Pick your puppy's breed to predict their adult size and get breed-specific care info.
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Wondering how big your puppy will get? Our dogsize.co puppy weight calculator predicts your dog's adult weight and height with breed-specific accuracy. Simply enter your puppy's breed, current weight, age, and gender—and switch between lbs and kgs in seconds.
The calculations are powered by veterinary growth curves and anchored to the American Kennel Club (AKC) breed standards, ensuring predictions align with recognised size ranges used by vets and breeders worldwide. Our tool has been built by a data scientist to deliver results that are as accurate and reliable as possible for purebred and mixed-breed puppies alike.
For added reassurance, book your puppy's first free vet checkup with a trusted local vet to track their growth in person and get personalised nutrition and care advice.
Try our puppy weight calculator today!
Note: Please don't feed your dog more or less based on the results. For feeding and growth advice, always consult your veterinarian.
| Size class | Typical adult weight | Full size by |
|---|---|---|
| Toy | Up to 12 lbs | 9–10 months |
| Small | 12–25 lbs | 9–12 months |
| Medium | 25–50 lbs | 12–15 months |
| Large | 50–90 lbs | 15–18 months |
| Giant | 90+ lbs | 18–24 months |
General ranges across breeds in each size class. For a prediction specific to your puppy's breed and current weight, use the calculator above.
Many factors can influence and impact a puppy's development stages. Understanding these helps you set realistic expectations and support healthy growth.
A puppy's adult size is primarily determined by their breed or breed mix. Typically, a puppy will not grow larger than their biggest parent; if both parents are similar in size, the puppy will most likely reach that size too.
Male dogs are generally bigger and heavier than females of the same breed. In small breeds the difference may be subtle; in large and giant breeds it’s often more pronounced.
Desexing can influence growth by affecting hormonal development, especially if done very early. When performed at the appropriate time for the breed, it should not have a major impact on adult size and remains an important part of responsible pet care.
Overfeeding can lead to obesity and joint stress, while underfeeding may stunt growth. Feed a balanced, high-quality diet with appropriate protein, fats, vitamins, and minerals for your puppy's size class (e.g., large-breed formulas to moderate growth rate).
Chronic illnesses, genetic conditions, injuries, and parasites (like worms or ticks) can interrupt normal development and weight gain. Regular vet checks and preventive care help keep growth on track.
Too little activity can slow muscle and coordination development; too much high-impact exercise can strain growing joints. Age- and breed-appropriate exercise supports strong bones, muscles, and a healthy weight.
Puppy food portions are based on expected adult weight, not just current weight — feeding for the wrong endpoint can mean too few or too many calories during the growth window that matters most.
Crates, collars, and harnesses sized for a 15-lb puppy are useless a few months later if they're headed for 70 lbs. Knowing the target size means buying once, not three times.
A puppy tracking well outside their breed's expected curve — too fast or too slow — is worth a vet conversation. Without a baseline, it's hard to know what "off track" even looks like.
The calculator uses breed-specific growth curves and AKC adult weight ranges to produce a realistic estimate. For most puppies, the prediction falls within a sensible range, but individual variation (±10–15%) is normal.
You’ll need your puppy’s breed (or best guess for mixes), current weight, age in weeks (or days), and gender. Optional inputs like parent weights can improve accuracy for mixed breeds.
Yes. Select the closest breed match or use the "mixed breed" option and enter the expected adult size category (toy, small, medium, large, giant). The tool will apply general growth curves for that size band.
AKC standards represent ideal ranges for purebreds. Your puppy may fall outside these if they’re a mix, have atypical parent sizes, or are still in a rapid growth phase. The calculator blends breed data with your puppy’s current measurements to refine the estimate.
Small breeds often reach adult size by 9–12 months, medium breeds by 12–15 months, and large/giant breeds can take 18–24 months to fully mature. Height typically stabilises before weight and muscle fill out.
No. Use the result as a planning guide (e.g., crate size, expected adult weight), but always follow your vet’s feeding recommendations. Rapid growth in large breeds, in particular, should be managed with appropriate large-breed puppy food.
If your puppy’s weight is consistently outside the expected range (especially by more than 15%), or if you notice sudden changes in appetite, energy, or stool quality, schedule a vet check to rule out underlying health or nutrition issues.
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