🐕 Puppy Adult Weight Predictor
Wondering how big your puppy will get? Search your breed (or pick a size class) and enter the current weight and age — this tool projects the adult weight from a size-specific growth curve, cross-checked against your breed's typical adult range, and shows when your puppy is likely full-grown. It's most reliable between about 8 and 16 weeks. Free, instant, and private in your browser.
This uses the common growth-rate estimate: adult weight ≈ current weight ÷ age in weeks × 52. It's most reliable between about 8 and 16 weeks. Actual adult size varies with breed, sex and genetics — treat this as a ballpark, and ask your vet for a breed-specific projection.
Private by design. This tool runs entirely in your browser — nothing you enter is uploaded or stored, and it works offline.
About
A puppy's growth rate early in life is a decent predictor of adult size, which is the basis of the weight ÷ age × 52 estimate. Accuracy depends on breed and the age at measurement: toy and small breeds finish growing sooner, while large and giant breeds keep growing for many months, so mid-puppyhood (roughly 8–16 weeks) gives the best signal. Treat the number as a ballpark with a range, not a guarantee — genetics, sex and nutrition all matter, and your vet can give a breed-specific projection.
How to use
- Enter your puppy's current weight (kg or lb).
- Enter its current age in weeks or months.
- Read the estimated adult weight and likely range.
FAQ
- How accurate is this?
- It's a ballpark. It works best at 8–16 weeks and for small-to-medium breeds; large and giant breeds grow longer, so expect more variation.
- What formula is used?
- The growth-rate method: adult weight ≈ current weight ÷ current age in weeks × 52.
- Is my data uploaded?
- No — everything runs in your browser.