🐾 Pets

Pet Food Serving Converter

Turn a feeding chart into the units on your own scoop: calories, grams, ounces, cups and cans. Add your pet's weight and life stage for a daily energy estimate. Press Convert.

Written and reviewed by SM Arijul Islam · Last reviewed · Editorial standards · Report an error

Optional — daily need

About the pet food serving converter

Feeding guides are printed in whatever unit suited the manufacturer — cups on American dry food, grams on European labels, cans on wet food — and none of them match the scoop in your cupboard. This converter moves freely between calories, grams, ounces, cups and cans once it knows two things: the food's energy density and the weight of a cup or a can of it.

The optional panel below the result estimates daily energy from body weight using the standard veterinary formulas, then converts that into grams, cups or cans of the food you are feeding.

The formulas used

  • Resting energy requirement: RER = 70 × (body weight in kg)0.75
  • Maintenance energy requirement: MER = RER × life-stage factor
  • Grams per day = MER ÷ kcal per gram of food

Life-stage factors

Maintenance energy factors for dogs and cats
PetFactor
Intact adult dog1.8 × RER
Neutered adult dog1.6 × RER
Inactive or overweight-prone dog1.2 – 1.4 × RER
Puppy under 4 months3.0 × RER
Puppy over 4 months2.0 × RER
Intact adult cat1.4 × RER
Neutered adult cat1.2 × RER
Kitten2.5 × RER

What foods contain

Typical energy densities of pet foods
Food typeEnergy density
Dry dog food330 – 400 kcal per 100 g
Dry cat food380 – 440 kcal per 100 g
Wet dog food80 – 120 kcal per 100 g
Wet cat food70 – 100 kcal per 100 g
Typical dry cupabout 100 g, so 350 – 450 kcal
Typical 400 g can320 – 480 kcal

Worked examples

  • A 20 kg neutered dog has an RER of 70 × 200.75 = 662 kcal, and a maintenance need of 662 × 1.6 = 1,059 kcal per day.
  • At 360 kcal per 100 g that is 1,059 ÷ 3.6 = 294 g of dry food, or about 2.9 cups of 100 g each.
  • The same dog fed a 400 g can at 420 kcal would need 1,059 ÷ 420 = 2.5 cans a day.
  • A 4 kg neutered cat needs 70 × 40.75 = 198 kcal, times 1.2 = 237 kcal per day — roughly 60 g of dry food.

Frequently asked questions

Individual pets can differ from the calculated figure by as much as 50%. Use it as a starting point, then adjust up or down over a few weeks based on body condition.
Roughly 100 g for most kibble, but density varies with kibble size and shape, so weigh the first few cups and use your own figure.
Yes. Treats should be subtracted from the daily total, not added on top, and are best kept under 10% of the day's calories.
The resting energy requirement is identical; only the life-stage multiplier changes, which is why the factor selector is the important part.

Common mistakes to avoid

  • Feeding the bag's suggested amount for an inactive dog. Bag guides are generous and assume an active adult.
  • Switching foods without recalculating. A 360 kcal/100 g food and a 420 kcal/100 g food need different scoop sizes.
  • Judging by volume alone. Cups of different kibble hold different weights.
  • Weighing a growing puppy once. Puppy energy needs change quickly with age.
These figures are general guidance, not veterinary advice. Ask your vet before changing a diet, especially for a pet with a health condition or on a weight-loss plan.

Sources and standards

A serving size on a pet food label is a starting point, not a prescription: it assumes a typical adult animal and a stated calorie density. AAFCO sets the labelling convention, and the page explains why body condition is a better guide than the number on the bag.

Related tools

Weight Converter Volume Converter Cooking Converter Calorie Calculator

A note on pet feeding

These figures are general guidance based on typical energy densities and body-weight ranges. Individual needs vary with age, activity, neutering status and health, so confirm any change of portion or diet with your veterinarian.