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Free Calculator • Updated 2026

Puppy Weight Calculator

Predict how big your puppy will get. Enter their breed, age, and current weight to see their estimated adult size and growth milestones.

Select Your Breed

Search from 400+ dog breeds

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Puppy Details

Enter your puppy's current age and weight

8 weeks (~2 months)
1 weeks26 weeks52 weeks
kg

Tip: Weigh your puppy on a scale for best accuracy

400+ Breeds

Comprehensive breed database with size-specific growth curves

Growth Charts

See your puppy's projected growth curve and milestones

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Frequently Asked Questions

How can I predict my puppy's adult weight?

You can predict your puppy's adult weight using their current weight, age, and breed size category. The most accurate predictions come when puppies are 12-16 weeks or older. Our calculator uses scientifically-based growth multipliers that vary by size category.

When do puppies stop growing?

Growth timing varies significantly by breed size. Extra small and small breeds (under 10 kg) typically reach adult weight around 10-12 months. Medium breeds finish growing at 12-15 months. Large breeds take 15-18 months, while giant breeds may continue growing until 18-24 months of age.

How accurate are puppy weight calculators?

Puppy weight calculators provide estimates based on typical growth patterns. Accuracy improves when the puppy is at least 12-16 weeks old. Individual factors like genetics, nutrition, spay/neuter timing, and overall health can affect final adult weight by 10-20%.

Do male and female puppies grow differently?

Yes, male dogs are typically 10-20% larger than females of the same breed. Males also tend to take slightly longer to reach their full adult size. For the most accurate prediction, consider your puppy's gender when interpreting results.

What if I don't know my puppy's breed?

If you have a mixed breed or don't know the exact breed, use the "Select by Size" option. Estimate your puppy's expected adult size based on their paw size, parent size (if known), or vet's assessment. Most mixed breeds fit into one of five size categories.

Understanding Puppy Growth Rates by Size

XSExtra Small

Under 4 kg

Adult by ~10 months

SSmall

4-10 kg

Adult by ~12 months

MMedium

10-25 kg

Adult by ~14 months

LLarge

25-45 kg

Adult by ~18 months

XLGiant

Over 45 kg

Adult by ~24 months