Free tool

Pet Feeding Calculator

How much should you feed your pet? Enter their details to get a daily calorie target and estimated portion size.

Tell us about your pet

Pet type

Current body weight

Life stage

Activity level

Daily recommendation

567–693

kcal / day

1.5–1.9

cups dry kibble*

Suggested: 2 meals

*Estimated at 370 kcal/cup. Check your food's packaging for exact calorie density. RER baseline: 394 kcal/day.

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How this calculator works

How is the daily calorie need calculated?

We use the Resting Energy Requirement (RER) formula: RER = 70 × (body weight in kg)^0.75. This is the baseline metabolic rate at rest. We then multiply by an activity factor (1.2–2.0) based on life stage and activity level to get the Maintenance Energy Requirement (MER).

Why is there a range and not a single number?

Calorie needs vary based on individual metabolism, health status, and the specific food you're feeding. The range accounts for ±15% normal metabolic variation. Start at the middle of the range and adjust based on your pet's body condition.

How do I convert calories to cups?

This varies significantly by brand and formula. Average dry kibble contains about 350–400 kcal per cup. We use 370 kcal/cup as a baseline. Always check the calorie density on your specific food's packaging.

Should I feed more if my pet exercises a lot?

Yes. A working dog or an active young cat may need up to 2x the calories of an inactive senior. Use the activity level selector to adjust. If in doubt, ask your vet. They can assess your pet's body condition score directly.

My vet said a different amount. Which is right?

Always defer to your vet. This calculator provides a general estimate based on population averages. Your vet has examined your specific pet and can account for health conditions, current weight trajectory, and the exact food you're using.