Saint Bernard age in human years

Saint Bernards are a giant breed. Here is the full age chart and what each stage means.

Updated October 2026Numbers calculated for this page

Saint Bernards are a giant breed (typically 120–180 lb), so they age about 7 human years for every dog year after age two. A 5-year-old Saint Bernard is about 45 in human years, and the senior years usually start around age 7.

8–10 yrstypical life expectancy

80human years at age 10

~7senior years begin

120–180 lbtypical adult weight

Saint Bernard age chart

Dog age	Human years	Life stage
1 year	15	Young adult
2 years	24	Young adult
3 years	31	Mature adult
4 years	38	Mature adult
5 years	45	Mature adult
6 years	52	Mature adult
7 years	59	Senior
8 years	66	Senior
9 years	73	Senior
10 years	80	Golden years
11 years	87	Golden years
12 years	94	Golden years

Uses the common size-based chart: the first year equals about 15 human years, the second adds about 9, and each year after that adds 4 (small), 5 (medium), 6 (large) or 7 (giant). It is an estimate, not a medical measure.

What each stage means for a Saint Bernard

Young adult (1–3): still learning. Keep training consistent and set the healthy weight now; for a Saint Bernard that is usually within 120–180 lb.
Mature adult (3–6): yearly checkups, dental care and steady exercise. Watch the waistline as activity drops.
Senior (7+): many vets suggest checkups every six months, plus attention to joints, teeth and weight changes.

How much a Saint Bernard eats

A spayed or neutered adult around 150 lb needs roughly 2,650 calories a day, about 7.0 cups of a typical 380-calorie-per-cup dry food. See the full feeding guide for a 150 lb dog.

Planning the budget? See what a Saint Bernard costs per year.

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Other giant breeds

Rottweiler Cane Corso Great Dane Mastiff Newfoundland Bullmastiff Irish Wolfhound Leonberger Anatolian Shepherd Dogue de Bordeaux

Any giant dog: see how old a 7-year-old giant dog is or try the dog age calculator.

Questions people ask

How old is a 10-year-old Saint Bernard in human years?

About 80, using the giant-breed chart.

How long do Saint Bernards live?

Typically 8 to 10 years, though genetics, weight, diet and vet care all matter.

When is a Saint Bernard considered a senior?

Around age 7, roughly the last quarter of the breed's typical lifespan.

The Paw Plan shares general pet care information, not veterinary advice. Figures on this page are estimates calculated from the assumptions shown. Every pet is different, so check with your vet about yours.