Bullmastiff weight by age
Typical weight by age for a Bullmastiff with an adult weight of about 120 lb (male) or 110 lb (female). The range shows where most puppies fall.
| Age | Male | Female |
|---|---|---|
| 2 months | 19 lbrange 13–25 lb | 17 lbrange 12–23 lb |
| 3 months | 32 lbrange 23–41 lb | 29 lbrange 21–38 lb |
| 4 months | 47 lbrange 36–59 lb | 43 lbrange 33–54 lb |
| 5 months | 64 lbrange 52–78 lb | 59 lbrange 47–71 lb |
| 6 months | 76 lbrange 62–90 lb | 70 lbrange 56–82 lb |
| 8 months | 95 lbrange 80–109 lb | 87 lbrange 73–100 lb |
| 10 months | 104 lbrange 88–116 lb | 95 lbrange 80–107 lb |
| 12 months | 109 lbrange 95–120 lb | 100 lbrange 87–110 lb |
Divide pounds by 2.2 for kilograms.
Adult weight
AKC breed page: 110-130 pounds (male), 100-120 pounds (female). The calculator uses about 120 lb for males and 110 lb for females as the typical adult weight.
Common questions
How much should a Bullmastiff puppy weigh at 3 months?
A typical male Bullmastiff weighs about 32 lb at 3 months (most between 23 and 41 lb). A typical female weighs about 29 lb (most between 21 and 38 lb).
How much should a Bullmastiff puppy weigh at 6 months?
A typical male Bullmastiff weighs about 76 lb at 6 months (most between 62 and 90 lb). A typical female weighs about 70 lb (most between 56 and 82 lb).
How much does a Bullmastiff weigh at 1 year?
A typical male Bullmastiff weighs about 109 lb at 12 months (most between 95 and 120 lb). A typical female weighs about 100 lb (most between 87 and 110 lb).
When does a Bullmastiff stop gaining weight?
The typical Bullmastiff puppy reaches about 90% of its adult weight around 12 months and 95% around 18 months. Large and giant breeds fill out for longer than small ones.
How accurate is the Bullmastiff 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
- Anatolian Shepherd Dog
- Dogue de Bordeaux
- Greater Swiss Mountain Dog
- Irish Wolfhound
- Newfoundland
- Leonberger
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.