Dog Age & Lifestyle Calculator

Q: Why isn't 1 dog year always equal to 7 human years?

Dogs mature faster in their first two years than humans do, and larger dog breeds age faster in adulthood than smaller breeds.

Q: How are daily calories calculated for dogs?

Daily calories use the veterinary Resting Energy Requirement formula adjusted for lifestyle activity level.

Convert your dog's age into human years based on their breed size, and calculate their daily calorie needs based on their activity level.

Dog's Age (Years)

Dog Size / Weight Category

Exact Weight (lbs)

Lifestyle & Activity Level

Dog Size Category	First Year	Second Year	Each Additional Year
Small (<20 lbs)	15 human yrs	+9 human yrs (+24 total)	+4 human yrs/yr
Medium (21–50 lbs)	15 human yrs	+9 human yrs (+24 total)	+5 human yrs/yr
Large (51–90 lbs)	15 human yrs	+9 human yrs (+24 total)	+6 human yrs/yr
Giant (>90 lbs)	12 human yrs	+9 human yrs (+21 total)	+7 to 8 human yrs/yr

Frequently Asked Questions

Why isn't 1 dog year always equal to 7 human years?

Dogs mature much faster during their first two years of life than humans do. Additionally, smaller dog breeds age at a significantly slower rate in adulthood compared to giant breeds.

How are daily calories calculated for dogs?

We calculate Resting Energy Requirement (RER) using body weight: $\text{RER} = 70 \times (\text{weight in kg})^{0.75}$, then apply an activity multiplier based on your dog's lifestyle.