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AMR and BMR Calculator Online

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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.

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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
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BMR and AMR Table for a Standard Adult

GenderAge (Years)Height (cm)Weight (kg)Activity LevelBMR (Calories/Day)AMR (Calories/Day)
Male2517570Sedentary16651998
Male2517570Lightly Active16652290
Male2517570Moderately Active16652581
Male2517570Very Active16652875
Male2517570Extra Active16653164
Female3016560Sedentary13891667
Female3016560Lightly Active13891910
Female3016560Moderately Active13892153
Female3016560Very Active13892397
Female3016560Extra Active13892640

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)
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This shows her total caloric needs per day, helping her plan her diet and exercise more effectively.

Most Common FAQs

What is the difference between BMR and AMR?

BMR calculates caloric needs assuming no physical activity, while AMR includes activity levels to provide a more accurate daily calorie requirement.

How often should I recalculate my BMR and AMR?

Recalculate your BMR and AMR if your weight, height, age, or activity level changes significantly, otherwise annually.

Can these calculators help me lose weight?

Absolutely! Knowing your BMR and AMR helps you manage calorie intake versus expenditure, a crucial element in weight loss.

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