Dogs
Puppy weight calculator: how big will my puppy get?
Divide your puppy’s weight by the share of adult weight puppies its size have reached at that age: a medium puppy of 20 lb at 16 weeks is typically about 43% grown, so expect about 46 lb.
Puppy growth chart: share of adult weight by age
How much of its adult weight a puppy has typically reached at each age, by adult size. Divide your puppy’s weight by the percentage to estimate its adult weight.
| Age | Small | Medium | Large | Giant* |
|---|---|---|---|---|
| 8 weeks | 28% | 23% | 16% | 14% |
| 12 weeks | 40% | 33% | 23% | 20% |
| 16 weeks | 53% | 43% | 32% | 27% |
| 20 weeks | 65% | 55% | 42% | 35% |
| 24 weeks | 76% | 66% | 53% | 45% |
| 28 weeks | 84% | 75% | 64% | 55% |
| 36 weeks | 94% | 88% | 81% | 73% |
| 44 weeks | 98% | 95% | 91% | 86% |
| 52 weeks | 99% | 98% | 96% | 93% |
| 66 weeks | 100% | 100% | 99% | 98% |
| 78 weeks | 100% | 100% | 100% | 99% |
*Giant breeds weren’t in the study our curves come from; we shift the large-breed curve later, which is our assumption.
Citing this? Link to https://tools.thesturdypaw.com/puppy-weight/. Computed from logistic growth curves fitted to 10 breeds. Free to reuse with a link (CC BY 4.0).
When do dogs stop growing?
Small breeds usually reach adult weight at about 9 to 11 months, medium breeds around 12 to 14 months, and large breeds at 12 to 18 months; giant breeds can keep filling out until about 2 years. In the growth study behind this tool, a toy poodle hit 99% of adult weight at 36 weeks and a German shepherd at 70 weeks.
Questions
How big will my puppy get?
Divide its current weight by the share of adult weight a puppy of its size has reached at that age: a medium puppy weighing 20 lb at 16 weeks has typically reached about 43% of its adult weight, so it should end up around 46 lb.
How accurate is a puppy weight calculator?
Expect it to be within about 10 to 25%: closest after 20 weeks, least reliable under 12 weeks. The parents’ weight and the breed standard are better guides, and your vet tracks growth against growth charts.
Is it true a puppy doubles its 6-month weight?
Not for most dogs: at 26 weeks our curves put small puppies at about 80%, medium at 71% and large at 58% of adult weight. Doubling only fits giant breeds that grow for longer.
Do big paws mean a big dog?
Not reliably. Paw size is a popular hint, but growth charts and models use weight and age, which is what this tool does.
What if my puppy is growing faster than the chart?
Ask your vet. Growth that is too fast can be a problem in large breeds, and the fix is usually the right food and amount, not a guess.
How much should a 12-week-old puppy weigh?
It depends on adult size: at 12 weeks puppies have typically reached about 40% of adult weight in small breeds, 33% in medium and 23% in large breeds.
How much will my puppy grow after 6 months?
Small breeds are nearly done by 6 months, at about 80% of adult weight on our curves; large breeds are at about 58% and still have a third or more to go.
Can I use this for a mixed-breed puppy?
Yes, pick the size class you expect as an adult; if you don’t know, run it for two classes and treat the result as a range.
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