Puppy Weight Estimator
Predict Adult Dog Weight

Puppy Weight Estimator — How Big Will My Puppy Get?

Wondering how big your puppy will get? Our puppy weight estimator uses veterinary-approved growth formulas to predict your dog’s adult weight. By selecting your puppy’s breed size category and entering their current age and weight, you’ll get an accurate estimate of their final adult size.

How to Use This Puppy Weight Calculator

1️⃣ Select your puppy’s breed size category — this is the most important factor for accurate prediction.
2️⃣ Enter your puppy’s age in weeks (from 4 weeks to 2 years).
3️⃣ Enter current weight in pounds — use your most recent vet visit weight.
4️⃣ Optional: add breed name for personalized reference.
5️⃣ Click “Estimate Adult Weight” — get instant prediction with weight range.

Real-Life Puppy Weight Examples

Puppy Growth Charts by Breed Size

Toy Breeds (under 12 lbs adult): 90% grown by 6 months. Multiply 8-week weight by 3-4. Example: 2 lb at 8 weeks → 6-8 lb adult.
Small Breeds (12-25 lbs): 80% grown by 5-6 months. Double 14-week weight. Example: 10 lb at 14 weeks → 20 lb adult.
Medium Breeds (25-50 lbs): 75% grown by 6 months. Double 16-week weight. Example: 18 lb at 16 weeks → 36 lb adult.
Large Breeds (50-100 lbs): 60% grown by 6 months. Double 18-20 week weight. Example: 35 lb at 20 weeks → 70 lb adult.
Giant Breeds (100+ lbs): 50% grown by 6 months. Use weight at 20 weeks × 1.8-2.2. Example: 55 lb at 20 weeks → 110-120 lb adult.

Factors That Affect Puppy Weight

• Genetics — parents’ size is the strongest predictor
• Gender — males typically weigh 10-20% more than females
• Nutrition — quality puppy food supports optimal growth
• Spay/Neuter timing — may slightly affect final size and growth plates
• Health — parasites or illness can temporarily impact weight gain
• Mixed breeds — may inherit traits from either parent breed

Frequently Asked Questions