Dog Size and Weight Calculator

Bringing a new puppy home is exciting, but calculating its growth and needs is crucial. A dog size calculator helps predict your puppy’s adult size and weight using factors like current weight and age. Predicting growth as it sits in planning food, and space making it a valuable tool for pet owners.

Stages of the Dog Development

Dogs go through several stages of development as they grow from puppies to mature adults. Understanding these stages ensures you meet their changing physical, emotional, and social needs.

Growth Stage Time Period (Months) Average Weight Example Weight (kg)
Neonatal Stage 0 - 2 Weeks 5 - 10% 1.5 - 3 kg
Transitional Stage 2 - 4 Weeks 10 - 20% 3 - 6 kg
Socialization Stage 1 - 3 Months 20 - 40% 6 - 12 kg
Juvenile Stage 3 - 6 Months 40 - 70% 12 - 21 kg
Early Adolescence 6 - 9 Months 70 - 90% 21 - 27 kg
Late Adolescence 9 - 12 Months 90 - 100% 27 - 30 kg
Young Adulthood 1 - 2 Years Full Adult Size 30 kg
Adulthood 2 - 7 Years Stable Weight 30 kg
Senior Stage 7+ Years Lose or Gain Varies (28 - 32 kg)

Calculating Dog Size and Weight

Our how big will my puppy get calculator uses the following equation: Adult weight = (Current weight / Current Age) × 52.

Current weight: The current weight of the puppy, Current Age: The age of the puppy in week/month, Number 52: That’s how we program the dog size predictor to give us your puppy’s weight when it is exactly 1 year old.

Example 1:
Small Breed Puppy; Puppy weight: 4 pounds, Puppy age: 10 weeks.
Divide the puppy’s weight by its age in weeks: 4/10 = 0.4.

Multiply this result by 52.
Your dog’s adult weight should fall into this range: 8.49-10.38 kg. Your pet’s going to be a Small dog 🐶

Example 2:
Small Breed Puppy; Puppy weight: 20 pounds, Puppy age: 12 weeks.
Divide the puppy’s weight by its age in weeks: 20/12 = 1.67.

Multiply this result by 52.
Your dog’s adult weight should fall into this range: 35.38-43.24 kg.
Your pet’s going to be a Large dog 🐶

Use a scale to find the dog’s exact weight in pounds or kilograms. Find the age of the puppy (weeks or months). Input the value into the calculator to predict adult weight.

Dog and their adult weight & size

According to your puppy weight calculator’s results, we can place your dog into one of 5 major breed size groups:

Breed Size Breed Example Puppy Weight Adult Weight Growth Period
Toy Pomeranian 1–2 lbs 3–7 lbs 9–12 months
Small Chihuahua 2 lbs 4–6 lbs 9–12 months
Medium Beagle 6 lbs 20–30 lbs 12 months
Large Labrador Retriever 12 lbs 55–80 lbs 12–18 months
Giant Great Dane 20 lbs 120–175 lbs 18–24 months

Your dogs height depends mostly on its breed. However you can predict its maximum possible height from paws to shoulders using this dog height chart.

Breed Size Max Height Max Height Average Weight Life Expectancy Common Breeds
Toy 12 in 30.5 cm 3–7 lbs 12–16 years Pomeranian
Small 18 in 45.7 cm 4–20 lbs 10–15 years Beagle
Medium 25 in 63.5 cm 20–50 lbs 10–13 years Bulldog
Large 30 in 76.2 cm 50–100 lbs 8–12 years Golden Retriever
Giant 44 in 111.8 cm 100–200 lbs 6–10 years Great Dane
1. Is a 20 kilogram dog a big dog?

A 20 kg dog is generally considered as a medium to large dogs. If your dog is medium sized dog, 20 kg is at the higher end of their weight. If your dog is a large breed 20 kg is considered small.

To calculate your dogs size: calculate age in weeks, calculate weight (pounds or kg). Now use the formula: Adult weight = (Puppy weight / Puppy age in weeks) × 52.

A 10 kg dog (approximately 22 pounds ) is generally considered a small to medium-sized dog. 

Yes, 40 kg is generally considered heavy for a Labrador. Here is the typical weight range for a Labrador: Male Labrador : 29–36 kg (65–80 pounds) and Female Labrador : 25–32 kg (55–70 pounds).