Dog Food Calculator: How Much to Feed a Dog by Weight & Age

1. The calculator first estimates resting energy requirement with the formula RER = 70 x body weight in kilograms raised to the power of 0.75.
2. It then applies a practical daily energy multiplier based on life stage and activity level so puppies, active adults, seniors, and lower-activity dogs are not treated the same.
3. A body-condition adjustment is added to create a cautious result for underweight or overweight adult dogs, while puppy results avoid weight-loss advice.
4. The final calorie range is converted into cups, cans, or grams per day and then split into an estimated per-meal portion.

• Choose the unit mode that matches the numbers you actually have in front of you. In US mode, use pounds and the label values for calories per cup or per can. In metric mode, use kilograms and calories per 100 grams.
• Pick the life stage that best matches your dog today. Small differences in life stage can meaningfully change calorie needs.
• Use body condition honestly. A dog that is visibly overweight may need a lower target than a dog at ideal condition.
• Enter the number of meals you feed each day so the calculator can estimate the portion per meal.

The daily calorie result is shown as a range instead of a single number because real dogs rarely have one exact feeding target every day.

The food-per-day output follows the label format you choose. That means cups per day for dry food in US mode, cans per day for wet food in US mode, or grams per day when you use metric label data.

The portion-per-meal output is a convenience estimate only. It simply divides the daily range by the number of meals you enter.

• Look for the calorie statement near the guaranteed analysis or feeding guide. It may be shown as kcal per cup, kcal per can, or kcal per kilogram.
• If the label gives only kcal per kilogram and you need a cup-based estimate, check the brand website or manufacturer support because cup weight varies by food.
• When the label gives kcal per 100 grams, use metric mode so the output can stay in grams per day.

• Dry food usually looks smaller by volume because it is calorie-dense, so cups per day can seem lower than expected.
• Wet food often requires more cans or trays per day because the food contains more water and fewer calories per ounce.
• A dog can eat a smaller dry-food volume and still consume more calories than a larger wet-food serving.

• Recheck the label after changing food brands because calories per cup or per can can differ a lot between foods.
• Track body condition over time instead of relying on the calculator alone. If ribs disappear under a thick fat layer or weight changes quickly, reassess.
• If treats are a regular part of the routine, reduce meal calories accordingly instead of adding treats on top.

• Using pounds in metric mode or kilograms in US mode.
• Entering package serving suggestions instead of the actual calorie value from the nutrition label.
• Trying to use an adult weight-loss adjustment for a growing puppy.
• Ignoring changes in activity after surgery, illness, travel, or weather shifts.

• Ask your veterinarian before making a major feeding change if your dog is pregnant, nursing, a giant-breed puppy, very old, underweight, overweight, or dealing with a medical condition.
• Veterinary guidance is also important if your dog loses weight unexpectedly, gains weight despite portion control, or shows digestive changes after feeding adjustments.

• National Research Council. Nutrient Requirements of Dogs and Cats.
• WSAVA Global Nutrition Toolkit.
• AAHA Nutrition and Weight Management Guidance.