Pet Growth Calculator
Written by FurStage Editorial Team
This calculator uses editorial growth assumptions. They have not been validated as an individual weight forecast. No prediction interval is available; do not use the result to set food portions.
Animal
Enter current age and weight to estimate adult size.
General guidance only — not veterinary advice and not for emergencies. Consult your vet for any health decision. Sources: Salt et al. (2017), WSAVA.
Call your vet now if your pet has trouble breathing, collapses, has severe pain, repeated vomiting, seizures, heavy bleeding, or suddenly cannot stand.
Frequently asked questions
- How does the pet growth calculator work?
- Scenario weight = current weight ÷ the assumed adult-weight fraction. Values between the listed ages are interpolated.
- Is this exact for every breed?
- This calculator uses editorial growth assumptions. They have not been validated as an individual weight forecast. No prediction interval is available; do not use the result to set food portions.
- Why does dog size matter?
- Salt et al. studied dog growth centiles, not this formula. Their charts do not validate our cat or giant-dog scenarios. Compare repeated weight measurements with an appropriate veterinary growth chart.