Puppy Adult Weight Estimator
Estimate what your puppy will weigh as an adult based on their current age, weight, and breed size category.
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How to use this calculator
Uses the puppy's current position on the growth curve to project adult weight. Puppies are typically at their adult weight fraction proportional to their age relative to their expected age of full growth.
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Select your puppy's breed size category (if unsure, ask your vet or check your breed's typical adult weight).
- 2
Enter your puppy's current age in weeks.
- 3
Enter your puppy's current weight in kilograms.
- 4
Read the estimated adult weight range and growth progress.
Frequently asked questions
How accurate is puppy weight prediction?
Predictions are an estimate based on typical breed growth curves. Mixed-breed dogs and unusual individuals within a breed can vary significantly. The estimate improves as the puppy gets older and their growth curve becomes clearer.
When are puppies fully grown?
Toy and small breeds: 8–12 months. Medium breeds: 12–15 months. Large breeds: 15–18 months. Giant breeds: 18–24 months. Some giant breeds continue filling out muscle and chest depth until age 3.
Why does my puppy weigh less than expected for their breed?
Puppies can vary widely within a breed. The smallest puppy in a litter (the runt) may grow to normal adult size or remain slightly smaller. A vet can assess growth on a regular weight chart to ensure healthy development.
Puppy Adult Weight Estimator — How Big Will My Dog Get?
How to Predict Puppy Adult Weight
The most reliable way to estimate adult dog weight is to track growth on a percentile chart and note what percentage of their adult size they are at various ages. Toy and small breeds reach 50% of adult weight around 8 weeks; large breeds reach 50% around 14 weeks.
Why Breed Size Matters
Breed size dramatically affects growth rate and lifespan. Giant breeds take up to 2 years to reach full size but have shorter lifespans (7–10 years). Small breeds are fully grown by 8–10 months and can live 14–16 years.
Monitoring Puppy Growth
Weigh your puppy weekly for the first 3 months, then monthly until adulthood. Record weights on a growth chart to spot any deviations from normal development. Under or overweight puppies may have nutritional issues that need vet attention.
Learn more from an authoritative source:
WikipediaDog Calorie Calculator
Calculate your dog's daily calorie needs based on weight, life stage, activity level, and whether they are neutered.
Cat Calorie Calculator
Calculate your cat's daily calorie needs based on weight, life stage, body condition, and indoor/outdoor lifestyle.
Dog Age to Human Years
Convert your dog's age to human equivalent years, accounting for breed size — small dogs age slower than large breeds.
Cat Age to Human Years
Convert your cat's age to human equivalent years using the standard feline aging conversion: year 1 = 15 human years, year 2 = 24, then +4 per year after.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →