Toy dogs
8–12 monthsFast early growth, with most adult height reached within the first year.
Free puppy growth calculator
How big will your puppy get?
Estimate adult weight, height, and growth timeline for a purebred or mixed-breed puppy—even when its ancestry is unknown.
100-breed modelPrivate by designRange, not guesswork
Estimated adult size
Your puppy’s prediction
—estimated adult weight
MMediumsize class
Estimated growth complete—
Likely mature by—
Projected Adult Height—
Planning note—
The honest version
A better puppy size estimate uses more than one shortcut.
“Double the weight at 16 weeks” is memorable, but it treats every dog as if it grows at the same speed. Toy breeds mature much sooner than giant breeds. This calculator uses a growth curve matched to the expected adult size, then blends it with a typical breed range when a breed is known.
The result is deliberately a range. Sex, parent size, nutrition, health, and mixed ancestry can all move the final number. For the best real-world estimate, compare this result with your veterinarian’s body-condition assessment and the adult weights of both parents.
For a mixed-breed puppy, choose “Mixed / unknown breed.” You can enter two likely breeds when you know them, or use an expected adult size when you do not. Known parent weights can improve the estimate; without them, the range stays wider to reflect uncertain ancestry.
Read the complete methodology →Puppy growth guide
When do dogs stop growing?
Height usually settles before a young dog finishes filling out. Larger dogs generally need more time.
Small dogs
10–12 monthsOften close to adult weight around their first birthday.
Medium dogs
12–15 monthsMay gain muscle and body condition after height growth slows.
Large dogs
15–18 monthsLonger, steadier development makes early estimates less precise.
Giant dogs
18–24 monthsCan continue maturing into their second year.
Improve your estimate
Four clues worth using together
- 01
Current age and weight
Recent, accurately measured numbers give the growth curve a stronger starting point.
- 02
Breed or likely size
Adult size changes how quickly a puppy reaches each stage of growth.
- 03
Parents’ adult weights
If known, the parents are often more informative than paw size or loose skin.
- 04
Healthy body condition
An underweight or overweight puppy can distort a weight-only projection.
Common questions
Puppy size predictor FAQ
How can I estimate how big my puppy will get?
Use current age and weight together with breed or expected adult size. The younger the puppy and the less you know about its parents, the wider the reasonable range should be.
When do puppies stop growing?
Toy and small dogs often approach adult size in their first year. Medium dogs may mature around 12–15 months, large dogs around 15–18 months, and giant breeds can keep filling out until roughly 18–24 months.
Is the puppy weight calculator exact?
No calculator can account for every genetic and health factor. This is an educational planning estimate, not veterinary advice or a guarantee.
Does paw size predict adult dog size?
It can be a clue, especially when paws look unusually large for the body, but it is unreliable by itself. Age, weight, breed, and parent size are stronger inputs.
Can I use this for a mixed-breed rescue puppy?
Yes. Choose “Mixed / unknown breed.” If you know two likely breeds, select them; otherwise choose an expected adult size based on shelter guidance, a known parent, or a DNA result. The estimate is wider when ancestry is uncertain.
Why did my puppy’s estimate change?
Growth is uneven. Rechecking every four weeks with an accurate weight can produce a more stable estimate as your puppy gets older.
If your puppy is losing weight, growing unusually quickly, limping, or has a pot-bellied appearance, ask a veterinarian rather than relying on a calculator.