Free tool
Puppy weight calculator
How big will your puppy get? Enter what it weighs now, how old it is, and the size it is expected to finish at - this estimates the adult weight, how far through growing it already is, and what to expect month by month.
Large - 25-45 kg / 55-100 lb. Typical breeds: Labrador, German Shepherd, Golden Retriever, Boxer, Doberman, Husky.
Mixed breed? Pick the size the larger parent finished at. If you have no idea, medium is the safest starting point.
Estimated adult weight
32.5 kg
Likely range 28.3 kg to 36.7 kg
Already grown
40%
Still growing for
~12 months
Large breeds finish at roughly 16 months.
What to expect from here
These figures are averages across many dogs of a similar size, not a measurement of your puppy. Healthy individuals sit above and below the curve all the time, and diet, neutering age, and genetics all move the finishing weight. If your puppy seems to be gaining or losing weight in a way that worries you, that is a conversation for your vet rather than a calculator.
Why size category changes everything
Most puppy weight rules you will read online are a single multiplier - double the weight at fourteen weeks, or multiply the eight-week weight by four. They persist because they are easy to remember, and they are wrong for most dogs, because a multiplier is only correct for one size of dog at one age.
Small dogs grow fast and finish early. Large dogs grow for far longer and spend months adding weight after they have stopped getting taller. At sixteen weeks a toy breed is already around 60% of its adult weight, a Labrador is about 40%, and a Great Dane is barely a third of the way there. Applying the same multiplier to all three guarantees two of them are badly wrong.
That is why this calculator asks for the expected adult size first and reads from a different growth curve for each. The chart below shows roughly how much of its adult weight a puppy of each size has reached at a given age.
Puppy growth chart: percentage of adult weight by age
| Size | Adult weight | 8w | 12w | 16w | 24w | 32w | 52w |
|---|---|---|---|---|---|---|---|
| Toy | under 4 kg / 9 lb | 27% | 45% | 60% | 82% | 93% | 100% |
| Small | 4-11 kg / 9-24 lb | 22% | 40% | 55% | 76% | 89% | 100% |
| Medium | 11-25 kg / 24-55 lb | 18% | 33% | 47% | 68% | 83% | 99% |
| Large | 25-45 kg / 55-100 lb | 15% | 28% | 40% | 60% | 75% | 95% |
| Giant | over 45 kg / 100 lb | 12% | 23% | 33% | 51% | 66% | 90% |
Read a row across to see how a puppy of that size fills out. Notice how the gap widens with age: at eight weeks every size sits between 12% and 27%, but by six months a toy breed is nearly done and a giant breed is only half way.
What the estimate cannot tell you
A growth curve is an average drawn across a great many dogs. Your puppy is one dog, and healthy individuals sit above and below the line all the time - littermates from the same pairing routinely finish several kilos apart.
What is worth paying attention to is the shape of the trend rather than any single reading. Steady gain along a consistent line is what you want to see. A sudden drop, a long plateau during a period when the curve says a puppy should be growing quickly, or a sharp jump are all worth mentioning to your vet - not because the calculator says so, but because the pattern is the useful signal and a single weigh-in never is.
This is a calculator, not veterinary advice. It cannot see your puppy, and nothing here should replace a conversation with someone who can.
Common questions
How big will my puppy get?
Estimate it from how far through its growth the puppy already is. A breed that is typically 40% of its adult weight at 16 weeks, weighing 13kg at that age, projects to about 32kg full grown. The size category matters enormously: a toy breed at 16 weeks is already 60% of the way there, while a giant breed is barely a third.
Is the 'double the weight at 14 weeks' rule accurate?
Only for medium breeds, and only roughly. The multiplier that rule bakes in is correct for one size of dog at one age. Doubling a toy puppy's 14-week weight overestimates it, and doubling a Great Dane's badly underestimates it - giant breeds are only about a quarter grown at that point.
At what age do puppies stop growing?
It depends almost entirely on adult size. Toy breeds are essentially finished around 10-11 months, small breeds by 12, medium breeds by 13-14, large breeds at 15-18, and giant breeds keep filling out until 18 months or later. Large and giant dogs also add muscle and chest depth well after their height stops changing.
How accurate is a puppy weight calculator?
It is an estimate, and the younger the puppy the wider the honest range. At eight weeks, litter variation dominates and a prediction can be off by a fifth in either direction. By four to six months the number tightens considerably. Treat the range as the answer rather than the single figure.
How do I estimate a mixed breed puppy's adult weight?
Use the size category the larger parent finished at, since mixes often trend toward the bigger side. If you do not know the parents, medium is the safest starting point, and re-run the estimate every few weeks - as the puppy grows, the calculation corrects itself.
Should I worry if my puppy is above or below the estimate?
Usually not. These curves are averages across many dogs, and healthy puppies sit either side of them routinely. What matters more than the number is the shape of the trend: steady gain along a consistent line is normal, while sudden loss, a long plateau, or rapid gain is worth raising with your vet.
Does neutering affect adult weight?
It affects growth more than final weight. Neutering before the growth plates close tends to delay their closure slightly, which can make a dog marginally taller and leggier. The bigger effect is on metabolism afterwards, which is a feeding question rather than a growth one.
Running a clinic rather than raising a puppy?
Weight trends are far more useful to a vet than single readings, which is the whole argument for keeping them in one place per patient rather than scattered across paper cards. Smapey's vet clinic manager keeps patient records, visit history, and vaccination schedules together, and you are welcome to embed this calculator on your own clinic site.
Use this on your own site
Free to embed on breeder pages, rescue sites, training blogs, or a clinic's own website. No attribution required, though a link back is always welcome.
<iframe src="https://smapey.com/vet-clinic/puppy-weight-calculator/embed" width="100%" height="900" style="border:2px solid #161616;border-radius:22px" title="Puppy Weight Calculator" loading="lazy"></iframe>Keep Exploring
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