Saint Bernard Growth Chart: Puppy Weight by Month

Saint Bernard puppy weight chart (lb)

Adult weight	2 mo	3 mo	4 mo	5 mo	6 mo	8 mo	10 mo	12 mo	15 mo	18 mo
Male, 140 lb	19	32	47	61	73	93	110	120	132	137
Male, 180 lb	24	40	60	78	94	120	141	155	169	176
Female, 120 lb	16	27	40	52	62	80	94	103	113	118
Female, 140 lb	19	32	47	61	73	93	110	120	132	137

Saint Bernard puppy weight chart (kg)

Adult weight	2 mo	3 mo	4 mo	5 mo	6 mo	8 mo	10 mo	12 mo	15 mo	18 mo
Male, 64 kg	8.5	14	21	28	33	42	50	55	60	62
Male, 82 kg	11	18	27	35	42	54	64	70	77	80
Female, 54 kg	7.3	12	18	24	28	36	43	47	51	53
Female, 64 kg	8.5	14	21	28	33	42	50	55	60	62

Typical weights by month. Individual puppies often sit 10–15% above or below these numbers. Last reviewed October 7, 2026.

How big does a Saint Bernard get?

According to the American Kennel Club's breed profile for the St. Bernard, adults weigh: male 140–180 lb; female 120–140 lb. Life expectancy is 8–10 years.

	Weight	Height
Male	140–180 lb	28–30 in
Female	120–140 lb	26–28 in

When does a Saint Bernard stop growing?

Saint Bernards grow like other giant-sized dogs: they are close to adult weight at around 18 months. At 6 months a typical Saint Bernard puppy has reached about 52% of its adult weight.

To estimate your own puppy's adult weight from its current weight and age, use the puppy weight calculator and choose "Giant" as the expected adult size.

How the chart is made

The adult weights come from the AKC breed profile. The weight at each month is estimated with our giant-breed growth curve, which gives the share of adult weight a typical puppy of that size reaches at each age. The curves are simplified from published research on dog growth, including the growth standard charts by Salt and colleagues (PLOS ONE, 2017).

If your puppy is well below or above the chart, stops gaining weight, or looks very thin or round, ask your vet to check its body condition.

Saint Bernard puppy growth chart: typical weight by month — Save this chart for later or share it with a friend.

Questions people ask

How much should a 3-month-old Saint Bernard weigh?

Typically about 27–40 lb, depending on sex and how big the dog will be as an adult.

How much should a 6-month-old Saint Bernard weigh?

Typically about 62–94 lb, roughly 52% of adult weight.

When is a Saint Bernard full grown?

Most Saint Bernards are close to their adult weight at around 18 months, though many keep filling out with muscle for a while after that.

How big will my Saint Bernard get?

The AKC lists adult weights of male 140–180 lb; female 120–140 lb. Your puppy's parents are a good guide to where in that range it will end up.

Saint Bernard growth chart