Puppy Weight Calculator
Wondering how big your puppy will get? Enter your pup's breed, current weight, and age to predict their adult size — plus get a bandana size recommendation for when they're fully grown.
Calculate Your Puppy's Adult Weight
How to Predict Your Puppy's Adult Weight
Predicting your puppy's adult weight helps with everything from choosing the right crate and collar to planning food portions and finding accessories that will fit. While no calculator is perfectly accurate, breed-specific growth curves combined with current weight and age provide reliable estimates within 10-20%.
The Doubling Rule
A quick estimate: take your puppy's weight at 14-16 weeks and double it for medium to large breeds. For small breeds, triple the weight at 8 weeks. These rules are rough but useful when you need a fast answer.
Growth Curve Method
Our calculator uses breed-specific growth curves — mathematical models based on typical development patterns for each size category. This accounts for the fact that toy breeds mature much faster than giant breeds.
When Do Dogs Stop Growing?
| Size Category | Adult Weight | Fully Grown By | Examples |
|---|---|---|---|
| Toy | 3-16 lbs | 10 months | Chihuahua, Yorkie, Pomeranian |
| Small | 10-30 lbs | 12-14 months | Beagle, French Bulldog, Corgi |
| Medium | 30-70 lbs | 16-18 months | Border Collie, Husky, Boxer |
| Large | 50-100 lbs | 18-22 months | Golden Retriever, Lab, German Shepherd |
| Giant | 85-230 lbs | 24 months | Great Dane, Mastiff, Saint Bernard |
Accessorizing Your Growing Puppy
One of the best parts of getting a new puppy is dressing them up. Thread N' Wags bandanas are hand-sewn with built-in elastic that stretches to accommodate a range of neck sizes — perfect for growing puppies. Rather than buying a new bandana every few weeks, our sewn-in elastic design grows with your pup within each size range.
Use the calculator above to estimate your puppy's adult size, then visit our sizing guide to find the perfect fit. For puppies still in their rapid growth phase (under 6 months), consider starting with a size that fits now and planning for their adult size later.