Newfoundland age in human years

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

Updated October 2026Numbers calculated for this page

Newfoundlands are a giant breed (typically 100–150 lb), so they age about 7 human years for every dog year after age two. A 5-year-old Newfoundland is about 45 in human years, and the senior years usually start around age 7.

9–10 yrstypical life expectancy

80human years at age 10

~7senior years begin

100–150 lbtypical adult weight

Newfoundland 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	Mature adult
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 Newfoundland

Young adult (1–3): still learning. Keep training consistent and set the healthy weight now; for a Newfoundland that is usually within 100–150 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 Newfoundland eats

A spayed or neutered adult around 125 lb needs roughly 2,310 calories a day, about 6.1 cups of a typical 380-calorie-per-cup dry food. See the full feeding guide for a 125 lb dog.

Planning the budget? See what a Newfoundland costs per year.

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Other giant breeds

Rottweiler Cane Corso Great Dane Mastiff Saint Bernard 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 Newfoundland in human years?

About 80, using the giant-breed chart.

How long do Newfoundlands live?

Typically 9 to 10 years, though genetics, weight, diet and vet care all matter.

When is a Newfoundland 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.