Dog Age Calculator

Find out how old your dog is in human years using the veterinary-recommended formula, adjusted for your dog's size.

Accepts decimals — e.g. 0.5 for 6 months

Enter your dog's age above to see the result.

How the Formula Works

The old “multiply by 7” rule is a myth. Dogs age much faster in their first two years and then slow down as they mature. The American Veterinary Medical Association (AVMA) recommends a more accurate size-based approach:

  • Year 1 is approximately 15 human years for all sizes
  • Year 2 adds approximately 9 more human years
  • After year 2: small breeds +4/yr, medium +5/yr, large +6/yr, giant +7/yr

Larger breeds age faster in their adult years and tend to have shorter lifespans, which is why size is such an important factor in the calculation.

Size Guide

Small
Under 20 lbs
Chihuahua, Pomeranian, Shih Tzu
Avg lifespan: ~15 years
Medium
20–50 lbs
Beagle, Border Collie, Cocker Spaniel
Avg lifespan: ~13 years
Large
50–90 lbs
Labrador, German Shepherd, Golden Retriever
Avg lifespan: ~11 years
Giant
90+ lbs
Great Dane, Saint Bernard, Mastiff
Avg lifespan: ~9 years
Note: This calculator provides estimates based on general population data. Individual dogs vary significantly based on genetics, diet, exercise, and veterinary care. For health assessments specific to your dog, consult your veterinarian.