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Puppy Age Calculator

Calculate your puppy's age in weeks, months, and human years — and see which development stage they're in.

🐶 Calculate Your Puppy's Age

Enter your puppy's birth date and expected adult size to see their exact age, development stage, and next milestone

🐶 Puppy's Birth Date

Birth Month

Birth Day

Birth Year

🐶 Puppy Profile

Expected Adult Size

📊 Your Puppy's Age

Summary

Age in Weeks

Age in Months

Human Years

Development Stage

Next Milestone

Adult Size Class

⚙️How It Works

This calculator converts your puppy's age into weeks, months, and human-equivalent years using widely used guidelines:

Weeks and months — the units vets and breeders actually use to track puppy development.
Human years — the first year of a dog's life equals roughly 15 human years, the second year adds about 9 more, and each year after that adds 4 to 7 human years depending on breed size.
Development stages — from newborn to young adult, your puppy's stage follows the standard puppy growth timeline.

Small breeds mature faster than large and giant breeds, so the expected adult size you select is used for the human-years conversion and the adult size class.

📋Puppy Development Timeline

Puppies develop quickly. Here is the typical timeline of puppy stages and what to expect at each one.

Age	Stage	Key Milestones
0–2 weeks	Newborn	Eyes closed, ears folded, nursing, sleeping most of the day.
2–4 weeks	Transitional	Eyes open, first wobbly steps, first baby teeth, starts responding to sounds.
4–12 weeks	Socialization	Weaning begins, vaccinations start, house training and basic commands, play with littermates.
3–6 months	Juvenile	Teething (chewing everything), basic obedience, adult teeth start coming in.
6–12 months	Adolescent	Adult teeth fully in, energy peaks, boundary testing, training consistency matters.
1–2 years	Young Adult	Calmer, full size (small breeds mature earlier), solid training foundation.

💡Why It Matters

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Age in Weeks & Months

See your puppy's age in the units vets and breeders actually use.

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Human Years Equivalent

Understand your puppy's life stage compared to a human's.

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Know the Stages

From newborn to young adult — know what to expect at every phase.

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Milestone Planning

Time vaccinations, training, and vet visits to your puppy's stage.