The short answer
Take your dog's weight in kilograms, raise it to the power 0.75, multiply by 70 — that is the resting energy requirement — then multiply again by a factor for who the dog is. daily kcal = 70 × (kg)0.75 × factor. The factor is 1.6 for a neutered adult at normal activity, 1.8 for an intact or very active adult, 1.3 for a couch dog, 1.0 for a deliberate weight-loss plan, and 2.0 to 3.0 for puppies. That number is what you feed in total for the day, treats included.
Daily calories by weight
These are the resting energy values multiplied by the three most common adult factors, rounded to the nearest 5 kcal. If your dog is between two rows, take the lower row rather than splitting the difference — rounding down is the safe direction.
| Weight | Resting (RER) | Inactive ×1.3 | Neutered adult ×1.6 | Active / intact ×1.8 |
|---|---|---|---|---|
| 5 lb / 2.3 kg | 130 | 170 | 205 | 235 |
| 10 lb / 4.5 kg | 220 | 285 | 350 | 390 |
| 15 lb / 6.8 kg | 295 | 385 | 470 | 530 |
| 20 lb / 9.1 kg | 365 | 475 | 585 | 660 |
| 25 lb / 11.3 kg | 435 | 565 | 690 | 780 |
| 30 lb / 13.6 kg | 495 | 645 | 795 | 895 |
| 35 lb / 15.9 kg | 555 | 725 | 890 | 1000 |
| 40 lb / 18.1 kg | 615 | 800 | 985 | 1105 |
| 45 lb / 20.4 kg | 670 | 875 | 1075 | 1210 |
| 50 lb / 22.7 kg | 725 | 945 | 1165 | 1310 |
| 60 lb / 27.2 kg | 835 | 1085 | 1335 | 1500 |
| 70 lb / 31.8 kg | 935 | 1215 | 1495 | 1685 |
| 80 lb / 36.3 kg | 1035 | 1345 | 1655 | 1865 |
| 90 lb / 40.8 kg | 1130 | 1470 | 1810 | 2035 |
| 100 lb / 45.4 kg | 1225 | 1590 | 1960 | 2200 |
Why the feeding guide on the bag is usually too much
Feeding guides printed on packaging are a starting point, not a target. They are typically written to cover the widest plausible range of dogs — the entire weight band, and the active end of the activity range — so the printed amount tends to sit above what an ordinary indoor neutered dog actually burns. They are also expressed in cups, and a cup is a volume: two people filling the same cup with the same kibble can differ by 20% or more in mass.
The size of the gap matters. In the annual survey run by the Association for Pet Obesity Prevention, a majority of dogs in the United States are classified as overweight or obese, and overfeeding relative to actual energy needs is the largest single driver. If you follow the bag and your dog's waistline expands, the bag is not the authority — the dog is.
The practical fix is not to distrust the bag but to weigh what you pour. Get a cheap kitchen scale, weigh one level cup of your kibble once, and write the gram figure on the bag. From then on you are feeding a mass, not a scoop, and the numbers on this page mean something.
Treats: the 10% rule, and what it really costs
Treats are food. The usual ceiling is 10% of the day's calories, and for a dog on a weight-loss plan it is more like 5%. On a 30 lb neutered adult at 795 kcal a day, 10% is about 80 kcal — which is roughly two medium biscuits, or one filled chew, or a third of a cup of kibble handed out piece by piece during training. It is far less than most owners guess.
The tool above subtracts the treat allowance from the meals rather than adding it on top. That is the whole point: a fixed meal plus "just a few treats" is a daily surplus, and a daily surplus is how a dog gains a kilogram over a season.
How many meals, and when
Adults do fine on two meals roughly twelve hours apart, and many dogs settle better on that schedule than on one large meal. Puppies under four months have small stomachs and unreliable blood-sugar control and should be fed three to four times a day; by six months most move to two. Giant and deep-chested breeds are commonly fed two or three smaller meals to lower the risk of gastric dilatation-volvulus, though meal frequency is only one of several factors there.
Free feeding — leaving food down all day — works for a small minority of dogs that self-regulate. For the majority it removes the one signal you need: how much went in. If you cannot say how much your dog ate yesterday, you cannot adjust it.
Which weight to use if your dog is overweight
This is the decision most owners get wrong. Calculate on current weight to find out what the dog is eating today, then switch to target weight to set the weight-loss ration. Feeding an overweight 80 lb dog at the 80 lb maintenance figure is feeding it to stay 80 lb. A dog whose healthy weight is 68 lb should be rationed at the 68 lb figure, and the tool's "needs to lose weight" factor of 1.0 applied to that target weight is the conventional starting point.
The two-week adjustment rule
Any formula-based estimate can be off by as much as 50% for an individual dog, so the first number is a hypothesis. Test it: set the ration, weigh the dog on the same scale at the same time of day, and recheck in fourteen days.
- Weight held steady, ribs easy to feel under a thin fat cover, waist visible from above: you are on target. Do nothing.
- Weight up, or ribs hard to find: cut the daily total by 10% and recheck in another two weeks. Repeat in 10% steps rather than making one large cut.
- Weight down, ribs prominent, coat dull, dog hungry all the time: raise the total by 10% and recheck.
Ten percent at a time is deliberate. Large cuts push owners to abandon the plan, and large increases overshoot in the other direction.
Mixing wet and dry food
Calories add across foods, percentages do not. If you feed half the day's energy as kibble and half as canned food, work each one out separately from its own calorie content and add the two results. Do not average the protein percentages on the two labels — a canned food at 78% moisture and a kibble at 10% moisture cannot be averaged as-fed without first converting both to a dry-matter basis.
Need to check whether the mix supplies enough protein and fat, not just enough energy? The dog nutrition calculator does that comparison against the published minimums.
Mistakes that move the number more than the formula does
- Scooping instead of weighing. The single largest source of error in home feeding, and it is always in the generous direction.
- Using the wrong weight. Weighing a dog once a year, or guessing from breed averages, means every other number is built on sand.
- Ignoring the neuter factor. Energy needs drop after neutering; a dog fed the same ration before and after will gain weight.
- Confusing kcal with Cal. On pet food labels, "Calorie" with a capital C and "kcal" mean the same thing. "cal" lowercase is a thousand times smaller and does not appear on food labels.
- Counting only meals. Training treats, dental chews, table scraps, and the food inside puzzle toys all count.
Frequently asked questions
How many calories should I feed my dog per day?
Most adult dogs land between 25 and 35 kcal per pound of body weight per day, but the figure scales with size: a 10 lb dog needs about 350 kcal a day, a 50 lb dog about 1,165, and a 100 lb dog about 1,960 — all at the neutered-adult factor of 1.6. Use the chart above for your dog's exact weight and the calculator for its exact lifestyle.
How many calories should a 50 lb dog eat?
Roughly 1,165 kcal a day if neutered at normal activity, about 945 if inactive, and about 1,310 if intact or working. Puppies of that weight need considerably more — roughly double the adult figure under four months.
How many calories should a 70 lb dog eat in a day?
About 1,495 kcal a day at the neutered-adult factor, roughly 1,215 if inactive and about 1,685 if intact or working. That is the 70 lb row of the chart above: resting energy 935 kcal, multiplied by 1.6. A 70 lb puppy under four months would be calculated at 3.0 instead, which puts it near 2,800 kcal.
How many calories are in 100 g of dog food?
Whatever the label says, divided by ten. Take the kcal per kg figure and move the decimal one place: a 3,500 kcal/kg dry food is 350 kcal per 100 g, and a 1,000 kcal/kg canned food is 100 kcal per 100 g. Typical dry food lands between 300 and 400 kcal per 100 g; typical canned food between 80 and 130, because most of its weight is water. This is exactly why two foods can look equally high in protein as-fed and deliver very different amounts per calorie.
Is 1 cup of dog food a day enough?
It depends entirely on the calorie density of the food. One cup of a typical 3,500 kcal/kg kibble weighs about 110–120 g and supplies roughly 400 kcal, which is a day's food for a 12–15 lb dog and about a third of a day's food for a 60 lb dog. There is no cup-based answer that survives a change of brand.
Should I feed less if my dog is less active in winter?
Usually yes, and the signal is body condition rather than the calendar. Dogs kept outdoors in cold weather burn more, but a dog whose walks shortened when the weather turned and is still getting the summer ration will gain. Recheck every two weeks and adjust in 10% steps.
How many treats can I give my dog?
Keep treats to 10% of daily calories, or 5% during weight loss, and subtract them from meals. For a 30 lb dog at 795 kcal that is about 80 kcal of treats a day.
Do senior dogs need fewer calories?
Often, but not automatically. Energy needs fall with reduced activity and with the loss of lean muscle mass, so many seniors do well on 10–20% less. A senior that is losing weight unintentionally, however, needs a veterinary check rather than a smaller bowl.
How long until I see a change after cutting calories?
Two weeks is the earliest meaningful weigh-in, and four to six weeks is where the trend becomes clear. Safe weight loss runs at about 1–2% of body weight per week; faster than that and you are losing muscle as well as fat.
Sources
- Energy formula RER = 70 × kg0.75 and the maintenance multipliers — MSD Veterinary Manual, caloric requirements of adult dogs.
- Overweight and obesity prevalence in dogs — Association for Pet Obesity Prevention.
- Body condition scoring and feeding assessment — WSAVA Global Nutrition Guidelines.
Want the plain calorie figure with the full coefficient table and the portion in cups? Use the dog calorie calculator on the home page.