Puppy Weight Calculator
Predict how big your puppy will get as an adult. Uses 4 veterinary methods based on breed size, current age, and current weight. Essential for planning food portions, crate size, and more.
🐶 Enter Your Puppy's Info
How the Puppy Weight Predictor Works
We use multiple veterinary methods and average them for the most reliable estimate:
📏 Method 1: Growth Rate
Adult weight = (Current weight ÷ Age in weeks) × 52. Simple but less accurate for large breeds that grow for 18+ months.
📐 Method 2: Breed Formula
Uses breed-specific multipliers. Small breeds reach 50% of adult weight at ~12 weeks, large breeds at ~18 weeks.
📊 Method 3: Doubling
Small breeds: double weight at 16 weeks. Medium: 2.5× at 14 weeks. Large: double at 6 months.
🎯 Method 4: Parent Average
If both parents' weights are known, the average is a strong predictor — especially for purebreds.
Frequently Asked Questions
For purebred puppies with known parents, accuracy is typically within 10-15% of adult weight. For mixed breeds, the estimate is rougher but still useful for planning. The calculator is most accurate when used between 8-16 weeks for small/medium breeds and 12-24 weeks for large/giant breeds.
Small breeds reach adult size by 9-12 months. Medium breeds: 12-15 months. Large breeds: 15-18 months. Giant breeds may continue growing until 18-24 months. Note that dogs may "fill out" (gain muscle and body mass) even after height growth stops.