How Much Should I Feed My Dog? (Simple Guide + Calculator)

How much your dog should eat each day depends on more than their weight. Two dogs of the same size can need different amounts of food, and two dog foods can provide very different numbers of calories in the same number of grams.

The safest practical approach is to choose a sensible starting amount for your individual dog, measure it consistently, then monitor their weight and body condition and adjust when appropriate.

Quick Answer

There is no single grams-per-day amount that is right for every dog of a particular weight.

Start with your dog's individual energy needs and the calorie content of the complete dog food you are feeding. The feeding guide on the food or an evidence-informed calorie estimate can provide a starting point, but the amount may need adjusting according to your dog's body condition, activity, age, metabolism, environment, health and other individual circumstances.

Feed a measured amount consistently, monitor both weight and body condition, and make sensible adjustments if your otherwise healthy dog is gradually moving away from an appropriate condition. Unexpected weight or appetite changes, obvious underweight or overweight, or difficulty getting the feeding amount right should be discussed with your vet.

Key Points

A dog's body weight alone cannot tell you exactly how much food they need.
The number of grams depends on the calorie density of the particular food.
Manufacturer feeding guidance and calorie calculations are starting estimates, not exact prescriptions.
Monitor body condition as well as the number on the scales.
Treats, chews, table scraps and other extras count towards the dog's daily calorie intake.
The PetOwnerTools Dog Feeding Calculator is designed for healthy adult dogs at or near ideal body condition and should not be used for every dog or life stage.
Seek veterinary advice when weight, appetite or body condition changes unexpectedly or when deliberate weight loss, weight gain or medical nutrition is required.

Why There Is No Universal Grams-Per-Day Answer

It is tempting to say that a dog weighing a certain number of kilograms should eat a certain number of grams each day. The problem is that grams measure the weight of the food, not the amount of energy it provides.

Dog foods vary considerably in calorie density. This means that the same daily calorie requirement may correspond to a much smaller weight of one food and a much larger weight of another.

That is why a statement such as “a 25 kg dog needs 250–350 g per day” cannot safely be applied across different foods. The correct gram amount only makes sense when it is linked to the calorie content of the food being fed. Current nutritional guidance also treats calculated energy requirements as starting points because individual dogs can differ substantially.

What Affects How Much Your Dog Needs?

Several factors can influence an individual dog's daily energy requirement.

These include:

Current body weight
Body condition
Activity level
Age and life stage
Individual metabolism
Environment
Neuter status where relevant
Health and medical conditions
Calorie density of the food
Treats, chews and other sources of calories

This is why two dogs of similar weight may not thrive on identical portions.

No feeding table, equation or calculator can determine the exact requirement of every individual dog. The aim is to find a sensible starting point and then judge whether it is right for your dog. FEDIAF likewise describes calculated energy requirements as starting values that need individual adjustment.

A Practical Way to Work Out How Much to Feed

1. Start with a suitable complete dog food

For a healthy adult dog, the main ration should normally come from a complete dog food appropriate for the dog's life stage.

Check the manufacturer's feeding instructions for the actual product you are using. Commercial feeding guides can provide a useful starting point, but they may need adjusting for the individual dog.

2. Find the food's calorie information

Look for the food's energy content, usually expressed in kilocalories or kcal.

The PetOwnerTools Dog Feeding Calculator uses kcal per 100 g.

If the manufacturer gives the energy content as kcal per kg, divide that figure by 10 to convert it to kcal per 100 g.

For example, a food providing 3,600 kcal per kg provides 360 kcal per 100 g.

If you cannot find the calorie information on the packaging or manufacturer's website, contact the manufacturer rather than guessing.

3. Choose a starting daily amount

You can use the manufacturer's feeding guide or an appropriate calorie estimate as your starting point.

If you already know your dog's estimated daily calorie requirement, the food amount can be worked out from the calorie density of that food:

Daily food amount in grams = daily calorie estimate ÷ kcal per 100 g × 100

The important point is that this calculation uses the energy content of the specific food. It does not assume that all foods provide the same calories per gram.

4. Measure the food consistently

Once you have chosen a starting amount, measure the ration consistently rather than estimating it by eye.

Where practical, weighing food in grams with kitchen scales makes it easier to give the same amount each day and to make controlled adjustments later.

5. Monitor your dog

The starting amount is only useful if you then check how your dog responds.

Monitor:

Body weight over time
Body condition
Any unexpected change in appetite
Whether the current amount appears to be maintaining an appropriate condition

If your healthy adult dog gradually gains or loses weight and there are no other concerns, the portion may need a measured adjustment.

If the change is unexpected, substantial or accompanied by other changes, do not assume that repeatedly increasing or reducing the food is the answer. Speak to your vet.

Body Weight and Body Condition Are Not the Same Thing

The number on the scales tells you how much your dog weighs. It does not, on its own, tell you whether that weight represents an appropriate amount of body fat.

Body condition scoring is a practical way of assessing fat stores by looking at and feeling your dog's body.

On the commonly used nine-point body condition scale, a score of around 4–5 out of 9 is generally considered ideal. In a dog at an appropriate condition, the ribs should normally be easy to feel without a heavy covering of fat, there should be a visible waist when viewed from above, and an abdominal tuck should be apparent from the side.

Body shape, coat and individual differences can make this harder to judge in some dogs. If you are unsure whether your dog is underweight, ideal or overweight, ask your veterinary team to show you how to assess their body condition.

This matters because the aim of feeding is not to hit a particular number of grams. It is to provide enough appropriate nutrition to maintain a healthy individual dog in an appropriate body condition. Professional nutritional guidance therefore considers body condition alongside weight rather than relying on scale weight alone.

Using the PetOwnerTools Dog Feeding Calculator

The PetOwnerTools Dog Feeding Calculator can provide an evidence-informed starting estimate for healthy adult dogs at or near ideal body condition.

It uses:

Your dog's actual recent body weight
An appropriate activity category
The calorie density of the complete dog food you are feeding

The calculator estimates daily energy needs using metabolic body weight and activity-based starting values, then converts that estimate into grams using the kcal per 100 g value of your dog's food.

Its three adult activity starting values are based on the 2025 FEDIAF Nutritional Guidelines:

Low activity: 95 kcal/kg BW^0.75
Moderate low-impact activity: 110 kcal/kg BW^0.75
Moderate higher-impact activity: 125 kcal/kg BW^0.75

These are starting estimates, not exact prescriptions. FEDIAF itself emphasises that individual energy requirements can differ from calculated averages.

The calculator does not automatically change the result according to breed and does not substitute a breed-average weight for your dog's actual weight.

When not to use the adult calculator

The calculator is not designed for:

Puppies
Pregnant dogs
Lactating dogs
Dogs needing deliberate weight loss
Dogs needing deliberate weight gain
Dogs with medical conditions that affect nutritional requirements
Dogs receiving therapeutic or medically directed diets
High-level working, sport or endurance dogs outside the calculator's activity range

In these situations, individual veterinary or veterinary nutrition advice is more appropriate.

How Much Should You Feed a 25 kg Dog?

There is no reliable universal gram amount for a 25 kg dog.

Start with the dog's actual energy needs and the calorie density of the complete food being fed. A feeding amount expressed in grams cannot be interpreted properly without knowing how many calories that food provides.

For a healthy adult dog at or near ideal body condition, you can use the manufacturer's guidance or the PetOwnerTools Dog Feeding Calculator as a starting estimate, then monitor weight and body condition and adjust appropriately.

Remember Treats, Chews and Table Scraps

Food given outside the main meals still contributes calories.

That includes:

Training treats
Chews
Table scraps
Food used to give medication
Other calorie-containing extras

As a general guideline, treats and similar extras should normally provide no more than about 10% of the dog's daily calories, leaving the great majority of the diet to a complete and balanced food. If extras are being given, the main food allowance may need to be reduced accordingly.

For dogs with medical conditions, food sensitivities or veterinary-prescribed diets, ask your veterinary team before adding treats or other foods.

How Often Should You Feed the Daily Amount?

Work out the daily total first. How that amount is divided into meals is a separate question and can vary between dogs.

The calculator may show an approximate per-meal amount when the daily ration is divided into two equal meals, but this does not mean that every dog must be fed twice a day.

For more detailed guidance on meal frequency, see How Often Should You Feed Your Dog?

Puppies, Senior Dogs and Other Special Situations

Puppies

Puppies have different nutritional and energy requirements because they are growing. Do not use the healthy-adult calculator for a puppy.

Use an appropriate complete puppy food and follow growth-specific feeding guidance. For help with feeding frequency, see How Often Should You Feed a Puppy? in the Puppy Care Knowledge Hub.

Senior dogs

Age alone does not give one fixed feeding requirement for every senior dog. Activity, health, appetite, muscle condition and body condition may all change as dogs get older.

A healthy older dog may simply need continued monitoring and individual adjustment. Unexpected weight loss, weight gain, appetite changes or declining condition should be discussed with your vet rather than treated automatically as a portion-size problem.

Dogs with health or weight problems

Dogs requiring deliberate weight loss or weight gain, therapeutic diets or nutrition related to a medical condition need a more individual plan.

Reducing or increasing an ordinary food ration repeatedly without professional assessment may be inappropriate because the underlying reason for the weight or appetite change first needs to be understood.

When to Speak to Your Vet

Ask your vet for advice if:

Your dog is gaining or losing weight unexpectedly
Your dog is noticeably underweight or overweight
Appetite changes unexpectedly
You are unsure how to assess body condition
Your dog's body condition changes despite apparently consistent feeding
A medical condition may affect nutritional requirements
Deliberate weight loss or weight gain is needed
Your dog is receiving a therapeutic or medically directed diet
Ordinary feeding adjustments are not producing the expected result

Veterinary nutritional assessment commonly considers body weight, body condition and the individual dog's health and circumstances rather than simply changing food quantities in isolation.

A Simple Feeding Routine

For a healthy adult dog, the overall process is straightforward:

Choose a sensible starting amount → measure it consistently → monitor weight and body condition → adjust appropriately when needed → seek veterinary advice when routine adjustment is no longer appropriate.

This approach is more useful than trying to find one supposedly correct number of grams for every dog of the same weight.

Helpful Tool

Dog Feeding Calculator

Use the PetOwnerTools Dog Feeding Calculator for an evidence-informed starting estimate if your dog is a healthy adult at or near ideal body condition.

You will need:

Your dog's actual recent weight
An appropriate activity level
The calorie content of the complete dog food in kcal per 100 g

The result is a starting estimate to monitor and review, not an exact feeding prescription.

Related Guides

For more detail on specific feeding questions, see:

These guides explore feeding frequency and the signs that a dog's current intake may be too high or too low in more detail.

Conclusion

There is no single grams-per-day figure that tells every owner exactly how much to feed their dog.

Start with an appropriate complete food and a sensible feeding estimate based on your individual dog. Pay attention to the food's calorie density, measure the ration consistently and judge the result using both body weight and body condition.

For a healthy adult dog, gradual routine adjustments may be appropriate. If weight, appetite or body condition changes unexpectedly, your dog is clearly underweight or overweight, or health problems may be affecting their nutritional needs, ask your vet for an individual assessment.