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Cat Food Cans per Day Calculator

Find out how many cans of wet food your cat needs each day, week and month.

✔ Reviewed by a licensed veterinarianContent updated 18 Oct 2026Reviewed 18 Oct 2026Sources: NRC · Merck Veterinary Manual
Cat Food Cans per Day CalculatorFree · instant
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Quick answer. A 4 kg neutered adult cat needs about 238 kcal a day, which is 2.8 cans of an 85 kcal can: about 20 cans a week or 85 cans a month. Enter your cat's weight and the kcal in your can to see how many cans to feed and buy.

How to use the cat food cans per day calculator

  1. Enter your cat's weight and life stage.
  2. Enter the kcal in one can (on the label).
  3. Press Calculate.

Worked example

A neutered adult cat weighing 4 kg, fed a wet food with 85 kcal per can.

Weight
4 kg
Life stage
Neutered/spayed adult
Energy per can (kcal)
85
2.8 cans a day
Energy need
238 kcal/day
Cans per week
19.6
Cans per month
85
Energy per can
85 kcal

Cans from a single food; if you feed more than one food, share the calories between them.

Example values are illustrative; this result is produced by the same calculator above.

How we calculate it

MER = 70 × BW(kg)^0.75 × life-stage factor; cans per day = MER ÷ kcal per can

Sources: NRC · Merck Veterinary Manual

Understanding your result

Wet food is often sold in cans or pouches, so it helps to know how many to feed. The calculator estimates your cat's daily energy (RER × a life-stage factor) and divides it by the kcal in one can.

A 4 kg neutered adult cat needs about 238 kcal a day. With an 85 kcal can that is about 2.8 cans a day, 20 a week and 85 a month. Enter the kcal per can from the label.

If the label only shows kcal per 100 g, multiply by the can weight in grams and divide by 100. If you feed other foods too, share the calories between them with the Cat Food Calculator.

Common mistakes

  • Using kcal per 100 g as if it were kcal per can.
  • Forgetting that other foods and treats also count.
  • Feeding by the can size on the label without checking calories.
  • Mixing different cans without working each one out.
  • Not adjusting as your cat's weight changes.

Good to know

  • Wet food adds water to the diet, but calories are what matter for portions.
  • Open cans should be stored as the maker advises.
  • Cats must not be put on crash diets; ask your vet about weight loss.

Frequently asked questions

How many cans of cat food should I feed a day?

Divide your cat's daily calories by the calories in one can. A 4 kg neutered cat needs about 238 kcal a day, which is about 2.8 cans of an 85 kcal can.

Where do I find the calories per can?

Look for kcal per can on the label, or kcal per 100 g and the can weight, then multiply: kcal per can = kcal per 100 g × grams ÷ 100.

Can I mix wet and dry food?

Yes. Use the Cat Food Calculator, which splits calories between wet and dry food.

What if my can size is different?

Use the kcal in that can. If you only know kcal per 100 g, multiply by the can's weight in grams and divide by 100.

What if I feed pouches?

Use kcal per pouch in the same way.

Do I need to adjust for dry food?

Yes. Share the calories between the foods with the Cat Food Calculator.

Reviewed by a licensed veterinarian
Last reviewed 18 Oct 2026 · How we review

Sources

  1. NRC (2006) Nutrient Requirements of Dogs and Cats, National Academies Press
  2. Merck Veterinary Manual — Nutritional Requirements of Small Animals (incl. maintenance energy table)
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Estimates only. Every pet is different — confirm with your veterinarian.