A healthy, neutered adult dog needs roughly 0.9 cups a day at 10 lb, 2 cups at 30 lb, 2.9 cups at 50 lb and 4.9 cups at 100 lb, assuming a dry food with 375 kcal per cup. Cups are not a unit of nutrition though: the same cup can hold 300 or 500 calories depending on the food, so the number that matters is calories, and cups are just the scoop you measure them with.
Here is the chart, the formula it comes from, and the three things that change your dog's number.
The chart: cups per day by weight
Calculated for a neutered adult dog at maintenance, using a food with 375 kcal per cup. Find your food's kcal/cup on the bag, usually near the guaranteed analysis, then adjust with the dog food calculator.
| Dog weight | Calories per day | Cups at 375 kcal/cup | Cups at 400 kcal/cup |
|---|---|---|---|
| 10 lb | 326 kcal | 0.9 | 0.8 |
| 20 lb | 549 kcal | 1.5 | 1.4 |
| 30 lb | 744 kcal | 2.0 | 1.9 |
| 40 lb | 923 kcal | 2.5 | 2.3 |
| 50 lb | 1091 kcal | 2.9 | 2.7 |
| 60 lb | 1251 kcal | 3.3 | 3.1 |
| 70 lb | 1404 kcal | 3.7 | 3.5 |
| 80 lb | 1552 kcal | 4.1 | 3.9 |
| 100 lb | 1835 kcal | 4.9 | 4.6 |
Split the daily amount into two meals for an adult dog, three or four for a puppy.
Where these numbers come from
Two steps, both from published veterinary nutrition guidance rather than from a brand.
Step one, resting energy. The resting energy requirement is RER = 70 x (body weight in kg)0.75 kcal per day, the formula in the NRC's Nutrient Requirements of Dogs and Cats and the WSAVA Global Nutrition Guidelines. The exponent matters: energy needs do not scale in a straight line with weight, which is why a 100 lb dog eats far less than ten times what a 10 lb dog eats.
Step two, the life stage multiplier. Maintenance energy is RER multiplied by a factor for what the dog actually does all day:
- Puppy up to 4 months: 3.0
- Puppy 4 to 12 months: 2.5
- Neutered adult: 1.5
- Intact adult: 1.8
- Active or working dog: 2.0
- Senior with reduced activity: 1.3
A 30 lb neutered adult works out as 13.6 kg, RER of 496 kcal, times 1.5, which is 744 kcal a day. At 375 kcal per cup that is 2 cups. The calculator does this with your dog's real weight and your food's real calorie density; the full sourcing is on the methodology page.
Why the bag usually says more
Feeding guides on packaging are printed as a single range for every dog in a weight band, and they are typically written around an intact, moderately active adult. Most pet dogs in the US are neutered and considerably less active than that assumption, so the guide often lands 20 to 30 percent above what the dog actually burns. That gap, repeated twice a day, is how a dog gains a pound a month without anyone noticing.
The calculator result is a starting point too, not a prescription. The real feedback loop is your dog's body.
The body condition check that beats any chart
Every two weeks, run three checks:
- Ribs. You should feel them easily under a thin layer of fat, the way you feel the knuckles on the back of your hand. If you have to press, that is too much cover.
- Waist from above. Looking down, there should be a visible narrowing behind the ribs.
- Tuck from the side. The belly should rise from the chest toward the hind legs, not run parallel to the ground.
If the ribs are hard to find, cut the daily amount by about 10 percent and check again in two weeks. Weight change should be gradual: roughly 1 to 2 percent of body weight per week is the usual veterinary target for safe loss.
Three things that change the number
- Treats. They should stay under 10 percent of daily calories, and they come out of the total, not on top of it. Two medium biscuits can be 80 kcal, which is more than a tenth of a small dog's day.
- Food swaps. Moving from a 350 kcal/cup food to a 450 kcal/cup food without changing the scoop is a 28 percent increase in calories. Recheck the kcal/cup every time you switch bags.
- Season and age. Activity drops in deep winter and heat waves, and again as a dog ages. The multiplier should follow.
FAQ
How many cups should a 50 lb dog eat per day?
About 2.9 cups a day of a 375 kcal/cup food for a neutered adult, which is roughly 1091 kcal. An active 50 lb dog on the same food needs closer to 3.9 cups.
Is one meal a day enough for a dog?
Adult dogs can do well on two meals a day, and two is the common recommendation for digestion and for managing hunger. Puppies need three or four smaller meals because they cannot hold a full day's calories at once.
Does the cup size matter?
Yes. A cup means 8 fluid ounces of volume, not a random mug or the scoop that came in the bag. If the scoop is unmarked, measure it once with a proper measuring cup.
My dog is always hungry on this amount. What now?
Check the body condition first: if the ribs are easy to feel and there is a waist, the amount is likely right and the begging is behavioral. Splitting the same total into three meals, or moving to a food with more fiber, usually helps more than adding calories.
Does this work for puppies?
The same formula applies with a higher multiplier, 2.5 to 3.0 depending on age, but growing puppies need reweighing every two weeks because the target moves fast. The puppy feeding calculator handles the meal split by age.
These numbers are estimates for healthy adult dogs. Any dog with a medical condition, or on a prescription diet, should be fed to a plan from their own veterinarian.