The gap this page fills
Type "how much to feed a puppy" into a search engine and you get a wall of feeding charts. Every one of them answers in cups, and every one of them is keyed to a column the puppy has not reached: the weight it is expected to be as an adult. For a purebred from a breeder who can show you both parents, that column is a decent guess. For a mixed-breed puppy from a rescue, it is a guess dressed up as a number, and it drives the portion for the entire first year.
The veterinary-side tools do not cover the question at all. The calorie calculator published by the Pet Nutrition Alliance asks for weight, body condition score, neuter status and current intake, and states plainly that it is designed to be used by veterinary professionals — the word "puppy" does not appear on the page, and there is no growth stage to select. The Association for Pet Obesity Prevention publishes an owner-facing feeding tool, and it is titled the Adult Dog Daily Feeding Calculator; its life-stage menu separates "healthy, fully grown adult" from "still growing", but the page is built around adults. Between them, the two organisations behind most of the calorie advice owners receive have no puppy portion answer at all.
So the gap is not a missing coefficient. The coefficients are published and well known: resting energy requirement is 70 × kg0.75, and the puppy multipliers are 3.0 times resting energy requirement up to four months and 2.0 from four months onward. The gap is a missing unit. Everyone downstream of those coefficients converts the answer back into cups and hands it over, and in doing so they reintroduce an error the coefficient work had just removed.
How much should I feed my puppy: the two numbers already on the bag
United States pet food labels are required to carry a calorie statement under a heading titled "Calorie Content", and that statement has to be given two ways at once: as kilocalories per kilogram of food as fed, and as kilocalories per familiar unit — per cup, per can, per biscuit. Both numbers are on the same bag, a few lines apart, and almost nobody reads them together. Read together they do something useful.
Divide the calories per cup by the calories per kilogram and multiply by a thousand, and you get the weight of one cup of that specific food:
grams per cup = (kcal per cup ÷ kcal per kg) × 1000
A food printing 400 kcal per cup and 3,800 kcal per kilogram holds 105 g in a cup. A food printing 400 kcal per cup and 3,300 kcal per kilogram holds 121 g. Same number of calories, same scoop, sixteen grams of difference per cup, and across four cups a day that is a meal's worth of food. The industry's own method runs the other way — to work out calories per cup a manufacturer starts from "the weight of a single treat or a cup of product in grams" — which is an admission that the cup is only ever a stand-in for a weight.
This is why the arithmetic belongs on your side of the transaction. Weigh one level scoop of your puppy's food on a kitchen scale once. Write the number on the bag with a marker. From that moment every cups chart you ever read converts to grams in your head, including the one on that bag, and the conversions stop being the manufacturer's business.
How much should a puppy eat, in grams
The table below is the same arithmetic the calculator above runs, at one fixed energy density of 3,800 kcal per kilogram, which is typical for dry puppy kibble. Read down the left column for the weight your puppy is today, then across for the stage it is in.
| Puppy's weight today | Under 4 months (3.0 × RER) | 4 months onward (2.0 × RER) |
|---|---|---|
| 2 kg — 4.4 lb | 93 g | 62 g |
| 5 kg — 11 lb | 185 g | 123 g |
| 10 kg — 22 lb | 311 g | 207 g |
| 20 kg — 44 lb | 523 g | 348 g |
| 30 kg — 66 lb | 708 g | 472 g |
The second column is smaller than the first for every single weight, and that is not a typo. On the day a puppy turns four months the coefficient drops from 3.0 to 2.0 in one step, so a puppy that has gained weight since last week can be told to eat less than it did the week before. The full argument for why, and what to do when your puppy disagrees with it, is on the puppy calorie calculator page. Watch the waist and the ribs through that step rather than defending the old portion.
Change the food and these numbers move again. A canned puppy food might sit near 1,200 kcal per kilogram rather than 3,800, because water is heavy and carries no calories — the labelling rules call this out directly, noting that a canned food will have fewer calories per kilogram as fed than a dry one. At 1,200 kcal per kilogram the 10 kg puppy above needs 984 g a day under four months, not 311 g. Same puppy, same requirement, three times the weight in the bowl. This is the strongest argument for weighing portions: a volume that looks enormous can be correct, and a volume that looks small can be an overdose.
Reading a chart that is keyed to adult weight
You do not have to throw the chart on the bag away. You can make it tell you what it assumed, in three steps.
First, take the cups the chart gives for your puppy's age bracket and multiply by the calories per cup printed on the same bag. That product is the daily energy the manufacturer built the chart around. Second, run your puppy through the calculator above and compare. Third, read the difference: if the chart's figure is meaningfully higher than yours, the chart is assuming a puppy heading for a bigger adult frame than the one you have; if it is lower, the opposite. Neither is wrong, but only one of them is about your dog.
There is one conversion that does not work. A chart printed in cans cannot be turned into cups, and a chart printed in cups should not be applied to canned food. The calorie statement is an as-fed figure, so the water in the can is counted in the weight and not in the energy, and the same volume of the two foods is not the same meal. Mixing dry and wet is fine — weigh each part, add the calories, keep the total.
A puppy feeding calculator you can run without a chart
That is what the box at the top of this page is: three inputs from your kitchen — today's weight, age, and the kilogram figure off the bag — and one output in grams. It carries no brand, no expected adult weight and no assumption about which column of which chart your puppy belongs in. If you also type the calories per cup, it converts the grams into your scoop; if you do not, it leaves the answer in the only unit that travels between foods.
Then use it as a starting point, not a contract. Weigh the food for three days rather than scooping it. Photograph the puppy from above and from the side. Adjust by about ten percent depending on whether you can see a waist and feel the ribs under flat fingers, and repeat every fortnight while the puppy is gaining. A portion that was right at twelve weeks is wrong by sixteen.
How many meals a day
No published coefficient fixes the number of meals, so treat the following as scheduling convention rather than a recommendation from the literature: four meals a day up to roughly twelve weeks, three from twelve weeks to about six months, two after that. The reason it is a convention and not a rule is that the binding constraint at eight weeks is stomach capacity, not energy — a very small puppy physically cannot hold a day's food in one or two sittings, and a large-breed puppy at six months can. Split the daily grams by the number of meals and weigh each one; the total is what matters, and the split is there to make the total physically possible and to keep a small puppy's blood sugar steady through the night.
Large and giant breeds are the one case where the convention gives way to something else: pushing growth with extra calories is associated with developmental bone disease, so those puppies are deliberately kept on the lean side of the range. If your puppy is a Great Dane or a Mastiff and the number looks stingy to you, that is the number doing its job. If you are unsure whether your puppy is a large breed at all, the puppy weight calculator works the adult frame out from the puppy's current weight and age before any of this arithmetic applies.
Frequently asked questions
How much should I feed my puppy at eight weeks?
Work it off today's weight, not off a chart column. At 2 kg the puppy needs roughly 93 g a day of a 3,800 kcal/kg dry food; at 5 kg, roughly 185 g. Split that across four meals, because an eight-week-old stomach is the limiting factor rather than the energy. Soften the kibble if the puppy is small, and weigh the food rather than scooping it — at this size a rounded scoop is a meaningful fraction of the day.
How much should a puppy eat at four months?
Less than it did the week before, in coefficient terms: the growth multiplier steps from 3.0 down to 2.0 times resting energy requirement at four months. A 10 kg puppy moves from about 311 g a day to about 207 g on the same food. The puppy is still gaining weight throughout, so this looks wrong and feels wrong, and it is right. Judge the transition on body condition rather than on the bowl.
Why did the portion go down when my puppy got bigger?
Because the coefficient changed, not because the arithmetic broke. Up to four months a puppy is fed at three times its resting energy requirement; from four months onward, at twice. Between eight weeks and a year the daily target still rises overall — it is the step down at four months that catches people out, and it happens in a single day.
How often should I change the portion?
Every two weeks while the puppy is gaining, and immediately at four months when the coefficient steps down. Between eight weeks and twelve months a medium-breed puppy's daily target roughly triples, so a portion set in one month is badly wrong two months later. Re-weigh the puppy, re-run the number, then adjust ten percent up or down on what you see in the waist and the ribs.
Do I need a different amount if I feed wet food?
Yes, a much larger weight of it. Canned food carries a great deal of water, so it has fewer calories per kilogram as fed than dry food — often a third to a half as many. Work in grams off the kilogram figure on the can and the volume will look alarmingly large; that is correct. If you top dry food with wet, subtract the wet food's calories from the day before you add it, or the puppy will be over its target without eating a single extra gram of kibble.
Related: Dog Calorie Calculator Puppy Calorie Calculator Puppy Weight Calculator Dog Food Calculator Dog Nutrition Calculator Dog Weight Calculator Dog Weight Loss Calculator How Many Calories Should I Feed My Dog How Many Kcals Should My Dog Eat Homemade Dog Food Calculator.
Sources
- Resting energy requirement of 70 × kg0.75 and the maintenance factors used here (healthy puppies 3 × RER, puppies over four months 2 × RER) — MSD Veterinary Manual, Nutritional Requirements of Small Animals.
- The same puppy and adult factors in tabular form, with the note that any calculated intake is a starting point that may need modifying based on how the patient responds — MSD Veterinary Manual, Daily Maintenance Energy Requirements for Dogs and Cats.
- The requirement that a calorie statement be expressed as kilocalories per kilogram as fed and as kilocalories per familiar unit such as the cup, and that a canned food carries fewer calories per kilogram as fed than a dry one because of moisture — AAFCO, Calories.
- The method behind the printed figures, including that calories per cup are derived from "the weight of a single treat or a cup of product in grams", and the modified Atwater values of 3.5 for protein and carbohydrate and 8.5 for fat — AAFCO, Calorie Content.
- The absence of a puppy stage in the main veterinary calorie tool, which asks for weight, body condition, neuter status and current intake and states it is designed for use by veterinary professionals — Pet Nutrition Alliance, Calorie Calculator for Dogs.
- The owner-facing alternative being scoped to adults, with a life-stage menu that separates "healthy, fully grown adult" from "still growing" — Association for Pet Obesity Prevention, Adult Dog Daily Feeding Calculator.