Puppy Growth Chart by Size
Roughly what percent of adult weight a puppy has reached at a given age, broken out by adult size tier.
Enter your puppy's breed, current weight, and age for a precise adult weight estimate.
Calculate My Puppy's Adult Weight →Percent of adult weight reached, by week
These figures reflect typical growth curves used by vets and breeders as general guidance. Individual puppies vary — use this as a reference point, not an exact prediction.
| Age (weeks) | Toy (<10 lbs adult) | Small (10–30 lbs) | Medium (30–50 lbs) | Large (50–100 lbs) | Giant (>100 lbs) |
|---|---|---|---|---|---|
| 8 | 30% | 25% | 20% | 15% | 10% |
| 12 | 45% | 38% | 30% | 22% | 16% |
| 16 | 58% | 50% | 40% | 30% | 22% |
| 20 | 70% | 62% | 52% | 40% | 30% |
| 24 | 80% | 72% | 62% | 48% | 36% |
| 30 | 90% | 85% | 75% | 60% | 46% |
| 40 | 99% | 95% | 88% | 75% | 58% |
| 52 (1 yr) | 100% | 100% | 97% | 88% | 72% |
| 65 | 100% | 100% | 100% | 97% | 85% |
| 78 (18 mo) | 100% | 100% | 100% | 100% | 93% |
| 90 | 100% | 100% | 100% | 100% | 97% |
| 104 (2 yrs) | 100% | 100% | 100% | 100% | 100% |
How to read this
Find your puppy's size tier and current age in weeks, then read the percent reached. Divide your puppy's current weight by that percentage to get a rough adult-weight estimate — for example, a medium-tier puppy at 16 weeks has typically reached about 40% of adult weight, so a 12 lb puppy at that age would suggest roughly 30 lbs full grown.
Get a specific number
For an exact estimate using your puppy's actual breed (not just a size tier), use the Puppy Weight Calculator — it runs this same growth-curve data automatically. For the reasoning behind why growth speed varies by size, see How Big Will My Puppy Get?, or for when growth actually stops, see When Do Puppies Stop Growing?
How to use these percentages
The arithmetic is simple. Divide your puppy's current weight by the percentage for their age and size tier.
A 20-pound puppy in a large-breed tier at roughly 50 percent of adult weight projects to about 40 pounds adult. The Puppy Weight Calculator does this with breed-specific curves, but the underlying method is that division.
Two cautions. Use a healthy current weight — an overweight puppy produces an inflated projection. And treat the output as a range rather than a single number; plus or minus 10 to 15 percent is a realistic expectation.
Growth is not steady, and plateaus are normal
Puppies do not gain weight on a smooth line. Growth comes in bursts with flat stretches in between, and owners frequently worry about a plateau that turns out to be entirely normal.
Height and weight also finish at different times. Most dogs reach close to full height before they reach full weight, which is why adolescent dogs often look lanky and unfinished. The filling-out phase, where the chest deepens and muscle develops, continues for months after height stops changing — well over a year in large and giant breeds.
Weighing your puppy accurately at home
Small puppies can go on a kitchen scale. For anything larger, weigh yourself, then weigh yourself holding the puppy, and subtract. Weigh at the same time of day relative to meals for consistency, and weigh weekly rather than daily — daily fluctuation is noise, not trend.
Recording the numbers matters more than any single reading. A growth curve tells you and your vet far more than a snapshot.
When growth is worth a vet conversation
Contact your vet if your puppy:
- Loses weight, or fails to gain over a two-week period
- Is growing very rapidly and is a large or giant breed, given the joint disease risk
- Has a pot-bellied appearance with poor coat condition, which can indicate parasites or malnutrition
- Is markedly smaller than littermates and not catching up
- Shows lameness, a reluctance to exercise, or an abnormal gait during a growth phase
That last one matters. Several developmental orthopedic conditions present during rapid growth, and they are considerably more manageable when caught early.
Common questions
How do I calculate adult weight from a growth chart?
Divide current weight by the percentage of adult weight for that age and size tier. A 20-pound puppy at 50 percent projects to about 40 pounds. Use a healthy current weight, and treat the result as a range of plus or minus 10 to 15 percent.
Why has my puppy stopped gaining weight?
Puppies grow in bursts with flat stretches between, so short plateaus are normal. A plateau lasting more than about two weeks, or any weight loss, is worth a vet call, especially alongside poor coat condition or a pot-bellied appearance.
Do puppies reach full height or full weight first?
Height, usually. Most dogs reach close to adult height before adult weight, which is why adolescent dogs look lanky. Filling out through the chest and muscle continues for months afterward, well past a year in large and giant breeds.