How This Works

This calculator uses multiple methods to predict adult weight based on current age and weight. The most accurate predictions come from:

Known parent weight (most accurate)
Growth curve analysis for puppies 6-16 weeks old
Breed size growth rate factors
Standard growth completion percentages

When to Measure

For best accuracy, weigh your puppy at 12-16 weeks old. Puppies grow rapidly in the first year, with smaller breeds reaching adult size sooner than larger breeds.

Planning your puppy's future size? Explore breeding timelines with PetBreed Plan to coordinate responsible growth expectations.