⚖️ Dog Weight Calculator
Estimate your puppy's adult weight, or check whether your adult dog is within a healthy weight range for their size.
How Puppy Weight Estimates Work
The puppy adult weight estimate uses a simple growth curve formula: current weight divided by current age in weeks, multiplied by the expected maturity age for the breed size. Smaller breeds mature earlier (around 32–40 weeks); larger breeds continue growing until 18–24 months.
This formula is most accurate between 8 and 16 weeks of age. Very young puppies (under 8 weeks) and puppies already close to adult size will produce less reliable estimates. For mixed breeds, use the size category of the larger parent as your reference point.
Understanding the Healthy Weight Check
The healthy weight ranges in this tool are based on general size categories, not breed-specific standards. A dog's ideal weight depends on their frame and muscle composition — a lean, muscular dog and a small-framed dog of the same size category may have very different healthy weights.
The most reliable at-home check is the rib test: run your fingers along your dog's ribcage with light pressure. You should feel each rib easily without seeing them. If you have to press firmly to feel ribs, your dog may be overweight. If ribs are clearly visible without touching, they may be underweight.
Weight and Large Breed Health
For large and giant breeds, keeping weight in check during puppyhood is especially important. Overfeeding large-breed puppies accelerates bone growth and significantly increases the risk of hip dysplasia and other orthopedic conditions later in life. Large-breed puppy foods are specifically formulated with lower calcium and calorie density to support healthy, steady growth.
If Your Adult Dog Is Outside the Healthy Range
A single weigh-in outside the typical range isn't necessarily a problem — some dogs are naturally larger or leaner-framed than average for their breed. What matters more is the trend: steady weight gain or loss over a few months is worth mentioning at your dog's next vet visit, especially if it's unexplained by a diet or activity change you made intentionally.
See detailed weight charts by breed size → Puppy Weight Chart by Breed Size
Weight on the low end? → How to Tell If Your Dog Is Underweight
Older dog moving stiffly? Extra weight makes joint pain worse → Dog Arthritis Screening Tool
Frequently Asked Questions
Can it check an adult dog's weight, not just predict a puppy's?
Yes — select "Check my adult dog's healthy weight range" above, enter your dog's current weight and size category, and this calculator checks it against the typical healthy weight range for their size, not just a puppy growth projection.
How do I estimate my puppy's adult weight?
Divide your puppy's current weight by their age in weeks, then multiply by the expected maturity age in weeks: 40 for small breeds, 52 for medium, 72 for large, 84 for giant breeds. This is most accurate during the active growth phase.
When do puppies reach their full adult weight?
Small breeds typically reach adult weight by 8–10 months. Medium breeds by around 12 months. Large breeds by 12–18 months. Giant breeds may continue growing until 18–24 months.
How accurate is the adult weight estimate?
It is most reliable during the active growth phase and for a puppy whose expected adult size is known. It is least reliable for mixed breeds of unknown parentage, where the size category itself is a guess, and for giant breeds, which keep filling out well past 12 months. Re-running it every few weeks and watching whether the projection holds steady tells you more than any single estimate.
How accurate is the healthy weight range for my dog?
The range is based on breed size category rather than exact breed, since standards vary within breeds too — two dogs of the same breed can sit at different healthy weights depending on frame. The rib and waist check above settles it: a lean, well-muscled dog can be perfectly healthy above or below the category average.
How can I tell if my dog is at a healthy weight?
You should be able to feel your dog's ribs easily without pressing hard, but they shouldn't be visibly prominent. From above, your dog should have a visible waist. From the side, the belly should tuck up slightly behind the rib cage.
How are dog sizes defined by weight?
Weight is how dog size is usually classified. The usual bands are toy under 12 lbs, small 12–25 lbs, medium 25–50 lbs, large 50–100 lbs and giant over 100 lbs. Those bands matter for more than labelling — they drive growth timelines, medication dosing, food portions and joint-care advice, which is why this calculator asks for breed size rather than treating all dogs the same.
What is the average dog size at 14 weeks?
At 14 weeks there is no single average worth quoting, because breed size dominates everything else: a toy-breed puppy is around 2–4 lbs, a small breed 6–10 lbs, a medium breed 10–20 lbs and a large breed 18–32 lbs. Fourteen weeks sits between the 12-week and 16-week rows on most growth charts, so reading between those two is the practical approach. Our Puppy Weight Chart by Breed Size has the full set of rows.