Male Basal Metabolic Rate Calculator

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Male Basal Metabolic Rate (BMR) Calculator

function calculateBMR() { var weight = document.getElementById("weight").value; var height = document.getElementById("height").value; var age = document.getElementById("age").value; var resultDiv = document.getElementById("result"); if (isNaN(weight) || weight <= 0 || isNaN(height) || height <= 0 || isNaN(age) || age <= 0) { resultDiv.innerHTML = "Please enter valid positive numbers for all fields."; return; } // Mifflin-St Jeor Equation for men: BMR = (10 * weight in kg) + (6.25 * height in cm) – (5 * age in years) + 5 var bmr = (10 * parseFloat(weight)) + (6.25 * parseFloat(height)) – (5 * parseFloat(age)) + 5; resultDiv.innerHTML = "Your estimated Basal Metabolic Rate (BMR) is: " + bmr.toFixed(2) + " kcal/day"; }

Understanding Your Basal Metabolic Rate (BMR)

Your Basal Metabolic Rate (BMR) represents the minimum number of calories your body needs to perform essential life-sustaining functions while at rest. These functions include breathing, circulating blood, cell production, and basic brain activity. Essentially, it's the energy your body burns just to keep you alive and functioning when you're not engaged in any physical activity.

For men, the BMR can be estimated using various formulas, with the Mifflin-St Jeor equation being one of the most widely accepted and accurate. This equation takes into account key physiological factors:

  • Weight (in kilograms): A heavier body generally requires more energy to maintain its functions.
  • Height (in centimeters): Body mass distribution and surface area can influence metabolic rate.
  • Age (in years): Metabolic rate tends to naturally decrease with age.

The Mifflin-St Jeor equation for men is calculated as follows:

BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5

Understanding your BMR is a fundamental step in managing your weight and overall health. It forms the baseline for calculating your total daily energy expenditure (TDEE), which considers your BMR plus the calories burned through physical activity. By knowing how many calories your body burns at rest, you can make more informed decisions about your diet and exercise plan to achieve your health goals, whether it's weight loss, weight gain, or maintenance.

Example: Let's calculate the BMR for a 30-year-old male who weighs 75 kg and is 175 cm tall.

BMR = (10 × 75) + (6.25 × 175) – (5 × 30) + 5 BMR = 750 + 1093.75 – 150 + 5 BMR = 1798.75 kcal/day

This means that this individual needs approximately 1798.75 calories per day to maintain basic bodily functions at rest.

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