Puppy Weight Estimator. Divide their weight at 20 weeks by their current age in weeks and multiply by 52. (for instance, if your puppy weighs 25 pounds at 14 weeks, double this to 50 and then add 12.5 for an estimated adult weight of 62.5 pounds).
Puppy weight calculator interactive tool. You can use the weight chart as a puppy weight calculator by age for predicting a puppy's weight as they grow into an adult. If your puppy's adult does not fall within the range of weights provided, it would be best to contact a veterinarian.
However, it's not one size fits all, its dependent on breed size.
My puppy is a * and was born. For a medium to large breed puppy you can get an idea of their adult weight by doubling his weight at 14 weeks and then adding another half of his 14 week figure. A puppy weight table is a general guide to where your puppy's weight should be during the first few weeks and months of their life. Giant breeds will double what they weighed at 5 months.