Puppy Weight Calculator
Predict how big your puppy will get. Estimate your dog's adult weight from its breed, current weight, age and sex, with a growth chart.
Predict your puppy's adult weight in seconds and track their growth.
How the puppy weight calculator works
Wondering how big your puppy will get? This calculator predicts your dog's adult weight using its breed, current weight, age and sex. It compares your puppy's weight against a breed-specific growth curve based on American Kennel Club adult weight standards, then constrains the estimate to the healthy range for the breed.
Puppy growth chart by breed size
Predicting growth isn't an exact science, but these average ranges are a reliable guide for each size group:
| 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 |
| 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 |
What else influences how big a puppy grows?
Genetics (a puppy rarely grows bigger than its largest parent), sex (males are usually a little larger), spay/neuter timing, nutrition, health issues and exercise levels all play a part. Use the estimate to plan nutrition, gear and vet care — never to over- or under-feed your dog.
FAQs
A puppy weight calculator is a helpful guide, but it can't be 100% accurate for every dog. It can't fully account for individual variation in growth, genetics and nutrition. Use it as an estimate and confirm growth with your vet.
A common rule of thumb is that small breeds triple their 8-week weight, while medium and large breeds roughly double their weight at 16 weeks. This calculator refines that with a breed-specific growth curve and the breed's known adult weight range.
Genetics, sex, the timing of spaying or neutering, diet, pre-existing health conditions and exercise habits all influence a puppy's growth. A puppy will rarely grow larger than its biggest parent.
Paw size is only a rough indicator. Very large paws can suggest a bigger adult size, but this isn't reliable on its own. Breed, parentage and a growth curve give a much better estimate.
Yes. Mixed-breed dogs inherit traits from two or more breeds, so their adult size is harder to predict. As a guide, using the medium–large rule (doubling weight at 16 weeks) usually gives a reasonable estimate.
Toy, small and medium dogs usually reach their adult size by 9–12 months. Large breeds can take 12–18 months, and giant breeds may keep growing for up to 24 months.
Weigh your puppy regularly — weekly or monthly — especially during the first 6–12 months when they grow fastest. Track the trend rather than a single number, and bring any concerns to your vet.
