Predict your puppy's adult size and weight
Estimate how big your puppy will be when fully grown based on current age and weight.
A puppy growth calculator uses your puppy's current age and weight to guess how big and heavy they will be as an adult. This helps people who own pets get ready for their dog's future needs, such as the right food, exercise, and living space.
Our Puppy Growth Calculator uses growth curve algorithms that account for the non-linear nature of puppy development:
0-16 weeks
Growth Factor: 3.5x
Rapid growth phase
17-32 weeks
Growth Factor: 2.0x
Moderate growth
33+ weeks
Growth Factor: 1.3x
Slow growth phase
Growth factor for 12 weeks: 3.5
Projected weight: 8 × 3.5 × (52/12) × 0.5 = 61 lbs
Time to adult: 52 - 12 = 40 weeks
Result: A 12-week-old, 8 lb puppy ≈ 61 lbs adult weight in 40 weeks
Predictions are estimates and can vary by ±15-20%. Factors like genetics, nutrition, health, and breed characteristics all influence final adult size.
Small breeds usually stop growing by 10 to 12 months, medium breeds by 12 to 15 months, and large and giant breeds may keep growing until 18 to 24 months.
Yes, but accuracy may vary. Try to estimate based on the larger parent breed, or consult your vet who can assess bone structure and growth plates.
Genetics, the quality of nutrition, health, exercise level, and the environment all have an effect. For healthy growth, it is important to eat well and see a vet.
Not always. Different dogs grow at very different rates. It's normal for things to not go as planned as long as your puppy is healthy, eating well, and your vet isn't worried.