How this calculator works
The tool rearranges a fraction, not a biological growth law. A suitable growth chart uses age, sex and likely adult-size category, and repeated measurements show the trajectory. Puppies do not gain weight at a constant weekly rate. Use this page to see what an explicit growth assumption implies, then review the result alongside parents, breed and veterinary measurements.
Formula
Adult-weight scenario = current weight / fraction grown. Current-weight scenario = adult weight × fraction grown. Fraction grown = current weight / assumed adult weight.
Worked example
A 6 kg puppy assumed to be 40% of adult weight gives 6 / 0.40 = 15 kg. If the assumption is 50%, the same puppy gives 12 kg. The assumption is a major source of uncertainty.
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Frequently asked questions
Why does entering age not generate the estimate?
One age-to-size equation cannot describe different breed growth patterns. Enter a growth fraction assessed for your puppy.
Can I use this as a feeding target?
No. Feed an appropriate growth diet and monitor body condition and growth with your veterinarian.
What if the puppy changes growth channels?
Review the measurements and growth chart with your veterinary team, especially with rapid change or poor growth.