Mastiff weight by age
Typical weight by age for a Mastiff with an adult weight of about 195 lb (male) or 145 lb (female). The range shows where most puppies fall.
| Age | Male | Female |
|---|---|---|
| 2 months | 31 lbrange 21–41 lb | 23 lbrange 15–30 lb |
| 3 months | 52 lbrange 38–67 lb | 39 lbrange 28–50 lb |
| 4 months | 76 lbrange 59–95 lb | 57 lbrange 44–71 lb |
| 5 months | 104 lbrange 84–126 lb | 78 lbrange 62–94 lb |
| 6 months | 124 lbrange 100–146 lb | 92 lbrange 74–109 lb |
| 8 months | 154 lbrange 129–177 lb | 115 lbrange 96–132 lb |
| 10 months | 169 lbrange 142–189 lb | 125 lbrange 106–141 lb |
| 12 months | 177 lbrange 154–196 lb | 132 lbrange 114–146 lb |
Divide pounds by 2.2 for kilograms.
Adult weight
AKC breed page: 160-230 pounds (male), 120-170 pounds (female). The calculator uses about 195 lb for males and 145 lb for females as the typical adult weight.
Common questions
How much should a Mastiff puppy weigh at 3 months?
A typical male Mastiff weighs about 52 lb at 3 months (most between 38 and 67 lb). A typical female weighs about 39 lb (most between 28 and 50 lb).
How much should a Mastiff puppy weigh at 6 months?
A typical male Mastiff weighs about 124 lb at 6 months (most between 100 and 146 lb). A typical female weighs about 92 lb (most between 74 and 109 lb).
How much does a Mastiff weigh at 1 year?
A typical male Mastiff weighs about 177 lb at 12 months (most between 154 and 196 lb). A typical female weighs about 132 lb (most between 114 and 146 lb).
When does a Mastiff stop gaining weight?
The typical Mastiff 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 Mastiff 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.