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This table is based upon a dog's Resting Energy Requirements or RER. The RER is the basic amount of energy that a dog would use in a day while remaining at rest. The formula to calculate RER for animals between 2 and 45 kg (5 - 99 pounds) is: RER in kcal/day = 30(body weight in kilograms) + 70. Any activity or variable other than rest will require an increase in energy (RER) and an increase in calories to meet the energy needs. Realize that these numbers are not a reflection of maintenance calories but of resting energy levels.
Answered by The Community. Making the world better, one answer at a time. The key is to convert daily caloric intake (which is assumed to be the same as the body's daily energy use) and covert that to joules. Lets assume your body uses 2500 calories in one day.One calorie is = 4.2Joules. 250,000 calories x (4.2J / calorie) = 10,500kJ per day.he key is to convert daily caloric intake (which is assumed to be the same as the body's daily energy use) and covert that to joules. Lets assume your body uses 2500 calories in one day. One calorie is = 4.2Joules.