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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.
Answers. Best Answer: okay, the key is to convert daily caloric intake (which is assumed to be the same as the bodies daily energy use) and covert that to joules. lets assume your body uses 2500 calories in one day.Food calories are actually measured in kilocalories.(Ambiguous much?) one calorie is = 4.2Joules 250,000 calories x (4.2J / calorie) = 10,500kJ per day Watts = Joules/second Your body uses 10,500kJ in one day.One day has 86,400 seconds. About 120 watts.ood calories are actually measured in kilocalories. (Ambiguous much?) one calorie is = 4.2Joules 250,000 calories x (4.2J / calorie) = 10,500kJ per day Watts = Joules/second Your body uses 10,500kJ in one day.