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Dog Years Calculator – Dog Age in Human Years

Use this dog years calculator to convert your dog’s age to human years, taking its size into account.

My tools →
Animal
years
months
Size (adult weight)

Small < 9 kg (20 lb) · medium 9–23 kg · large 23–41 kg · giant > 41 kg (90 lb)

Human years

–

Based on DNA methylation research in Labrador retrievers (UC San Diego, 2019). It ages young dogs faster than the classic chart.

Runs in your browser – your data never leaves your device Also available via our free API

Dog age chart in human years

Animal age Small Medium Large Giant
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 40 42 45 49
7 years 44 47 50 56
8 years 48 51 55 64
9 years 52 56 61 71
10 years 56 60 66 79
11 years 60 65 72 86
12 years 64 69 77 93
13 years 68 74 82 100
14 years 72 78 88 107
15 years 76 83 93 114
16 years 80 87 99 121

How to use the Dog Years Calculator

  1. 1 Choose the animal.
  2. 2 Enter its age in years and months (for dogs, also pick the size).
  3. 3 Read the age in human years and the matching life stage.

Size matters

Small dogs live longer than big dogs, and that shows in how fast they age. All dogs grow up quickly: after one year a dog is roughly 15 in human terms, and after two years about 24. From then on a small dog adds about 4 human years per year, while a giant breed such as a Great Dane adds about 7.

Size Adult weight Examples
Small under 9 kg (20 lb) Chihuahua, Jack Russell, Dachshund
Medium 9–23 kg (20–50 lb) Beagle, Cocker Spaniel, Border Collie
Large 23–41 kg (50–90 lb) Labrador, German Shepherd, Boxer
Giant over 41 kg (90 lb) Great Dane, Newfoundland, St. Bernard

The epigenetic formula

In 2019 researchers at UC San Diego compared DNA methylation – chemical marks that change with age – in Labrador retrievers and humans. Their formula, human age = 16 × ln(dog age) + 31, suggests puppies age even faster than the chart says: a one-year-old dog is about 31 in human terms. It was developed for Labradors, so treat it as an interesting alternative rather than a replacement.

When is a dog a senior?

Small dogs are usually considered seniors from about 10–12 years, large breeds from about 6–8 years. Senior dogs benefit from twice-yearly vet check-ups, adapted food and gentle daily exercise.

Frequently asked questions

How old is a 10-year-old dog in human years?

About 56 for a small dog, 60 for a medium dog, 66 for a large dog and 79 for a giant breed.

Why do large dogs age faster?

Large breeds grow fast and have shorter lifespans, and age-related problems appear earlier. Scientists are still investigating the exact biological reasons.

How do I calculate my puppy’s age?

Enter the age in months. Under one year the calculator scales up to about 15 human years at the first birthday.

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