This chart answers one question: at a given age, what fraction of its adult weight has a puppy typically reached? The answer depends far more on size class than on anything else — a toy breed is essentially finished before a giant breed is two-thirds done. Read your puppy's column, divide today's weight by the percentage, and you have an adult estimate.
| Age | Toy under 4 kg (9 lb) | Small 4-10 kg (9-22 lb) | Medium 10-25 kg (22-55 lb) | Large 25-45 kg (55-100 lb) | Giant over 45 kg (100 lb) |
|---|---|---|---|---|---|
| 8 wks ≈ 2 mo | ~30% | ~25% | ~20% | ~17% | ~14% |
| 10 wks ≈ 2.5 mo | ~38% | ~33% | ~27% | ~23% | ~19% |
| 12 wks ≈ 3 mo | ~45% | ~40% | ~33% | ~28% | ~23% |
| 16 wks ≈ 3.5 mo | ~60% | ~55% | ~47% | ~38% | ~31% |
| 20 wks ≈ 4.5 mo | ~72% | ~67% | ~58% | ~47% | ~39% |
| 26 wks ≈ 6 mo | ~85% | ~80% | ~70% | ~58% | ~49% |
| 34 wks ≈ 8 mo | ~94% | ~90% | ~83% | ~70% | ~60% |
| 44 wks ≈ 10 mo | adult | ~97% | ~93% | ~82% | ~72% |
| 58 wks ≈ 13.5 mo | adult | adult | adult | ~93% | ~85% |
| 72 wks ≈ 16.5 mo | adult | adult | adult | adult | ~94% |
| 90 wks ≈ 20.5 mo | adult | adult | adult | adult | adult |
Approximate values. Compiled from commonly published veterinary and breeder growth guides, rounded to whole percentage points, and used by our calculator with a ±15% uncertainty band. This is a rule-of-thumb reference, not a measured growth study — healthy puppies routinely land outside these figures. "Adult" marks the age band where dogs of that size are typically full-grown.
Pick by the adult size you expect (parents are the best guide). Medium: e.g. Beagle, Border Collie, Cocker Spaniel.
9–16kg(20–36 lb)
Union of the two methods below. A range is the honest answer — no formula can predict one exact number for a growing puppy.
9–13kg
At 16 weeks, medium-class puppies are at roughly 47% of adult weight (approximate table, ±15%). Adult estimate = current weight ÷ fraction.
16kg
(current weight ÷ age in weeks) × 52. Simple linear rule — least accurate for large and giant breeds, and it tends to overshoot for toys. Included in the combined range above.
Estimate only — growth varies by breed, diet and genetics; two healthy littermates can end up at very different adult weights. Confirm anything that matters with your vet.
Say your medium-class puppy (expected adult weight somewhere in the 10–25 kg band — a Beagle mix, for instance) weighs 5 kg at 16 weeks. The medium column reads ~47% at 16 weeks. So: 5 ÷ 0.47 ≈ 10.6 kg. With the ±15% band the honest answer becomes 9–13 kg (20–28 lb). The calculator above does exactly this arithmetic, plus the simple linear rule for comparison, and is preset with these numbers so you can see it live.
You can also run the chart backwards. If a breeder tells you the parents weigh about 30 kg, then at 16 weeks a large-class puppy should weigh very roughly 30 × 0.38 ≈ 11 kg, give or take the same margin. A 16-week-old "30 kg parents" puppy weighing 4 kg does not match that story.
Growth duration scales with adult size. Toy breeds finish their skeletal growth in well under a year, so at any given age they have completed more of their journey. Giant breeds keep laying down bone and muscle for up to two years — at 26 weeks, when a Yorkie is ~85% done, a Great Dane is around half of its adult weight with a year of growing still ahead. This is also why large- and giant-breed puppies have their own food formulas and their own exercise cautions: their growth window is simply much longer.
The columns converge at "adult", but they get there at very different times: toy breeds at about 9-11 months, small at about 10-12 months, medium at about 12-15 months, large at about 15-18 months, and giant breeds at about 18-24 months. The full breakdown, including what "stops growing" actually means physiologically, is in when do dogs stop growing.
For breed-specific expectations built on published breed-standard adult ranges, see Labrador puppy weight and Golden Retriever puppy weight — both include a week-by-week expected-weight table derived from this chart. Or go back to the puppy weight calculator to run your own numbers.
Everything on this page is an estimate. Growth varies by breed, diet and genetics — if you have any question about whether your puppy's growth is healthy, that is a veterinarian's call, not a chart's.