Puppy Weight Calculator
Estimate your puppy's adult weight based on current age and weight, and breed size category.
Published by:
isCalculator Editorial Team
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How to use this tool?
Follow these steps to estimate your puppy’s adult weight:
- Select breed size – Choose the category that best matches your puppy’s breed (Toy, Small, Medium, Large, or Giant).
- Enter current age – Input your puppy’s age in weeks (1–52). Use decimals for partial weeks (e.g., 10.5).
- Enter current weight – Input your puppy’s weight in pounds (lbs). Use decimals for precision (e.g., 5.2).
- Click “Calculate Adult Weight” – The estimated adult weight will appear below, along with a typical weight range for the breed size.
Note: This calculator uses imperial units (pounds and weeks). The formula varies by breed size: Toy/Small use 52 weeks, Medium/Large use 40 weeks, and Giant use 30 weeks as the growth period. Results are estimates; actual adult weight may differ.
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Frequently Asked Questions
The calculator provides an estimate based on average growth rates for breed size categories. Actual adult weight can vary due to genetics, diet, and health.
We support toy (up to 12 lbs), small (12-25 lbs), medium (25-50 lbs), large (50-100 lbs), and giant (100+ lbs) categories.
The calculator is designed for puppies aged 1 to 52 weeks. For best accuracy, use it when your puppy is at least 8 weeks old.