# Dog and Cat Food Portion Calculator (Calories per Day)

Estimate how many calories your dog or cat needs a day and how many grams of their food that is, using the standard veterinary formulas.

- URL: https://toolstackhub.co.uk/tools/pet-food-portion-calculator/
- Category: Calculators
- Price: free, no sign-up
- Privacy: runs in the browser; input is not uploaded
- Last updated: 2026-10-08

## About
The Pet Food Portion Calculator estimates a dog’s or cat’s daily energy need from weight and life stage. It uses the resting energy requirement, 70 × body weight in kilograms to the power of 0.75, multiplied by a factor for age, neutering and activity, then turns the calories into grams using your food’s energy content. The result is a starting point to adjust by watching body condition, and a vet is the best guide for puppies, kittens, ill or overweight pets.

## How to use
1. Enter your pet’s weight and choose kilograms or pounds.
2. Choose the life stage that fits, for example neutered adult dog or weight-loss cat.
3. Enter the calories per 100 g from the food label, and the number of meals.
4. Read the daily calories and the grams of food, then adjust to your pet’s body condition.

## FAQ
**How many calories does my dog need?** A 20 kg neutered adult dog needs about 1,060 kcal a day by the standard formula. It depends on the dog.

**How do I work out how much to feed in grams?** Divide the daily calories by the food’s kcal per 100 g and multiply by 100.

**Do treats count?** Yes. Take them off the daily total, ideally keeping treats under about 10% of calories.

**Is the Dog and Cat Food Portion Calculator (Calories per Day) free?** Yes, with no sign-up or limits.