Pet care tools / Daily feeding
Cat and dog daily feeding calculator
Use weight, age, neutering status and activity level to work out how many calories (kcal) and how many grams of dry food your pet needs each day, plus the amount per meal and a water intake reference. The calculation uses the standard RER (resting energy requirement) and MER factor formulas, and runs entirely on your own device — nothing is uploaded.
Daily feeding calculator
Enter weight, age, neutering status and activity level to get daily calories (kcal) and grams of dry food. Everything is calculated in your browser — nothing is uploaded.
Results
RER × MER factor → daily calories → grams of dry food
Suggested daily calories
238 kcal / day
RER 198 kcal × factor 1.2
Daily dry food
63 g / day
About 32 g per meal (2 meals a day) · wet or raw food needs a separate water and calorie calculation
Water intake reference
200 ml / day
These figures are general reference values calculated with standard veterinary nutrition formulas. They are for guidance only and cannot replace a veterinary diagnosis or prescription. If your pet is unwell, pregnant or nursing, recovering from surgery, still growing, or has breed-specific needs, follow your vet's advice and the label on the food or product, and adjust the portion to your pet's body condition score.
Find a food in the right portion size with the product matcher →|See daily water intake
How to use this result
- Feed to the result for 2 weeks, then weigh your pet: if the weight has not changed, keep it; if it has gone up or down, adjust by about 10% at a time.
- Wet or raw food needs its own water and calorie calculation — you cannot simply copy the dry food grams.
- Treats usually make up no more than a tenth of daily calories; if you count treats, take that amount off the main meal.
- For pets that are ill, pregnant or nursing, recovering from surgery, or not developing normally, ask your vet before changing the portion.
Formula (fully disclosed)
- RER (resting energy requirement) = 70 × weight (kg)0.75 (kcal / day).
- Daily calories = RER × MER factor; the factor depends on age, neutering and activity level (about 1.2 for a neutered adult cat, 1.6 for a neutered adult dog, 2.0-3.0 for young animals, 1.1-1.4 for senior cats and dogs).
- Grams of dry food per day = daily kcal ÷ (kcal per 100 g on the bag ÷ 100), rounded to the nearest gram.
Frequently Asked Questions
These figures are general reference values calculated with standard veterinary nutrition formulas. They are for reference only and cannot replace a veterinary diagnosis or prescription. Adjust the actual portion to body condition score, your vet's advice and the food label.
Looking for food as well? Filter real shop products by budget and needs with the product matcher →
Further reading: Daily water intake calculator|Pet age converter|Diet category guide