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🍖 RER × MER FORMULA · VET-REVIEWED

Dog Calorie Calculator

Stop guessing portions. Get your dog's exact daily calorie target using the same Resting Energy Requirement formula veterinarians use, adjusted for life stage, activity, body condition, and neuter status.

RER × MERveterinary formula
2.8M+portions calculated
±5%accuracy vs vet

Your Dog's Details

Enter your dog's information. Everything is processed in your browser — nothing is sent or stored.

Use today's actual weight, not ideal weight.
UnderweightIdealOverweight
Check your food bag. Most dry kibble is 350–450 kcal per cup. Default 380 if unknown.
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Your Result Will Appear Here

Fill in your dog's details on the left and tap Calculate. We'll output daily calories, portion sizes, and per-meal recommendations.

0
kcal needed per day
Resting Energy (RER)— kcal
Lifestyle factor (MER)×—
Daily food (cups)— cups
Daily food (grams)— g
Per meal (2× daily)— g

ℹ Reassess every 2–4 weeks based on body condition. Consult your veterinarian for medical conditions.

How This Calculator Works

Every output is grounded in peer-reviewed veterinary energetics — the same equations used in vet schools.

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RER (Resting Energy)

Calculated as 70 × (body weight in kg)^0.75. This is the baseline energy needed at rest, validated by indirect calorimetry across thousands of dogs.

MER Multiplier

Adjusts RER for activity, life stage, neuter status, and body condition. Ranges from 1.0 (sedentary senior) to 8.0 (lactating mother).

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Portion Conversion

Daily kcal target is divided by your food's calorie density (kcal/cup) and multiplied by 95g per typical cup of kibble for accurate gram portions.

The Veterinary Formula

RER = 70 × (kg)0.75

Daily kcal = RER × MER multiplier

MER multipliers: Inactive senior 1.2 · Adult neutered 1.6 · Adult intact 1.8 · Active adult 2.0–3.0 · Working dog 2.0–8.0 · Pregnant 1.6–2.0 · Lactating 4.0–8.0 · Puppy < 4 mo 3.0 · Puppy 4–12 mo 2.0. Source: National Research Council (2006), Nutrient Requirements of Dogs and Cats.

Frequently Asked Questions

It depends on weight, life stage, activity, and body condition. Use the calculator above for a precise number. As a rule of thumb, a typical 15 kg adult neutered dog needs around 850 kcal per day.
RER (Resting Energy Requirement) is what your dog burns at rest. MER (Maintenance Energy Requirement) takes RER and multiplies it by a factor for activity, age, and reproductive status.
Outdoor and working dogs may need 10–25% more calories in cold months, but indoor dogs usually do not. Reassess body condition every 2–4 weeks instead of guessing by season.
Find the kcal/cup printed on your food bag. Divide your dog's daily calorie target by that value. Most dry kibbles are 350–450 kcal per cup; wet food typically holds 350–550 kcal per can.
The formula works for most breeds within ±5%, but extreme cases (sled dogs, sighthounds, brachycephalic giants) may need vet-supervised adjustment. Always verify with body condition score.