How big will my Border Collie get?
An adult Border Collie weighs 30 to 55 pounds (13.6 to 24.9 kg), according to the American Kennel Club. Put in your puppy’s age and weight to see where they’re heading.
Border Collie puppy weight calculator
Estimated adult weightAn estimate from average growth. Breed, genetics and diet all play a part.
Border Collie adult weight
| Pounds | Kilograms | |
|---|---|---|
| Male or female | 30 to 55 pounds | 13.6 to 24.9 kg |
Adult weight from the American Kennel Club’s Border Collie breed page, checked 1 October 2026. Individual dogs vary, and a healthy weight for your dog is one for your vet to judge.
How the estimate works
The calculator takes your puppy’s weight, divides it by their age in weeks, and multiplies by 52. It’s a quick guide, not a growth chart: puppies gain fast early on and slow down as they near adult size, so the answer shifts as they grow. That’s why the result is shown next to the breed’s adult weight. If the two disagree, trust the breed’s weight and your vet.
More on the Border Collie
- Our Border Collie breed guide: temperament, care and training.
- Ask other owners on the forum how their Border Collie grew.
- Find a dog trainer near you, ranked by Bark Score with training methods labelled.
- Dog age calculator: your dog’s age in human years.