Boston Terrier Puppy Weight Calculator

Calculate the adult weight for your Boston Terrier. Just type your puppy’s current weight and age, and see how big your puppy gets.

Boston Terrier Breed Profile and Growth Guide

Breed Overview

The Boston Terrier, often referred to as the “American Gentleman,” is a charming and intelligent companion dog that originated in the United States in the late 19th century. Bred from a mix of the English Bulldog and the now-extinct White English Terrier, this breed was initially developed for fighting but quickly became a beloved family pet due to its friendly nature and manageable size.

Boston Terriers are sociable, affectionate, and full of personality. They typically get along well with children and other pets and are known for their expressive eyes, tuxedo-like markings, and playful demeanor. Though they are small, their sturdy build and spunky energy make them adaptable to a variety of living situations—from apartments to larger homes.

Size category: Small
Boston Terriers are considered a small breed, typically weighing between 12 and 25 pounds as adults. Growth tracking is important to ensure they develop at a healthy rate without becoming underweight or overweight, both of which can lead to health issues in this compact breed.

Boston Terrier Growth Chart & Weight Ranges

Boston Terrier puppies grow quickly in their first year. The table below offers average weight ranges based on age and gender:

Age	Male Weight Range (lbs)	Female Weight Range (lbs)
4 weeks	2 – 3	1.5 – 2.5
8 weeks	4 – 5.5	3.5 – 5
3 months	6 – 8	5 – 7
4 months	7.5 – 10	6.5 – 9
6 months	10 – 13	9 – 12
9 months	12 – 16	11 – 14
12 months	13 – 18	12 – 16

Note: Males typically weigh 1–3 lbs more than females at full maturity.

How Much Bigger Will My Boston Terrier Puppy Get?

Boston Terriers experience most of their growth during the first 6 months. By the time they are 6 months old, many have reached around 75%–80% of their adult weight. Full physical maturity usually occurs between 10 to 12 months, although some may fill out slightly up to 14 months.

Rule of Thumb:
To estimate adult size, double your Boston Terrier’s weight at 16 weeks. While not precise, it provides a useful ballpark figure.

Unlike larger breeds, Boston Terriers do not have extended growth phases beyond the 1-year mark.

Boston Terrier Growth Tips

Nutrition

• Feed a high-quality small-breed puppy food formulated for their energetic nature and rapid growth.
• Stick to 3–4 meals per day for puppies under 6 months, then transition to 2 meals per day into adulthood.
• Avoid overfeeding—Boston Terriers are prone to obesity, which can strain their joints and respiratory system.

Exercise

• Boston Terrier puppies have moderate exercise needs. Daily playtime and short walks are ideal.
• Be cautious of extreme heat or cold, as their short snouts (brachycephalic) make it harder for them to regulate body temperature.
• Mental stimulation is just as important—use puzzle toys, training, and games.

Health Watch

• Monitor for signs of brachycephalic airway syndrome, which can affect breathing in flat-faced breeds.
• Eye injuries or irritation are also common due to their prominent eyes—keep their face clean and visit the vet if irritation appears.
• Ensure they stay within a healthy weight range to avoid added stress on joints and organs.