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Dog & Cat Food Portion Calculator

Estimate daily calories and food grams for healthy dogs and cats using energy factors and food kcal. A starting point, not a veterinary feeding prescription.

Free calculatorExample inputsMethod & sources

Daily food portion

The prefilled numbers are examples only. For a meaningful estimate, use your pet’s current weight and the calorie information on your own food label.

Species

This calculator is for cats and dogs only; do not use it for other species.

Weight (kg)

Enter your pet’s current measured weight in kilograms (not pounds). Example: enter 10 for a 10 kg pet.

Life stage/status

Choose the closest life stage and neuter status. This changes the multiplier used for the energy estimate.

Energy unit printed on the label

Check whether the package lists kcal / 100 g or kcal / kg, then select that unit. Changing units automatically converts the existing number.

Food energy (kcal / 100 g)

Enter the energy value printed on the food label. Example: 360 kcal / 100 g equals 3600 kcal / kg; the prefilled 360 is only an example.

Calories reserved for treats/other foods (%)

Enter 0 if your pet receives no treats or other foods. Entering 5 reserves 5% of daily calories for them (accepted range: 0–10).

Meals per day (for dividing the amount)

Choose how many meals to split the daily total into. This is a calculation split, not a recommendation for feeding frequency.

Where can I find the calorie value on my pet food label?

Look for “Metabolizable Energy (ME)”, “Energy” or “Caloric Content” on the packaging. Always check the unit: 360 kcal / 100 g = 3600 kcal / kg.

If the label only shows kcal/can, kcal/cup or kJ, do not enter that number directly. It must first be converted to the corresponding energy per mass; consult the manufacturer’s product information if needed.

Other pets: Split a known daily gram amount

For rabbits, guinea pigs, hamsters and birds, we do not apply dog/cat calorie formulas. Enter a measured daily amount in grams from a suitable product label or an exotic-animal veterinarian; this tool only splits the amount.

This tool only splits a daily amount already prescribed or measured on the label. Birds and small mammals have different feeding patterns; it does not replace unlimited hay/water or special liquid diets. Do not apply daily-gram plans to aquarium fish or intermittently fed reptiles.

Pet / feed group

Measured daily feed or pellet amount (g)If the label has no daily gram guidance, do not guess. Use a species-appropriate veterinary plan.

Number of portions per day

Use a species- and life-stage-appropriate label or veterinary plan. This amount does not replace hay, suitable forage or water that must be available continuously.

This is not a feeding recommendation; it only divides the amount you entered. The number of portions is not a veterinary feeding-frequency recommendation.

Safe feeding and health essentials

Rabbits and guinea pigs require appropriate hay; birds need a species-appropriate balanced diet; small mammals benefit from weight and selective-feeding checks. Guinea pigs require dietary vitamin C. Contact an exotic-animal veterinarian about marked changes in appetite, droppings, weight or behavior.

Sources: WSAVA nutrition guidelines · Merck — small mammals · Merck — pet birds

Nutrition and food safety for dogs and cats

Treats and extras

Keep treats within a limited energy allowance: this calculator can reserve 0–10%. Main meals should be complete and balanced for the life stage. Monitor body condition and weight over time.

Foods to avoid

Grapes/raisins and xylitol are hazardous to dogs; chocolate, onions/garlic and high-caffeine foods can be dangerous for cats and dogs. Seek veterinary guidance immediately after suspected poisoning.

Health warning signs

Unexpected weight loss, frequent vomiting, increased thirst, poor appetite or reduced activity are reasons to seek veterinary assessment—not to increase an energy multiplier without evaluation.

Measuring accurately

A cup of kibble does not weigh the same across brands or pellet sizes. Weigh food in grams and use the cup/spoon converter only with a measured sample of your actual food.

Sources: ASPCA — hazardous foods · WSAVA — nutrition assessment

Important limitations

This is an initial estimate for healthy dogs and cats only. Do not use for illness, pregnancy, lactation, prescription diets, therapeutic weight loss or severe underweight. Ensure the food is complete and appropriate for the life stage. Monitor weight and body condition with your veterinarian.

Sources and method

RER = 70 × kg^0.75; MER = RER × life-stage factor; g/day = (MER × food fraction) ÷ (kcal/100g ÷ 100).

Merck Veterinary Manual — energy requirements · Merck — maintenance factors · WSAVA nutrition assessment

Frequently asked questions

Is this an exact prescription?

No. These factors are starting estimates; animals of the same weight may need different amounts.

Do kittens and adults use the same factor?

No. Factors differ by species and growth stage.