Puppy Weight Calculator
without the guesswork.
Puppy Adult Weight Predictor — Project an adult-weight range from age, sex and a reviewed breed or size profile, with optional trend comparison. Uses a focused calculator with visible assumptions. Inputs stay in your browser.
Labrador Retriever uses the 66–88 lb / 30–40 kg male growth profile instead of a fixed multiply-by-two shortcut.
Context matters.
- This is a population projection from one measurement, not an ideal target weight or a diagnosis.
- The range shows sensitivity to the middle half of observed weight-to-adult-profile ratios; individual puppies can fall outside it.
- Repeated weights and body-condition scoring with a veterinarian are safer than changing food from this estimate alone.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
Why does the predictor ask for breed, sex and age?
Puppies follow different growth patterns by expected adult-size group and sex. Age determines how much of the adult profile is typically reached at the current weigh-in.
What does the adult-weight range mean?
It is a sensitivity range based on the middle half of filtered weight-to-adult-profile ratios in the open study data. It is not a target weight or a guarantee.
Why is there no generic estimate for giant breeds?
The published generic standards stop at 40 kg / 88 lb because growth above that level is more breed-dependent. CalcSpan asks users to track repeated measurements with a veterinarian instead of inventing a number.