How does the Puppy Weight Calculator work?

Small (< 10kg adult): adult ≈ 4× weight at 8 weeks Then: Medium (10–25kg): adult ≈ 2.5× weight at 8 weeks Then: Large (25–45kg): adult ≈ 2× weight at 16 weeks Then: Estimates vary ±20% — genetics and nutrition affect final size.

Can you give an example of how to use the Puppy Weight Calculator?

Example: Input Small breed, 1.5 kg at 8 weeks gives a result of Estimated adult weight: ~6 kg.

Is the Puppy Weight Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Puppy Weight Calculator?

Our Puppy Weight Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Is this Puppy Weight Calculator medically accurate?

This tool uses clinically recognised formulas for general information and educational purposes. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider for medical decisions.

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Puppy Weight Calculator

Puppy Adult Weight Calculator

Current Weight (kg)

Current Age (weeks)

Breed Size

Puppy adult weight prediction estimates final size from current weight and age. The formula differs by expected adult size since large breeds grow for much longer than small breeds.

Symbol	Name	Unit	Description
CurrentWeight	Puppy current weight	kg or lbs	—
AgeWeeks	Puppy age	Weeks	—
EstimatedAdultWeight	Projected adult weight	kg or lbs	—

Adult size	Fully grown by
Toy/Small	9–12 months
Medium	12–15 months
Large	15–18 months
Giant	18–24 months

References

›Puppy growth — PetMD

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Puppy Adult Weight Calculator