Pet Food Calculator: Daily Portion and Calories (Dog, Cat)
Calculate estimated daily feeding portions in grams (kibbles or wet food) and veterinary caloric needs (RER × activity factor).
Daily kibble portion for a dog or cat: calculation and example
The tool works out the resting energy requirement, 70 × body weight in kg to the power 0.75, then multiplies it by a factor based on species, age, activity and neutering (1.4 for a moderately active neutered adult dog). The portion in grams is that requirement divided by the food's energy density: about 192 g a day of 370 kcal/100 g kibble for a 14 kg neutered dog. It is an estimate and does not replace a vet's advice.
Factors used
| Profile | Dog (neutered / intact) | Cat (neutered / intact) |
|---|---|---|
| Young, under 12 months | 2.5 | 2.2 |
| Adult, calm | 1.2 / 1.4 | 1.0 / 1.2 |
| Adult, moderate | 1.4 / 1.6 | 1.2 / 1.4 |
| Adult, very active | 1.8 / 2.2 | 1.4 / 1.6 |
| Senior | 1.2 / 1.4 | 1.0 / 1.2 |
The weight goal then applies −15% (loss) or +15% (gain) to the current weight's requirement. In mixed feeding, half the calories come from kibble and half from wet food.
Example: 14 kg neutered adult dog, moderate activity. Resting requirement = 70 × 140.75 = 507 kcal; × 1.4 = 709 kcal a day. With 370 kcal/100 g kibble: 709 ÷ 3.7 = 192 g a day, 96 g per meal over two meals. A 12 kg bag lasts 63 days; at €65 that is €1.03 a day and about €31.47 a month (30.5 days).
Comparison with FEDIAF
FEDIAF gives maintenance needs directly: 95 kcal × weight0.75 for a dog with low activity, 110 for moderate activity, and 52 to 75 kcal × weight0.67 for a neutered or indoor cat. For the example dog that means 688 to 796 kcal, in line with the tool's 709. For a 4.5 kg neutered cat, the tool shows 260 kcal at moderate activity against 142 to 205 kcal per FEDIAF: start at the low end and watch the weight. The single under-12-months factor does not follow growth. Weigh the animal every two to four weeks and ask a vet in case of illness, pregnancy or a diet.
Sources and dates: FEDIAF, Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs, September 2025 edition, tables VII-6, VII-7, VII-9 and VII-10 (energy values unchanged from July 2024) (checked 14/10/2026).
Frequently Asked Questions
How many grams of kibble should a 14 kg dog eat?
For a moderately active neutered adult dog, the tool estimates 709 kcal a day, about 192 g of 370 kcal/100 g kibble, in two meals of 96 g. Check the energy density on the bag: at 400 kcal/100 g, the portion falls to 177 g.
How do you calculate a cat's calorie needs?
The tool multiplies the resting requirement (70 × weight to the power 0.75) by a factor: 1.0 to 1.2 for a neutered adult cat. FEDIAF recommendations are lower for a neutered or indoor cat, 52 to 75 kcal × weight to the power 0.67, i.e. 142 to 205 kcal for a 4.5 kg cat.
Should you feed less after neutering?
Yes, energy needs fall after neutering. In the tool, the factor for a moderately active adult dog drops from 1.6 to 1.4, 12.5% fewer calories; for a cat, from 1.4 to 1.2.
How do you split a portion between kibble and wet food?
The tool splits calories 50/50: for 709 kcal, 354.5 kcal come from 370 kcal/100 g kibble (96 g) and 354.5 kcal from 90 kcal/100 g wet food (394 g). Wet food, which holds more water, therefore weighs about four times as much.
Is this tool really free?
Yes, all tools on Kristools are 100% free and accessible without registration.
Is my data protected?
Yes. All processing is performed directly and securely inside your browser. No personal data is sent to our servers.