Dog Food Calculator

Use our Dog Food Calculator to estimate how much food your dog may need each day based on weight, life stage, activity level, body condition and food calorie density.

Calculate Your Dog's Daily Food Amount

Enter your dog's details and the calorie information from their food.

Dog's Weight (kg) * Enter your dog's current body weight in kilograms.

Life Stage * Puppies and senior dogs can have different energy requirements.

Activity Level * Consider your dog's typical daily exercise and activity.

Neutered Status * Neutering status can affect energy requirements in some dogs.

Body Condition * Choose the option that best describes your dog's current condition.

Food Type * Calorie density is used to convert calories into grams of food.

Calories per 100g * Check your dog food packaging for its calorie information. If available, use the manufacturer's kcal per 100g value.

Meals Per Day * The daily estimate will be divided between these meals.

Estimated Daily Feeding Amount

Estimated Daily Calories 0 kcal/day

Estimated Daily Food 0 g/day

Estimated Per Meal 0 g/meal

Calculation Summary

Weight —

Life Stage —

Activity —

Neutered Status —

Body Condition —

Food Type —

Food Energy —

Meals Per Day —

How this estimate is calculated: The calculator first estimates Resting Energy Requirement (RER) using 70 × (body weight in kg^0.75). It then applies simplified starting adjustments for life stage, activity, neutering status and body condition. These adjustments are intended as a practical starting estimate rather than a universal nutritional prescription.

Important: This calculator provides an estimate for general informational purposes only. Every dog is different, and actual food requirements can vary based on age, breed, activity, metabolism, body condition, health and the calorie density of the food. Always follow the feeding guidance on your dog's food packaging and speak with a qualified veterinarian if you are unsure about your dog's nutritional needs.

How Does a Dog Food Calculator Work?

A dog food calculator estimates the amount of energy a dog may need each day and then converts that energy requirement into an approximate amount of food. The calculation starts with an estimate of Resting Energy Requirement (RER), which represents the energy needed for basic body functions at rest.

The calculator then uses factors relating to life stage, activity, neutering status and body condition to produce a practical starting estimate. Because dogs can respond differently to the same amount of food, the result should be treated as a starting point rather than an exact feeding prescription.

How Much Should I Feed My Dog?

The right amount depends on more than your dog's weight. Age, activity level, body condition, neutering status, individual metabolism and the energy density of the food can all affect how much food your dog needs.

Two foods may have very different calorie densities, so the same number of grams can provide very different amounts of energy. Use the manufacturer's feeding guide together with your dog's body condition and, where appropriate, professional veterinary guidance.

How Many Calories Does My Dog Need?

A common starting point for estimating canine energy requirements is the Resting Energy Requirement (RER) formula:

RER = 70 × (body weight in kg^0.75)

RER is not the same as the total amount of food every dog should receive. A dog's daily energy requirement can be higher or lower depending on growth, activity, reproductive status, body condition and individual circumstances.

Puppies in particular can have different energy requirements depending on their age and growth stage. Senior dogs can also have changing energy needs, which is why a calculator should not be treated as a fixed prescription.

How to Use the Calculator

Enter your dog's current weight in kilograms.
Select your dog's life stage.
Choose the activity level that best matches your dog's normal routine.
Select whether your dog is neutered or not neutered.
Select the body condition that best describes your dog.
Select the type of dog food you are feeding.
Enter the food's kcal per 100g from the packaging or manufacturer's information.
Select how many meals your dog normally receives each day.
Click Calculate Food Amount to view the estimate.

Why Dog Food Calories Matter

Food portions cannot be judged accurately by grams alone. Different dog foods contain different amounts of energy in each gram. For example, a dry food containing 400 kcal per 100g provides more calories in the same weight of food than a food containing 300 kcal per 100g.

This is why entering the calorie density from your dog's actual food is important when using a calorie-based calculator.

Is This Dog Food Calculator Accurate?

The calculator provides an estimate rather than an exact answer. Energy requirements differ between individual dogs, even when they have the same weight, breed or age.

Compare the result with the feeding instructions supplied by the food manufacturer and monitor your dog's body condition and weight over time. If your dog is underweight, overweight, growing, pregnant, nursing, elderly, unwell or has specific nutritional requirements, professional veterinary guidance is particularly important.

Dog Food Calculator FAQs

The amount depends on your dog's weight, life stage, activity, body condition and the calorie density of the food. Use the calculator as a starting estimate and compare it with the feeding guide on your dog's food packaging.

Daily calorie requirements vary between dogs. A common starting point is the RER formula, 70 × (body weight in kg^0.75), followed by adjustments for factors such as growth, activity and body condition.

Estimate the dog's daily calorie requirement and divide it by the food's calorie density. If a food contains 350 kcal per 100g, divide daily calories by 350 and multiply by 100 to estimate grams of food.

There is no single amount that applies to every dog. Dry foods differ in calorie density, so use the specific food's calorie information together with your dog's individual requirements and the manufacturer's feeding guide.

Wet food can have a different calorie density from dry food, so the required weight in grams can vary substantially. Check the food's calorie information and follow the manufacturer's feeding recommendations.

Yes, the calculator includes a puppy option, but puppy energy needs can change considerably with age, growth rate, breed and expected adult size. Use the result only as a starting estimate and follow appropriate puppy feeding guidance.

An overweight dog may have different feeding requirements, but calorie restriction should be approached carefully. Avoid rapid or extreme changes and discuss an appropriate weight-management plan with a veterinarian.

Yes. Two foods can contain very different amounts of calories in the same weight. This means grams alone do not tell you how much energy a portion provides.

Feeding frequency can vary according to the individual dog, age, routine and feeding plan. This calculator allows one to four meals per day so the estimated daily amount can be divided into portions.