Pet Care by the Numbers: Food Portions and Aquarium Volume
Get your pet's portions and habitat right — how to work out how much to feed a dog or cat, judge body condition, and measure an aquarium's true volume for safe, healthy stocking.
Cat Food Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Daily calories needed
238
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Cat Food Calculator
The Cat Food Calculator works out your daily calories needed in an instant. Enter cat's weight and activity / life stage and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the cat's weight.
- Choose the activity / life stage.
- Read off your daily calories needed — the calculator updates automatically, with no button to press.
Formula
The Cat Food Calculator uses the formula:
Daily calories needed = 70 × (Cat's weight)^(0.75) × Activity ÷ life stage
Worked example
For example, with cat's weight of 4 kg and activity / life stage of Neutered adult (1.2), the daily calories needed is 238.
| Cat's weight | 4 kg |
|---|---|
| Activity / life stage | Neutered adult (1.2) |
| Daily calories needed | 238 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Find resting energy as 70 × weight^0.75, then multiply by an activity factor. A 4 kg neutered adult cat needs about 238 calories a day.
Indoor neutered cats are often less active, so their maintenance factor is lower. Kittens and active cats need more.
Check the calories per can or per cup on the label, then divide the daily calories to find the right amount.
Use it as a starting point and watch your cat's body condition. A vet can fine-tune amounts for health and weight goals.
The Cat Food Calculator uses the formula: Daily calories needed = 70 × (Cat's weight)^(0.75) × Activity ÷ life stage. For example, with cat's weight of 4 kg and activity / life stage of Neutered adult (1.2), the daily calories needed is 238.
Enter the cat's weight. Choose the activity / life stage. Read off your daily calories needed — the calculator updates automatically, with no button to press.
Related guides
Cat Food Table: Daily calories needed by Cat's weight
Reference table of daily calories needed for Cat Food across a range of cat's weight values — exact, engine-computed figures you can read off at a glance.
How to Calculate Cat Food: Formula, Steps & Examples
Learn how to calculate Cat Food — the formula explained step by step, with worked examples and a free calculator to check your answer.