Cat Food Calculator for Wet, Dry & Mixed Feeding

1. The calculator first estimates resting energy requirement with the formula RER = 70 x body weight in kilograms raised to the power of 0.75.
2. It then applies cat-specific multipliers for life stage, activity, and body condition to estimate a practical daily calorie range instead of a single exact number.
3. For mixed feeding, the result splits the calorie range between dry and wet food using the dry-food percentage you choose.
4. The calorie range is then converted into cups, cans, or grams per day and into an estimated portion per meal.

• Choose the unit mode that matches the numbers you actually have. In US mode, use pounds and label values like kcal per cup or kcal per can. In metric mode, use kilograms and kcal per 100 grams.
• Pick the life stage that best matches your cat today. Kittens and seniors often need different feeding logic than healthy adults.
• Use the body-condition option honestly. A cat that is overweight may need a lower estimate than a cat at ideal condition.
• In mixed feeding mode, enter the dry-food share percentage as the percent of daily calories you want to come from dry food.

The daily calorie result is shown as a range because real cats do not use the exact same amount of energy every day.

For dry-only feeding in US mode, the calculator shows cups per day and cups per meal. For wet-only feeding, it shows cans per day and cans per meal.

For mixed feeding, the result shows the dry and wet portions separately so you can divide the daily calories between both food types more realistically.

Metric mode converts the food estimate into grams per day and grams per meal based on kcal per 100 grams.

• Dry food is usually more calorie-dense, so the daily volume can look much smaller than expected.
• Wet food contains more moisture, so cans per day may look larger even when the calorie total is similar.
• Mixed feeding can make appetite management easier for some cats, but the calorie split still matters more than volume alone.

• Indoor low-activity cats often need the most conservative calorie estimate because they usually burn less energy during the day.
• Indoor normal cats often land near maintenance-level multipliers when body condition is ideal.
• Outdoor or more active cats may need a higher feeding range, especially in colder weather or multi-level environments.

• Kittens can move through feeding stages quickly, so portions may need more frequent review as growth changes.
• Senior cats may lose muscle mass or develop conditions that change appetite, body condition, or nutrient needs even if weight looks stable.

• Keep treats and toppers in mind. If they are a daily habit, they should take calories away from the main meals instead of being added on top.
• Recheck label calories every time you switch foods because calorie density varies significantly between formulas and textures.
• Watch body condition and litter box habits as you adjust feeding, especially for indoor cats or seniors.

• Mixing pounds and kilograms or changing unit mode without rechecking the values.
• Using can size or cup estimates from memory instead of the exact calorie statement on the label.
• Feeding an indoor low-activity cat as if it were an outdoor or highly active cat.
• Trying to manage weight concerns without veterinary input when the cat already has a medical issue.

• National Research Council. Nutrient Requirements of Dogs and Cats.
• AAFP Feline Life Stage and Nutrition Guidance.
• WSAVA Global Nutrition Toolkit.