Is the 7-year rule accurate for dog age?

No — the 7-year rule has no scientific basis. A 1-year-old dog is already sexually mature. Dogs age approximately 15 human years in year one, then slow considerably.

When is a dog considered a senior?

Small breeds: 10–11 years. Medium breeds: 8–9 years. Large breeds: 7–8 years. Giant breeds: 5–6 years. The AVMA recommends vet visits every 6 months once a dog is senior.

Dogamiya

🐾 Calorie Calc

📅 Dog Age Calculator
Dog Years to Human Years

Convert your dog's age using the science-backed epigenetic formula, adjusted for breed size.

✓ Epigenetic Formula ✓ Breed Size Adjusted ✓ Free & Instant

📅

Dog Age Calculator

Dog's Age (years, decimals OK)

Breed Size

🐩 Small <20 lbs

🐕 Medium 20–50 lbs

🦮 Large 50–90 lbs

🐻 Giant 90+ lbs

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Human Years

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% of lifespan

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avg lifespan

📖 How It Works

The Science Behind Dog Years

In 2019, UC San Diego researchers discovered that the accurate conversion formula is human age = 16 × ln(dog age) + 31. Dogs age very rapidly in year one then slow considerably. Breed size adds an offset based on body mass.

🔬 Formula

human_age = 16 × ln(dog_age) + 31. Offsets: Small −2 to −5 yrs. Large +2 to +5. Giant +5 to +12.

📊 Chart