How Big Will My Boston Terrier Get?
Boston Terriers are a small breed that typically weigh 5–11 kg (11–24 lbs) at full size. Small breeds typically reach their adult weight around 10–12 months of age.
Boston Terrier Size at a Glance
Adult Weight
5–11 kg
11–24 lbs
Adult Height
38–43 cm
15–17 in
Size Category
small
Fully Grown By
10–12 mo
Boston Terrier Growth Chart
Boston Terrier Weight by Age
Predict Your Boston Terrier Puppy's Adult Weight
Enter your puppy's current age and weight for a personalized prediction.
Open Weight CalculatorBoston Terrier Growth & Development
Small breeds typically reach their adult weight around 10–12 months of age. They grow quickly in the first few months and then level off.
A Boston Terrier's growth rate is fastest in the first 6 months of life. During this period, proper nutrition and regular vet checkups ensure your puppy stays on a healthy growth trajectory.
Factors that influence your Boston Terrier's adult size include genetics (parent size), nutrition quality, spay/neuter timing, and overall health. Males typically weigh 10–20% more than females.
Frequently Asked Questions
How big will my Boston Terrier puppy get?
A full-grown Boston Terrier typically weighs between 5–11 kg (11–24 lbs). Males tend to be on the larger end of the range while females are usually smaller.
When do Boston Terriers stop growing?
Small breeds typically reach their adult weight around 10–12 months of age. They grow quickly in the first few months and then level off. Individual dogs may reach their full size slightly earlier or later depending on genetics, diet, and overall health.
How much should a Boston Terrier puppy weigh at 12 weeks?
At 12 weeks, a Boston Terrier puppy typically weighs around 2.4–3.2 kg (5–7 lbs), which is roughly 30–40% of their adult weight.
How can I tell if my Boston Terrier puppy is the right weight?
Compare your puppy's weight to the growth chart above. A healthy Boston Terrier puppy should follow a steady growth curve. If your puppy's weight deviates significantly from the expected range, consult your veterinarian.
Learn More About Boston Terriers
Explore the full breed profile, find name ideas, or check ownership costs.