Dog Calorie Calculator
With dog weight 15 kg, calories in the food 350 kcal/cup, dog calorie comes to 854 kcal/day — daily calories. It is reached in 4 steps, the last of which is 533.53939 * 1.6, and each one is printed on the page with its numbers filled in. The formula is the one published by National Research Council, not an approximation fitted to it.
Daily calories a dog needs, from the resting energy requirement formula vets use — 70 x weight^0.75 — multiplied by the factor for its life stage.
Formula and sources checked · How we check
Dog weight 15 kg, Life stage and activity Adult, neutered — 1.6 x RER, Calories in the food 350 kcal/cup
854 kcal/day
Daily calories for the example below. Editing a field recomputes the calculator below; this figure holds the answer the page was loaded with.
It is written into the HTML rather than drawn by a script, so a search engine reading this page without running JavaScript still finds an answer.
- Resting energy requirement
70 * pow(15, 0.75)533.539 kcal/day- Daily calories
533.53939 * 1.6853.663 kcal/day- Cups of that food a day
853.66302 / 3502.439 cups- Calories available for treats at 10%
853.66302 * 0.185.366 kcal
Ask about this in the chatDog Calorie Chart by Weight
Worked example
A 15 kg neutered adult needs about 854 kcal a day — 2.4 cups of a 350 kcal/cup food. The bag would suggest a range; the arithmetic gives a starting point, and the dog's body condition over the following month decides whether it was right.
How to work it out yourself
- 1.Weigh the dog rather than estimating. The formula uses weight to the power 0.75, so an error here carries through everything below it.
- 2.Pick the factor honestly. A neutered dog needs about 11% fewer calories than an intact one of the same weight, and a dog that needs to lose weight is fed at the resting requirement itself — 38% below the neutered-adult figure.
- 3.Read the kcal/cup off the bag, not off another brand. Dry foods range from about 300 to over 500 per cup, so the same number of cups can differ by half again in calories.
- 4.Keep treats inside 10% of the total. Above that the balance of the main food is diluted, and treats are calorie-dense enough that three biscuits can be a fifth of a small dog's day.
- 5.Use the answer as a starting point and adjust by body condition after four weeks. Individual requirements vary by up to 20% either side of the formula.
Daily calories for a neutered adult by weight
| Dog weight (kg) | Daily calories | Resting energy requirement | Cups of that food a day |
|---|---|---|---|
| 2 | 188 kcal/day | 117.73 kcal/day | 0.54 cups |
| 5 | 374 kcal/day | 234.06 kcal/day | 1.07 cups |
| 8 | 533 kcal/day | 332.98 kcal/day | 1.52 cups |
| 10 | 630 kcal/day | 393.64 kcal/day | 1.8 cups |
| 15 | 854 kcal/day | 533.54 kcal/day | 2.44 cups |
| 20 | 1,059 kcal/day | 662.02 kcal/day | 3.03 cups |
| 25 | 1,252 kcal/day | 782.62 kcal/day | 3.58 cups |
| 30 | 1,436 kcal/day | 897.3 kcal/day | 4.1 cups |
| 40 | 1,781 kcal/day | 1,113.38 kcal/day | 5.09 cups |
| 50 | 2,106 kcal/day | 1,316.21 kcal/day | 6.02 cups |
| 60 | 2,415 kcal/day | 1,509.08 kcal/day | 6.9 cups |
The requirement rises with weight to the power 0.75, not proportionally — so a 40 kg dog needs about 2.7 times what a 10 kg dog needs, not four times. That exponent is why feeding by a simple weight ratio overfeeds large dogs.
The formula
- Resting energy requirement
70 * pow(15, 0.75) - Daily calories
533.53939 * 1.6 - Cups of that food a day
853.66302 / 350 - Calories available for treats at 10%
853.66302 * 0.1
Source: National Research Council — Nutrient Requirements of Dogs and Cats (2006), energy requirement equations, WSAVA Global Nutrition Guidelines — calculating daily energy requirement and the 10% treat rule, AAFCO — pet food labelling and calorie content statements
Questions people actually ask
- How many calories does my dog need?
- Start from the resting requirement, 70 × weight in kg to the power 0.75, then multiply by the life-stage factor. A 15 kg neutered adult comes to about 854 kcal a day; a 15 kg puppy over four months needs about 1,068.
- Why the 0.75 exponent?
- Because metabolic rate scales with body surface rather than mass. It is the same allometric relationship that appears across mammals, and it means a dog four times heavier needs less than three times the food — which is why feeding by simple proportion overfeeds big dogs and underfeeds small ones.
- How much should I feed a puppy?
- Three times the resting requirement under four months, dropping to twice from four months to adult size. Puppies are also fed across three or four meals a day rather than two, because their stomachs cannot hold a day's energy in two sittings.
- How do I help my dog lose weight?
- Feed the resting requirement for its target weight rather than its current weight, and expect 1 to 2% of body weight lost per week. Faster than that risks losing muscle. A vet should supervise anything more than a few kilograms.
- Why does the bag say something different?
- Feeding guides on bags are broad ranges built for an average dog at average activity, and they tend to sit at the top of the range. The calculation accounts for neutering, age and activity, which the bag cannot.
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