Cat Weight Loss Calculator (Safe Plan)
Estimate a safe timeline to reach a goal weight using a conservative weekly pace (commonly ~0.5–1% of body weight/week).
Quick answer
Safe pace (simple)
Many plans aim for a slow pace like 0.5–1% of body weight per week. Faster loss can be risky for cats. Always use vet guidance for overweight cats.
This page estimates weeks + weekly target. It does not replace veterinary advice.
Inputs
Use a recent scale reading.
Tip: compute goal weight first using the “Cat Ideal Weight (BCS)” page.
Weekly pace
Common conservative range: 0.5–1.0% per week.
Used only for a gentle guidance note.
Optional: daily calories (estimate)
If you know your current daily intake (food label + treats), add it here to track changes. This calculator will show a small suggested reduction (very conservative).
Enter 0 if unknown.
Safety notes (read this)
- Rapid weight loss can be dangerous for cats. Slow, steady loss is safer.
- If your cat stops eating, seems lethargic, or is vomiting/diarrhea persists, contact a veterinarian.
- Use your vet’s guidance for cats with diabetes, kidney disease, or other medical issues.
How this calculator works (formulas)
Step 1: Total weight to lose
TotalLoss = CurrentWeight − GoalWeight
Step 2: Weekly target loss
WeeklyLoss = CurrentWeight × (Rate% ÷ 100)
Rate defaults to 1% per week (you can set 0.5% for a slower plan).
Step 3: Weeks to goal
Weeks = TotalLoss ÷ WeeklyLoss
FAQ
How fast should a cat lose weight?
Slow, steady weight loss is safer for cats. Many plans target about 0.5–1% of body weight per week, but your veterinarian may recommend a different pace depending on health conditions.
Why is rapid weight loss risky?
Cats can develop serious complications if they lose weight too quickly or stop eating. If your cat isn’t eating normally, contact a veterinarian.
Do I need to count calories exactly?
Not always. Some people succeed by using measured portions and fewer treats. If you do track calories, be conservative and follow your vet’s guidance.