How Many Calories Should My Dog Eat

Why a range is the right answer

Most calorie calculators give you one number. The problem is that the published reference factors are not single values — they are bands. A typical neutered adult dog does not have one fixed multiplier; the veterinary literature lists it as 1.4–1.6 × RER. Picking the midpoint and calling it "the answer" looks precise, but it is not.

Individual dogs can sit well outside the midpoint. Two dogs of the same breed, weight and age can differ by 20% or more in actual energy needs. Day-to-day activity varies. Season and climate matter. The only honest way to present this is as a calculated band, with the formula visible so you can check it.

The formula

RER = 70 × (body weight in kg)0.75

RER is the resting energy requirement — the calories a dog uses at rest for breathing, circulation, digestion and organ function. A 10 kg dog has an RER of 70 × 10^0.75 ≈ 394 kcal/day.

How the range is built

The calculator multiplies the RER by the low end and the high end of the published factor band for your dog's lifestyle. The result is a hard range you can recalculate by hand:

Low  = RER × (low factor)
High = RER × (high factor)

For a 10 kg neutered adult with typical activity, the factor band is 1.4–1.6 × RER. The range is 394 × 1.4 = 552 to 394 × 1.6 = 630 kcal/day. The midpoint is 591 kcal/day — a sensible starting point, not a guaranteed target.

Worked example: 25 kg neutered adult, typical activity

Source: the RER equation and reference factor bands are the ones published in AAHA 2021, Box 1 — Energy Requirement Calculations. The 10 kg worked example was checked against a university veterinary teaching hospital's published example (70 × 10^0.75 ≈ 394 kcal/day).

Reference factor bands

These are the published bands this calculator uses. Every number in the table below is printed in the page source so you can audit it.

The four adult bands come from AAHA 2021. The senior band is a commonly applied reduction (approximately 10–15% below the typical adult band) used in clinical practice; it is not a separate published standard.

What this calculator covers, and what it does not

This is not veterinary advice. It is a starting estimate for feeding a healthy adult dog. It does not diagnose anything and it does not replace your veterinary team.

Covers

• Apparently healthy adult dogs at a healthy body condition — a body condition score of 4 or 5 out of 9.
• Daily maintenance calories, presented as a published factor band rather than a single point.
• Dogs only. It is not built for cats.

Does not cover

• Puppies and growing dogs. Set the life stage to puppy and the calculator will warn you instead of producing a number.
• Pregnancy and nursing. These stages need veterinary supervision and a different calculation.
• Illness, recovery, poor appetite, or any prescribed or therapeutic diet.
• Unplanned weight change, or a dog whose body condition has not been checked by a vet.
• Food portion conversion (cups, cans, grams). Use the main calculator for that.

Things this range cannot know

• Individual dogs can sit well outside the calculated band. Treat the range as a starting point, not a prescription.
• The estimate checks energy only — it does not judge whether a diet is complete or balanced.
• It does not include extra energy from long walks, work, cold weather, or competition training.
• A 1 kg weighing error changes the RER by roughly 3–4%. Weigh your dog on a scale, do not guess.

Questions

Why does this calculator give a range when others give one number?

Because the published reference factors are bands, not single values. When a source gives you one number, it has silently chosen a point inside the band — usually the midpoint — and thrown away the width. That width contains useful information: it tells you how much natural variation to expect.

Should I feed the low end or the high end?

Start near the midpoint and watch your dog's body condition score and weight trend for 2–4 weeks. If the dog is gaining weight, move toward the low end. If losing or very active, move toward the high end. Small adjustments (5–10%) are enough.

How many calories should my dog eat per meal?

Divide the daily range by the number of meals. For a dog on 2 meals a day with a range of 600–720 kcal/day, each meal is roughly 300–360 kcal. For cup or gram amounts, use the main dog calorie calculator which includes food-label conversion.

My dog is overweight. Should I use the sedentary band?

Yes — the "sedentary, or tends to gain weight" band (1.0–1.2 × RER) is the lowest published band and is often used as a starting reference for weight management. Do not reduce food sharply on your own; work with your veterinary team and recheck body condition every 2–4 weeks.

Is the formula the same one vets use?

The RER = 70 × kg^0.75 equation is the one published in AAHA 2021 and is widely used in practice. The factor bands are also from that source. What varies between clinics is which point inside the band they pick, and whether they add further adjustments. This page deliberately keeps the band wide so you can see the full published span.

Do I need an account?

No. There is no sign-up, no login and no pop-up. The calculation runs in your browser and nothing you type is stored or sent.