How the estimate works
Puppies of different sizes follow different growth curves. A small-breed puppy may be close to adult weight by 10-12 months, while a giant breed keeps growing for 18-24 months. The calculator compares your puppy’s age and size to typical growth data, then divides current weight by the expected percentage of adult weight.
The result is a projection with a roughly 10% range. It is most accurate for purebred puppies in a normal body condition; mixed breeds and puppies with unusual growth histories are harder to predict.
When will my puppy stop growing?
Small breeds usually finish by 10-12 months. Medium breeds fill out by 12-15 months. Large breeds keep growing to about 18 months, and giant breeds can continue to 24 months. Height often stops before muscle and chest width finish developing.
Using the number responsibly
Weigh your puppy weekly on the same scale and plot the trend. A single weight is noisy; three or four points show whether growth is on track. If your puppy is gaining far too fast or has stopped gaining, ask your vet, especially in large breeds where rapid growth can affect joints.
- Use a kitchen scale for small puppies and a bathroom scale for larger ones.
- Weigh at the same time of day, before meals.
- Sterilisation and diet can change adult body composition, not just weight.
- Breeders’ adult weights are a useful cross-check.