Newfoundland Puppy Weight Calculator

Calculate the adult weight for your Newfoundland. Just type your puppy’s current weight and age, and see how big your puppy gets.

Newfoundland Breed Profile & Growth Guide

Breed Overview

The Newfoundland, affectionately known as the “gentle giant” of the dog world, originated in Newfoundland, Canada. Originally bred to help fishermen haul nets and rescue people from icy waters, this breed is strong, hardworking, and an exceptional swimmer. Their thick, water-resistant double coat and webbed feet are a testament to their working roots.

Newfoundlands are known for their calm temperament, patience with children, and deep loyalty. They make excellent family companions and are often described as sweet-natured and affectionate. However, due to their size and strength, early training and socialization are key.

Size Category: Giant
Newfoundlands fall into the giant breed category. Adult males typically weigh 130–150 lbs, and females range from 100 to 120 lbs. Because giant breeds like the Newfoundland grow for a longer time and have specific orthopedic risks, tracking their growth is vital to ensure safe, balanced development and to prevent joint issues like hip or elbow dysplasia.

Newfoundland Growth Chart & Weight Ranges

Age	Male Weight (lbs)	Female Weight (lbs)
4 weeks	9 – 13	8 – 12
8 weeks	20 – 25	18 – 23
3 months	40 – 50	35 – 45
4 months	55 – 65	50 – 60
6 months	75 – 90	65 – 80
9 months	95 – 115	85 – 100
12 months	110 – 130	95 – 115
18 months	125 – 145	105 – 120
24 months	130 – 150	100 – 120

Gender Differences:
Males are generally 10–30 pounds heavier than females and appear larger overall with broader heads and frames.

How Much Bigger Will My Newfoundland Puppy Get?

Newfoundlands grow rapidly in their first year and can reach around 50% of their adult weight by 5–6 months. However, they continue filling out until 18–24 months, especially males. Some dogs may not reach their full adult size until closer to 2.5 years.

Rule of Thumb:
A rough estimate of adult size is to double your Newfoundland puppy’s weight at 16 weeks.

Note:
As a giant breed, they have extended growth periods. Avoid overfeeding or overexercising during this time, as their joints and bones are still forming.

For more breed-specific health info, visit the Newfoundland Club of America or the AKC breed page.

Newfoundland Growth Tips

Nutrition

• Feed a giant breed puppy formula designed for slow, steady growth.
• Overfeeding can lead to rapid weight gain, increasing the risk of orthopedic issues.
• Feed 3–4 smaller meals per day until 6 months, then gradually shift to 2 meals daily.
• Avoid calcium supplements unless advised by a vet—imbalances can harm skeletal development.

Exercise

• Provide gentle exercise like walks and swimming; avoid jumping or high-impact activities.
• Swimming is ideal for Newfoundlands—low-impact and a natural fit for their abilities.
• Overexertion can damage growing joints, so limit rough play, stairs, or prolonged runs.

Health Watch

Newfoundlands are prone to certain growth and weight-related conditions, including:

• Hip and elbow dysplasia
• Osteochondritis dissecans (OCD)
• Panosteitis (growing pains)
• Obesity, which can lead to arthritis and heart problems