Dog and cat calculators that show their math
Everyday pet questions in seconds, with the vet formula and its source on every page.
Free · formulas from AAHA, WSAVA and Merck · written by Malik Khurram
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How Long Can a Cat Go Without Eating? Why 24 to 48 Hours Matters
A cat shouldn’t go over 24 hours without food, and 2 days of refusing food means a vet visit now. Learn why fasting is risky for cats and what to look for.
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How Many Cups of Dog Food Are in a Pound? How to Work It Out
Cups per pound depend on your dog food’s density. Use the kcal/kg and kcal/cup on the label to find your number, the cups in a bag and how long it lasts.
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How Much Should I Feed My Cat to Lose Weight? A Safe Plan
Feed a cat about 80% of the resting calories for its ideal weight and aim to lose 0.5% to 2% a week. See a worked 16 lb to 12 lb example in cans and cups.
How we calculate
- Every tool uses a published formula, such as the resting energy equation vets use (70 × kg0.75).
- Each page shows the formula, the step-by-step math and links to its sources.
- We give ranges, not false precision, and tell you when to check with your vet.