This puppy weight predictor estimates a puppy’s adult weight by dividing current weight by the percentage of adult maturity at the current age. Small breeds mature by ~52 weeks, large breeds by ~60, and giant breeds by ~80 weeks. It shows predicted adult weight with a ±15% range, percentage of adult weight currently achieved, and growth timeline by breed size category.
Puppy Weight Predictor
Estimate your puppy’s adult weight based on current weight, age, and breed size.
Getting the Most from a Puppy Weight Predictor
Growth estimates work best when the input is accurate and you treat the result as a guide to track against, not a promise of how big your dog will be.
Weigh accurately
- Use a baby or pet scale for small puppies. For bigger pups, weigh yourself holding the puppy, then subtract your own weight.
- Weigh at the same time of day, ideally before a meal, since a full stomach adds noticeably to a small dog’s weight.
- Take the age in weeks from the birth date on breeder or shelter paperwork. If the age is a guess, the estimate will be too.
- Use the same scale each time, so differences between scales do not look like growth.
Choose the right size category
Mixed breeds are the hardest to predict. If you know the parents, their adult weights are a better guide than breed labels. Otherwise, pick the category that fits the heavier likely parent and treat the upper end of the range with caution. Breeders and rescue staff who have raised similar litters can often suggest a realistic range too. Paw size is a popular hint but an unreliable one.
Track the curve, not one number
A single reading can mislead, especially in the first few months when growth is fast and uneven. Weigh every week or two and plot the results. Healthy puppies usually follow a fairly smooth curve, so a sudden plateau or drop is worth mentioning to your vet.
Body condition matters more than the scale
A growing puppy should be lean rather than chubby: you should be able to feel the ribs easily under a thin layer of fat and see a waist from above. This matters most for large and giant breeds, where rapid growth and excess weight strain developing joints. Feed a food formulated for your puppy’s expected adult size, adjust portions by body condition rather than to hit a target weight, and avoid calcium supplements unless your vet recommends them.
Talk to your vet if your puppy seems to be growing much faster or slower than expected, loses appetite, or has ongoing diarrhoea or vomiting. The puppy article on Wikipedia covers development stages in more detail, and you can rerun the puppy weight predictor after each weigh-in to watch the estimate settle.