How Accurate Are Puppy Weight Calculators?

An estimate puppy weight calculator is a helpful guide, but it isn’t going to be 100% accurate for everyone. It can’t always factor in individual variations in growth and development.

How Often Should I Weigh My Puppy Using a Puppy Size Calculator?

You can use our puppy dog size calculator between Sydney, NSW vet visits. Monitor their growth regularly (weekly or monthly), especially during the first 6-12 months when they are growing so fast.

How Big Will My Puppy Get?

The standard formula for estimating adult size is that small breeds triple their weight at 8 weeks, and medium-large breeds double their weight at 16 weeks.

What Factors Affect Puppy Growth Rate?

Many things can influence your puppy’s growth trajectory, including genetics, gender, the timing of desexing, diet, pre-existing health conditions, and exercise habits.

Can a Puppy’s Paw Size Determine Their Final Size?

Paw size is only a rough indicator of adult size. While very large paws can suggest a big size once fully grown, this is not always the case.

Do Mixed-Breed Puppies Grow Differently?

Yes, and it can be difficult for a dog size predictor to calculate the final size of a mixed-breed dog because they have inherited traits from at least two different breeds. Using the medium-large dog formula (doubling their weight at 16 weeks) will likely give you a good estimate.

When Do Puppies Stop Growing?

Toy, small and medium-sized dogs usually reach adult size by 9-12 months. Large breeds can take 12–18 months, whilst giant breeds can grow for up to 24 months.

How Accurate Are Puppy Weight Calculators?

An estimate puppy weight calculator is a helpful guide, but it isn’t going to be 100% accurate for everyone. It can’t always factor in individual variations in growth and development.

How Often Should I Weigh My Puppy Using a Puppy Size Calculator?

You can use our puppy dog size calculator between Sydney, NSW vet visits. Monitor their growth regularly (weekly or monthly), especially during the first 6-12 months when they are growing so fast.

How Big Will My Puppy Get?

The standard formula for estimating adult size is that small breeds triple their weight at 8 weeks, and medium-large breeds double their weight at 16 weeks.

What Factors Affect Puppy Growth Rate?

Many things can influence your puppy’s growth trajectory, including genetics, gender, the timing of desexing, diet, pre-existing health conditions, and exercise habits.

Can a Puppy’s Paw Size Determine Their Final Size?

Paw size is only a rough indicator of adult size. While very large paws can suggest a big size once fully grown, this is not always the case.

Do Mixed-Breed Puppies Grow Differently?

Yes, and it can be difficult for a dog size predictor to calculate the final size of a mixed-breed dog because they have inherited traits from at least two different breeds. Using the medium-large dog formula (doubling their weight at 16 weeks) will likely give you a good estimate.

When Do Puppies Stop Growing?

Toy, small and medium-sized dogs usually reach adult size by 9-12 months. Large breeds can take 12–18 months, whilst giant breeds can grow for up to 24 months.

Puppy Weight Calculator - Free Puppy’s Growth Chart Tool

Wondering how big your puppy will get? Our Sydney Animal Hospitals puppy dog weight calculator predicts your dog’s adult weight and height. Simply fill in your puppy’s breed, current weight, age, gender, and change to kgs.

The calculations are based on the American Kennel Club’s database of adult dog heights and weights. Our tool has been built by a data scientist to ensure results are as accurate as possible and align with the breed standards commonly used by Australian vets.

For added reassurance, book their first free puppy checkup with our experienced Sydney vet team to track their growth in person.

Try our puppy weight calculator today!

Note: Please don’t feed your dog more or less based on the results. For that advice, consult your veterinarian.

Age	Toy	Small	Medium	Large	Giant
8 weeks	0.9–1.8 kg	1.5–3 kg	3–5 kg	5–9 kg	7–12 kg
3 months	1.4–3 kg	3–5 kg	5–9 kg	9–15 kg	12-20 kg
4 months	2–4 kg	4–7 kg	8–13 kg	12–20 kg	18-28 kg
6 months	2.5–5 kg	5–9 kg	10–18 kg	18–30 kg	28-40 kg
1 year	3–5.5 kg	6–11 kg	11–23 kg	23–45 kg	45-70+ kg

Many factors can influence and impact a puppy’s development stages. These include:

Parents: Typically, a puppy will not be any larger than their biggest parent. If both parents are the same size, the puppy will most likely grow to that size too.
Gender: Male dogs are generally bigger than female dogs. In small breeds, the size difference may not be noticeable. In large breeds, it is often more prominent.
Desexing: Pet desexing (spaying or neutering) can influence a puppy’s growth because it may affect hormonal development. However, it is an important part of responsible pet care in NSW, and when performed at the appropriate time for the breed, it should not have a major influence on adult size.
Nutrition: Overfeeding can lead to obesity, while underfeeding may stunt growth. It’s important to follow good Australian pet nutrition practices by feeding your puppy a balanced diet of high-quality proteins, fats, vitamins, and minerals.
Health issues: Chronic illnesses, genetic conditions, injuries, and even parasites like ticks or worms can interrupt a puppy’s development.
Exercise levels: Too little activity can slow growth and coordination, while too much can strain growing joints. Age and breed-appropriate exercise will help puppies build strong muscles and bones and support a healthy weight.

Our puppy weight estimator calculator is a great way to help you plan your puppy’s current and future veterinary needs. It’s a handy tool for tracking their health at home, and it’s best paired with regular visits to your local NSW veterinary clinic.

Puppies should have their first check-up within the first week of coming home—around 6–8 weeks of age—then return every few weeks until around 16 weeks for growth assessments and immunisations. After that, milestone visits at 6 months of age and 1 year are recommended. These puppy care check-ups are vital for monitoring healthy growth and keeping on top of their dog vaccination schedule.

Download our PDF puppy health checklist to stay organised through every stage of their development.

Pair our puppy dog weight predictor with in-clinic vet checks for complete peace of mind

How Accurate Are Puppy Weight Calculators?
An estimate puppy weight calculator is a helpful guide, but it isn’t going to be 100% accurate for everyone. It can’t always factor in individual variations in growth and development.
How Often Should I Weigh My Puppy Using a Puppy Size Calculator?
You can use our puppy dog size calculator between Sydney, NSW vet visits. Monitor their growth regularly (weekly or monthly), especially during the first 6-12 months when they are growing so fast.
How Big Will My Puppy Get?
The standard formula for estimating adult size is that small breeds triple their weight at 8 weeks, and medium-large breeds double their weight at 16 weeks.
What Factors Affect Puppy Growth Rate?
Many things can influence your puppy’s growth trajectory, including genetics, gender, the timing of desexing, diet, pre-existing health conditions, and exercise habits.
Can a Puppy’s Paw Size Determine Their Final Size?
Paw size is only a rough indicator of adult size. While very large paws can suggest a big size once fully grown, this is not always the case.
Do Mixed-Breed Puppies Grow Differently?
Yes, and it can be difficult for a dog size predictor to calculate the final size of a mixed-breed dog because they have inherited traits from at least two different breeds. Using the medium-large dog formula (doubling their weight at 16 weeks) will likely give you a good estimate.
When Do Puppies Stop Growing?
Toy, small and medium-sized dogs usually reach adult size by 9-12 months. Large breeds can take 12–18 months, whilst giant breeds can grow for up to 24 months.

Puppy Dog Weight Calculator