Boston Terrier weight by age
Typical weight by age for a Boston Terrier with an adult weight of about 18 lb (male) or 18 lb (female). The range shows where most puppies fall.
| Age | Male | Female |
|---|---|---|
| 2 months | 4.9 lbrange 3.4–6.6 lb | 4.9 lbrange 3.4–6.6 lb |
| 3 months | 7.3 lbrange 5.3–9.5 lb | 7.3 lbrange 5.3–9.5 lb |
| 4 months | 9.8 lbrange 7.5–12 lb | 9.8 lbrange 7.5–12 lb |
| 5 months | 12 lbrange 9.8–15 lb | 12 lbrange 9.8–15 lb |
| 6 months | 14 lbrange 11–16 lb | 14 lbrange 11–16 lb |
| 8 months | 16 lbrange 13–18 lb | 16 lbrange 13–18 lb |
| 10 months | 17 lbrange 14–19 lb | 17 lbrange 14–19 lb |
| 12 months | 18 lbrange 15–19 lb | 18 lbrange 15–19 lb |
Divide pounds by 2.2 for kilograms.
Adult weight
AKC breed page: 12-25 pounds. The calculator uses about 18 lb for males and 18 lb for females as the typical adult weight.
Common questions
How much should a Boston Terrier puppy weigh at 3 months?
A typical male Boston Terrier weighs about 7.3 lb at 3 months (most between 5.3 and 9.5 lb). A typical female weighs about 7.3 lb (most between 5.3 and 9.5 lb).
How much should a Boston Terrier puppy weigh at 6 months?
A typical male Boston Terrier weighs about 14 lb at 6 months (most between 11 and 16 lb). A typical female weighs about 14 lb (most between 11 and 16 lb).
How much does a Boston Terrier weigh at 1 year?
A typical male Boston Terrier weighs about 18 lb at 12 months (most between 15 and 19 lb). A typical female weighs about 18 lb (most between 15 and 19 lb).
When does a Boston Terrier stop gaining weight?
The typical Boston Terrier puppy reaches about 90% of its adult weight around 10 months. The last few percent come on slowly after that. Large and giant breeds fill out for longer than small ones.
How accurate is the Boston Terrier weight calculator?
Across our test dogs the typical miss was about 11% of adult weight, smaller for older puppies. Your puppy can land outside the range. See the methods page.
Other breeds
Weight standard: AKC breed page. Growth curves: our analysis of open data from Salt et al. (2017), CC BY 4.0. An estimate, not veterinary advice. Methods.