Use this free dog size calculator to estimate your puppy's adult weight and size category based on age and current weight.
Puppies grow rapidly during their first year. This calculator estimates adult weight by comparing your puppy's current age and weight to common canine growth patterns.
Knowing your dog's expected adult size can help with nutrition planning, crate selection, exercise requirements, and veterinary care.
The calculator provides an estimate based on average growth rates. Genetics and breed differences can affect actual adult size.
Small breeds typically stop growing around 12 months, while large and giant breeds may continue growing until 18–24 months.
Mixed breeds are harder to predict because growth patterns vary depending on genetic background.
Different breeds grow at different rates and reach different adult sizes.