A DER (Daily Energy Requirement) calculator is one of the best ways to determine how much to feed a dog because it is based on science, not guesswork. Instead of relying on generic feeding charts, a DER calculator estimates your dog’s actual energy needs based on body weight, life stage, and activity level.

Step 1: Calculating RER (Resting Energy Requirement)

The standard formula for RER is:
RER = 70 × (body weight in kg)^0.75

For example, if a dog weighs 20 kg (44lbs):
RER = 70 × (20^0.75)
RER ≈ 662 kcal/day

This number represents the baseline energy requirement if the dog were resting all day.

Step 2: Determining DER (Daily Energy Requirement)

Common multipliers include:​

• Neutered adult: RER × 1.6​

• Intact adult: RER × 1.8

• Weight loss: RER × 0.8

• Weight gain: RER × 1.2–1.4

• Active/working dogs: RER × 2.0+

If our example pup was a neutered adult & moderately active: DER = 662 × 1.6 × 1 ≈ 1,059 kcal/day

This is the estimated number of calories the dog should consume daily.

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Some Top Reasons DER Calculators Are Ideal for Raw Feeding:

• Personalized energy needs – DER is calculated from your dog’s Resting Energy Requirement (RER) and adjusted for life stage and activity level, giving a feeding amount based on true metabolic demand, not a generic percentage of body weight.

• Prevents overfeeding on calorie-dense raw diets – Raw food can be energy-rich, and small portion differences can significantly impact weight. DER provides a precise daily calorie target to maintain ideal body condition.

• Supports growth, performance, and weight goals – Whether feeding puppies, breeding dogs, working dogs, or managing weight loss, DER allows structured calorie adjustments to safely meet changing energy demands.