How much food does a dog eat per month?

A 20 kg dog eats about 8.7 kg (19 lb) of dry food a month on a typical adult food — roughly a 19 lb bag every month, or a 40 lb bag every two. A small 5 kg dog gets through about 3.1 kg (6.8 lb), and a large 40 kg dog about 14.7 kg (32 lb). The number you need for shopping is weight, not scoops.

This is the shopping-list version of the feeding calculation: daily calories × 30.44 days, divided by the calories in a pound of food.

Monthly consumption, by dog weight

At 3,700 kcal/kg (about 1,680 kcal/lb) and a neutered adult dog of typical activity (1.6 × resting energy):

Dog weight	Daily kcal	Monthly kcal	Monthly food	Monthly food
5 kg	374 kcal	11,400 kcal	3.1 kg	6.8 lb
10 kg	630 kcal	19,172 kcal	5.2 kg	11.4 lb
20 kg	1059 kcal	32,243 kcal	8.7 kg	19.2 lb
30 kg	1436 kcal	43,702 kcal	11.8 kg	26.0 lb
40 kg	1781 kcal	54,226 kcal	14.7 kg	32.3 lb

Calculated as 70 × kg^0.75 × 1.6 for daily energy — the same equation used in the feeding calculator — then × 30.44 days, divided by the food’s kcal/kg. A food with a different calorie density changes the weight you buy, not the calories your dog needs.

How this differs from the other two questions

Three related but different questions, three pages:

"How long does a bag last?" — bag size ÷ daily use. See how long a bag lasts. Note that page uses a slightly different food assumption (3,800 kcal/kg); the arithmetic is identical, the input differs.
"What does it cost per day?" — daily food × price per pound. See cost per day.
"How much do I buy each month?" — this page.

Turning it into a shopping list

Once you know the monthly weight, buying is easier to plan:

Small dog (5–10 kg): about 3–5 kg a month. A 15 lb bag lasts roughly six to eight weeks.
Medium dog (20–25 kg): about 8.7–12 kg a month. A 40 lb bag is close to a month and a half.
Large dog (30–40 kg): about 12–15 kg a month. Bulk bags make sense here — the arithmetic finally favours them.

Count treats and toppers inside the monthly total rather than on top of it, or the bag quietly runs out early.

Common follow-up questions

Does a puppy eat more than an adult of the same weight? Usually yes, and it changes month by month — see puppy feeding amounts. The monthly figure here is for a stable adult.

My dog is on a weight-loss plan — does this still work? Yes with a different multiplier. See weight loss; the equation is the same, run at a lower factor.

Should I buy the biggest bag to save money? Only if it stays fresh — see shelf life and storage. For a small dog, a big bag can go stale before it is finished.

Planning by the bag? Dry dog food in bulk on Amazon — check the kcal/kg against the table above first, because a denser food means fewer kilograms a month.

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Sources: resting energy follows the National Research Council’s Nutrient Requirements of Dogs and Cats (2006); the 1.6× neutered-adult factor and 3,700 kcal/kg typical dry food are the site defaults. This page is general information, not veterinary advice.

How long a bag lasts → · Cost per day → · Cups in a bag → · Feeding calculator →