Dog Weight Calculator
Predict Adult Weight
Estimate your puppy's adult weight
lbs
weeks
Formula
Small breeds: adult ≈ weight(6wk) × 4 | Medium breeds: adult ≈ weight(14wk) × 2.5 | Large breeds: adult ≈ weight(20wk) × 2.2 | Giant breeds: adult ≈ weight(20wk) × 2.5
Frequently Asked Questions
How can I predict my puppy's adult weight?
The best methods depend on breed size. For small breeds, multiply the weight at 6 weeks by 4, or at 12 weeks by 2. For medium breeds, multiply weight at 14 weeks by 2.5. For large breeds, multiply weight at 20 weeks by 2.2. These are estimates with typical accuracy of plus or minus 10-20%.
When do puppies stop growing?
Small breeds typically reach adult size by 10-12 months. Medium breeds by 12-14 months. Large breeds by 14-18 months. Giant breeds may not reach full size until 18-24 months. Growth plates close at different ages depending on breed size.
Why is knowing my dog's adult weight important?
Knowing estimated adult size helps you choose the right food (puppy formulas differ by expected adult size), select appropriate crate and gear sizes, plan for exercise needs, and prepare your living space. It also helps your vet monitor healthy growth.
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