BMR: The Basal Foundation BMR represents the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production. It is the baseline rate of energy expenditure of your body at rest.
AMR: Beyond the Basics AMR extends the BMR by accounting for your daily activities and exercise. Essentially, it is your BMR adjusted for your level of physical activity, providing a more comprehensive measure of your total caloric expenditure.
Formula of AMR and BMR Calculator
For Men and Women The BMR and AMR are calculated using formulas that factor in sex, weight, height, age, and physical activity level.
BMR Formula
- Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) – (5.677 × age in years)
- Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) – (4.330 × age in years)
AMR Formula (Harris-Benedict Equation) Depending on your activity level, multiply your BMR by the corresponding factor:
- Sedentary: BMR × 1.2
- Lightly active: BMR × 1.375
- Moderately active: BMR × 1.55
- Very active: BMR × 1.725
- Extra active: BMR × 1.9
BMR and AMR Table for a Standard Adult
| Gender | Age (Years) | Height (cm) | Weight (kg) | Activity Level | BMR (Calories/Day) | AMR (Calories/Day) |
|---|---|---|---|---|---|---|
| Male | 25 | 175 | 70 | Sedentary | 1665 | 1998 |
| Male | 25 | 175 | 70 | Lightly Active | 1665 | 2290 |
| Male | 25 | 175 | 70 | Moderately Active | 1665 | 2581 |
| Male | 25 | 175 | 70 | Very Active | 1665 | 2875 |
| Male | 25 | 175 | 70 | Extra Active | 1665 | 3164 |
| Female | 30 | 165 | 60 | Sedentary | 1389 | 1667 |
| Female | 30 | 165 | 60 | Lightly Active | 1389 | 1910 |
| Female | 30 | 165 | 60 | Moderately Active | 1389 | 2153 |
| Female | 30 | 165 | 60 | Very Active | 1389 | 2397 |
| Female | 30 | 165 | 60 | Extra Active | 1389 | 2640 |
Example of AMR and BMR Calculator
Scenario Calculation Consider a 30-year-old female, weighing 65 kg and 170 cm tall, engaging in moderate exercise. Here’s how you calculate her BMR and AMR:
- BMR = 447.593 + (9.247 × 65) + (3.098 × 170) – (4.330 × 30) = 1441.4655 calories/day
- AMR = 1441.4655 × 1.55 = 2234.27152 calories/day (Moderately active)
This shows her total caloric needs per day, helping her plan her diet and exercise more effectively.
Most Common FAQs
BMR calculates caloric needs assuming no physical activity, while AMR includes activity levels to provide a more accurate daily calorie requirement.
Recalculate your BMR and AMR if your weight, height, age, or activity level changes significantly, otherwise annually.
Absolutely! Knowing your BMR and AMR helps you manage calorie intake versus expenditure, a crucial element in weight loss.