Boston Terriers measure between 15 and 17 inches (38 and 44 centimeters) in height. Their weight as adults varies between 10 and 25 pounds (4.5 and 11 kilograms). Throughout their lifetime, they progressively grow from 0.48 – 25 pounds (0.5 – 11 kilograms).
If you plan to get a Boston Terrier and want to monitor their weight, you should know the average standards.
This article explores the size of Boston Terriers by age and gender.
You will also learn what your Boson’s neck and chest measurements should be according to their length.
Boston Terrier Size
The average size of Boston Terriers is 16 inches (41 centimeters) in height and 20 pounds (9 kilograms) in weight. Females Boston Terriers are generally smaller than males.
How Big Are Adult Boston Terriers?
The full-grown Boston Terrier size is between 15–17 inches (38–44 centimeters). Their size depends on factors such as genetics and lifestyle.
Boston Terriers that suffer from genetic mutations, such as dwarfism, are smaller.
Male Boston Terrier Size
Male Boston Terriers measure between 16–17 inches ( 40.6–43.8 centimeters) in height and weigh between 15–25 pounds (6.8–11.3 kilograms).
Female Boston Terrier Size
Female Boston terriers measure between 15–16 inches (38.1–40.6 centimeters) in height and weigh between 10–20 pounds (4.5–9 kilograms).
How Big Is a Full-size Teacup Boston Terrier?
Teacup Boston Terriers weigh less than 5 pounds (2.2 kilograms) and measure less than 7 inches (17.8 centimeters) in height.
Teacup Boston Terriers are not popular because breeding Bostons this small is dangerous.
Some Boston Terrier mixes can remain teacup-sized, but they are not purebreds.
Boston Terrier Size Chart
Adult Boston Terriers fall into 4 size categories, which are different from the size classifications of other breeds:
- Small
- Medium
- Large
- Sizeable
Depending on the category they are in, their length, neck size, and chest size differ.
This table lists the measurements of Boston Terriers according to their size.
| Size | Boston Terrier Length | Boston Terrier Neck Size | Boston Terrier Chest Size |
| Small | 11 – 12 in (28 – 30 cm) | 10 – 11 in (25 – 28 cm ) | 16 – 19 in (38 – 48 cm) |
| Medium | 12 – 13 in (30 – 33 cm) | 12 – 13 in (30 – 33 cm) | 18 – 21 in (45 – 53 cm) |
| Large | 13 – 14 in (33 – 35 cm) | 13 – 14 in (33 – 35 cm) | 20 – 23 in (50 – 58 cm) |
| Sizeable | 14 – 15 in (35 – 38 cm) | 14 – 15 in (35 – 38 cm) | 22 – 25 in (56 – 63 cm) |
How Much Do Boston Terriers Weigh?
Adult Boston Terriers weigh between 10–25 pounds (4.5–11 kg). When they are born, they weigh about 0.48 pounds (0.22 kilograms). They reach 6.61 pounds (3 kilograms) by the time they are three months old. They are more than double in size when they get to 6 months old, as they can reach 14.33 pounds.
Not all Boston terriers weigh the same, even if they are the same age.
Boston Terriers’ weight is influenced by a number of factors:
- Genetic inheritance
- Quality of their food
- Amount of food
- Exercise
How Big Are Boston Terrier Puppies?
Boston Terrier puppies weigh 0.48 (0.22 kilograms) pounds at birth, on average. They reach an average weight of 23.17 pounds (10.75 kilograms) when they reach 12 months.
In the first part of their puppyhood, Bostons grow fast. After that, they put on smaller amounts of weight every month.
This table lists the weight of Boston Terriers by age.
| Age | Average Weight in Pounds | Average Weight in Kilograms |
| 0 (Birth) | 0.48 lbs | 0.22 |
| 1-month-old Boston Terrier | 2.53 lbs | 1.15 |
| 2-month-old Boston Terrier | 4.40 lbs | 2.00 |
| 3-month-old Boston Terrier | 6.61 lbs | 3.00 |
| 4-month-old Boston Terrier | 8.81 lbs | 4.00 |
| 5-month-old Boston Terrier | 12.12 lbs | 5.50 |
| 6-month-old Boston Terrier | 14.33 lbs | 6.50 |
| 7-month-old Boston Terrier | 16.09 lbs | 7.30 |
| 8-month-old Boston Terrier | 19.84 lbs | 9.00 |
| 9-month-old Boston Terrier | 20.94 lbs | 9.50 |
| 10-month-old Boston Terrier | 21.29 lbs | 9.75 |
| 11-month-old Boston Terrier | 22.05 lbs | 10.00 |
| 12-month-old Boston Terrier | 23.17 lbs | 10.75 |
When Are Boston Terriers Fully Grown?
Boston Terriers are fully grown when they are around 10 to 14 months old.
Boston Terriers are small or medium-sized. Small Boston terriers grow faster than medium-sized Boston Terriers.
The physical maturity of Boston Terriers is not the same as their emotional maturity. A fully-grown Boston Terrier can act like a puppy, even if they have finished growing.
Boston Terrier Growth Chart
Boston Terriers go through 5 growth stages before they become adults. While their weight can be approximated, their size during these stages differs among individuals.
The 5 growth stages of Boston terriers before reaching adulthood are:
- The neonatal stage
- The transitional stage
- The socialization stage
- The juvenile stage
- The adolescence stage
This table lists the weight of Boston Terriers according to their growth stage.
| Growth Stage | Period | Weight in Pounds | Weight in Kilograms |
| Neonatal stage | 0 – 2 weeks | 0.48 – 1.50 | 0.22 – 0.68 |
| Transitional period | 2 – 3 weeks | 1.50 – 2.00 | 0.68 – 0.90 |
| Socialization period | 3 – 12 weeks | 2.00 – 6.61 | 0.90 – 3.00 |
| Juvenile period | 3 – 6 months | 6.61 – 14.33 | 3.00 – 6.50 |
| Adolescence | 6 – 18 months | 14.33 – 25.00 | 4.50 – 11.33 |
Boston Terrier Size Comparison
Boston Terriers are relatively small compared to the most popular breeds in the United States.
This is an advantage as smaller dogs are easier to transport. They also eat less, need less space, and are better suited for apartment living.
This table illustrates the size of Boston Terriers compared to the 10 most popular breeds in the United States.[?]
| Breed | Height in Inches | Weight in pounds | Height in Centimeters | Weight in Kilograms |
| Boston Terrier | 9 – 17 | 8 – 25 | 38 – 43 | 4.5 – 11 |
| Labrador Retriever[?] | 21.5 – 24.5 | 55 – 70 | 55 – 62 | 25 – 32 |
| French Bulldog | 12 | 16 – 28 | 30.5 | 7 – 13 |
| Golden Retriever[?] | 21.5 – 24 | 55 – 75 | 55 – 61 | 25 – 34 |
| German Shepherd[?] | 22 – 26 | 55 – 90 | 56 – 66 | 25 – 41 |
| Poodle (Standard) | Over 15 | 40 – 70 | over 38 | 18 – 32 |
| Bulldog[?] | 14 – 15 | 40 – 50 | 36 – 38 | 18 – 23 |
| Beagle | 13 -15 | 20 – 30 | 33 – 38 | 9 – 14 |
| Rottweiler | 22 – 24 | 80 – 135 | 56 – 63.5 | 36 –61 |
| German Shorthaired Pointer | 21 – 25 | 45 – 70 | 53 – 63.5 | 20 –32 |
| Dachshund (Standard) | 8 – 9 | 16 – 32 | 20 – 23 | 7 – 14.5 |
Conclusion
Boston Terriers are small or medium-sized dogs. At birth, they weigh 0.48 pounds (22 kilograms). Fully-grown Boston Terriers weigh between 10 and 25 pounds (4.5 – 11 kilograms) and are between 15 and 17 inches (38 and 44 centimeters) tall.
Their size is influenced by nutrition, lifestyle, and genetics.
