28/05/2024
Human
The formula to estimate daily calorie needs is:
*Harris-Benedict Equation*
For men: 66 + (6.2 x weight in lbs) + (12.7 x height in inches) - (6.8 x age in years)
For women: 655 + (4.35 x weight in lbs) + (4.7 x height in inches) - (4.7 x age in years)
*Mifflin-St Jeor Equation* (more accurate)
For men: (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5
For women: (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) - 161
*Daily Calorie Needs* = BMR (from above) x activity factor
Activity factors:
- Sedentary (little or no exercise): 1.2
- Lightly active (light exercise/sports 1-3 days/week): 1.375
- Moderately active (moderate exercise/sports 3-5 days/week): 1.55
- Very active (hard exercise/sports 6-7 days a week): 1.725
- Extremely active (very hard exercise/sports & physical job or 2x training): 1.9
For example, let's calculate the daily calorie needs for a 70 kg (154 lbs), 30-year-old male who is moderately active (1.55 activity factor):
Using the Mifflin-St Jeor equation: BMR = (10 x 70) + (6.25 x 175) - (5 x 30) + 5 = 1,987 calories
Daily Calorie Needs = 1,987 x 1.55 = approximately 3,081 calories
Keep in mind that these are estimates, and individual calorie needs may vary depending on specific circumstances.
Animals
The calorie requirements for animals can be calculated using various formulas, depending on the species and purpose (maintenance, growth, or production).
*Dogs:*
- MER (Maintenance Energy Requirement) = 70 x (body weight in kg)^0.75
- DER (Daily Energy Requirement) = MER x activity factor (1.2-1.8)
*Cats:*
- MER = 60 x (body weight in kg)^0.67
- DER = MER x activity factor (1.2-1.4)
*Horses:*
- DE (Digestible Energy) = 0.03 x (body weight in kg) + 1.43 x (body weight in kg)^0.75
*Cattle:*
- NE (Net Energy) = 0.077 x (body weight in kg)^0.75
*Pigs:*
- DE = 0.025 x (body weight in kg) + 1.26 x (body weight in kg)^0.75
*Chickens:*
- ME (Metabolizable Energy) = 0.023 x (body weight in kg) + 1.15 x (body weight in kg)^0.75
Note:
- These formulas are general estimates and may vary depending on specific circumstances.
- Body weight should be in kilograms (kg).
- Activity factors vary depending on the animal's level of activity (e.g., sedentary, moderately active, highly active).
- These formulas calculate the daily energy requirements in calories (kcal) or megacalories (Mcal).
Consult with a veterinarian or animal nutritionist for specific calculations and recommendations tailored to your animal.
