track.
Dog Lap Day Calculator: When Will Your Dog Be Your Age?
“Lap Day” is a fun idea among dog lovers: it is the day your dog’s human-equivalent age catches up with your own age. You can work out your dog’s lap day with the chart above.
Example: you are 30 and your medium-sized dog is 2 years old, which is 24 in human years. Each year you gain 1 year while your dog gains about 4.
Dog: 2 (24 human years)
Dog: 3 (28 human years)
Dog: 4 (32 human years)
After your lap day, your dog is older than you in human-equivalent years. The same method works with the dog lap day calculator idea for any dog age, breed size or birthday.
A Newer, More Accurate Way to Calculate Dog Age
There are two common ways to calculate dog years, and they give different numbers, so it helps to know which one you are looking at.
The AVMA-based guideline
Used in the chart above. The first year of a dog’s life is about 15 human years, and the second is about 9 more. After that, each year adds roughly 4-7 human years depending on breed size. This is the quick reference most owners and vets use.
The epigenetic (DNA methylation) formula
Researchers at UC San Diego compared DNA methylation patterns in dogs and humans and proposed a dog years formula that many see as the new way to calculate dog age.
The study looked at 104 Labrador Retrievers (Wang et al., 2020, Cell Systems; doi:10.1016/j.cels.2020.06.006). Because it was built on one breed, it is best seen as an estimate for Labrador-sized dogs. It gives about 31 human years at age 1, which is higher than the AVMA guideline.
How to Tell How Old a Dog Is
If you adopted a rescue or don’t know your dog’s birthday, these signs give a rough idea of age. Only a veterinarian can give a reliable estimate.
Teeth
Puppies have small baby teeth, and adult teeth are in by about 6-7 months. Clean white teeth suggest 1-2 years. Yellowing and tartar suggest 3-5 years or more. Heavy wear or missing teeth suggest a senior dog.
Eyes
A cloudy or bluish haze in the eyes is common in older dogs.
Coat
Gray hair on the muzzle and face often appears with age, though some dogs go gray early.
Energy and mobility
Stiffness, slower movement and more sleep point to an older dog.
Once you have an estimate, enter an approximate birth year into the calculator above.
Average Life of a Dog: How Long Will My Dog Live?
No calculator can tell you exactly how long your dog will live, but size gives a useful range. Larger dogs age faster and have shorter average lifespans: small breeds typically live 14-16 years, medium breeds 11-13, large breeds 9-12 and giant breeds 7-10.
Vets often consider a dog a senior at roughly 75% of its expected lifespan, which is why giant breeds can be senior as early as 5-6 years. Knowing your dog’s true age helps you start senior care, such as diet changes and more frequent checkups, at the right time. Our Dog Calorie Calculator can help you adjust food as your dog ages.
Dog Age Calculator FAQ
Is 1 dog year really equal to 7 human years?
No. The “multiply by 7” rule is a myth. Dogs mature much faster early in life, so a 1-year-old dog is closer to a 15-year-old human than a 7-year-old child.
How old is my dog in human years?
Enter your dog’s birthday and breed in the calculator above, or use the dog years to human years chart. The answer depends on your dog’s age and size.
How old is my dog if he is 5 (or 2, 3, 6, 8 or 9)?
For a small, medium or large dog, 5 years is about 36 human years, and for a giant breed it is about 45. Find the other ages in the chart above.
How old is a 17 or 18 year old dog in human years?
A 17-year-old small or medium dog is about 84-91 human years, and an 18-year-old is about 88-95. Large and giant breeds rarely reach these ages.
How do I calculate my dog’s age if I don’t know the birthday?
Estimate based on teeth, eyes, coat and activity level (see “How to Tell How Old a Dog Is” above), or ask your vet. Then enter a best-guess birth year in the calculator.
If my dog was born in 2018, how old is he?
Subtract the birth year from the current year. In 2026, a dog born in 2018 is 8 once the birthday has passed, and still 7 before it. Then use the chart for the human-equivalent age.
How old is my puppy in months or weeks?
Divide the puppy’s age in weeks by about 4.3 to get months. See the puppy table above for common conversions.
At what age is a dog considered a senior?
It depends on size. Giant breeds may be seniors at 5-6 years, large breeds at about 7-8, and small breeds not until 10-11. Many vets use roughly 75% of the expected lifespan as a guide.
Does the calculator work for mixed breed dogs?
Yes. Choose the most prominent breed, or pick the Mixed Breed option that matches your dog’s size: small, medium, large or giant.
Does breed size really change how fast dogs age?
Yes. Large and giant dogs age faster in human-year terms and typically live shorter lives than small dogs, as the chart above shows.
Is this the same as the Pedigree or Purina dog age calculator?
No. This calculator is independent and not affiliated with Pedigree, Purina or any pet food brand. It uses AVMA-based guidelines plus breed size, and it explains the newer epigenetic formula as well.
Do I need a vet to convert my dog’s age to human years?
No, the calculator and chart above are enough for a general answer. Ask your vet if you are unsure of your dog’s real age or if age affects a health decision, such as senior care, diet or medication.
More Free Dog Tools
- Dog Calorie Calculator
- Puppy Weight Calculator
- Dog Breed Selector
- Raw Dog Food Calculator
- Dog Name Generator
- American Veterinary Medical Association (AVMA) dog age guidance
- Wang T. et al. (2020). Quantitative translation of dog-to-human aging by conserved remodeling of the DNA methylome. Cell Systems.
This calculator provides estimates for general information and is not veterinary advice. Talk to your vet about your dog’s individual health needs.