How Big Will My Saint Bernard Get?
Saint Bernards are a giant breed that typically weigh 54–82 kg (119–181 lbs) at full size. Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months.
Saint Bernard Size at a Glance
Adult Weight
54–82 kg
119–181 lbs
Adult Height
65–90 cm
26–35 in
Size Category
giant
Fully Grown By
18–24 mo
Saint Bernard Growth Chart
Saint Bernard Weight by Age
Predict Your Saint Bernard Puppy's Adult Weight
Enter your puppy's current age and weight for a personalized prediction.
Open Weight CalculatorSaint Bernard Growth & Development
Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months. They have an extended growth period that requires careful nutrition management.
A Saint Bernard's growth rate is fastest in the first 6 months of life. For larger breeds like the Saint Bernard, it's important not to over-feed during the growth phase, as rapid weight gain can put stress on developing joints and bones.
Factors that influence your Saint Bernard's adult size include genetics (parent size), nutrition quality, spay/neuter timing, and overall health. Males typically weigh 10–20% more than females.
Frequently Asked Questions
How big will my Saint Bernard puppy get?
A full-grown Saint Bernard typically weighs between 54–82 kg (119–181 lbs). Males tend to be on the larger end of the range while females are usually smaller.
When do Saint Bernards stop growing?
Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months. They have an extended growth period that requires careful nutrition management. Individual dogs may reach their full size slightly earlier or later depending on genetics, diet, and overall health.
How much should a Saint Bernard puppy weigh at 12 weeks?
At 12 weeks, a Saint Bernard puppy typically weighs around 20.4–27.2 kg (45–60 lbs), which is roughly 30–40% of their adult weight.
How can I tell if my Saint Bernard puppy is the right weight?
Compare your puppy's weight to the growth chart above. A healthy Saint Bernard puppy should follow a steady growth curve. If your puppy's weight deviates significantly from the expected range, consult your veterinarian.
Learn More About Saint Bernards
Explore the full breed profile, find name ideas, or check ownership costs.