Resting Burn Rate Calculator

Resting Burn Rate Calculator

Male Female

Your Resting Metabolic Rate (BMR)

This is the number of calories your body burns every 24 hours just to maintain basic life functions (breathing, circulation, cell production) while at complete rest.

function calculateBurnRate() { var gender = document.getElementById("rbc_gender").value; var weight = parseFloat(document.getElementById("rbc_weight").value); var height = parseFloat(document.getElementById("rbc_height").value); var age = parseFloat(document.getElementById("rbc_age").value); var resultBox = document.getElementById("rbc_result_box"); var resultDisplay = document.getElementById("rbc_main_result"); if (isNaN(weight) || isNaN(height) || isNaN(age) || weight <= 0 || height <= 0 || age <= 0) { alert("Please enter valid positive numbers for weight, height, and age."); return; } var bmr = 0; // Mifflin-St Jeor Equation if (gender === "male") { bmr = (10 * weight) + (6.25 * height) – (5 * age) + 5; } else { bmr = (10 * weight) + (6.25 * height) – (5 * age) – 161; } resultDisplay.innerHTML = Math.round(bmr).toLocaleString() + " Calories/Day"; resultBox.style.display = "block"; }

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What is a Resting Burn Rate?

The resting burn rate, scientifically known as the Basal Metabolic Rate (BMR), represents the minimum amount of energy (measured in calories) your body requires to function while at rest. Even when you are sleeping or sitting perfectly still, your body is hard at work performing vital tasks like pumping blood, regulating body temperature, and repairing cells.

How the Calculation Works

This calculator utilizes the Mifflin-St Jeor Equation, which is currently considered the most accurate standard for predicting metabolic rate in healthy adults. The formula accounts for four primary biological factors:

• Weight: Heavier bodies require more energy to maintain tissue.
• Height: Taller individuals typically have a larger surface area and lean body mass, increasing energy needs.
• Age: Muscle mass naturally tends to decrease as we age, which can slow the resting burn rate.
• Biological Gender: Generally, men possess more lean muscle mass than women, which leads to a higher caloric burn at rest.

Real-World Examples

Understanding your resting burn rate provides a baseline for weight management. Here are two realistic scenarios:

• Example 1: A 35-year-old male weighing 85kg and standing 180cm tall has a resting burn rate of approximately 1,830 calories per day.
• Example 2: A 28-year-old female weighing 60kg and standing 165cm tall has a resting burn rate of approximately 1,345 calories per day.

BMR vs. TDEE: What's the Difference?

It is important to remember that your BMR is not the total number of calories you should eat in a day. To find your Total Daily Energy Expenditure (TDEE), you must multiply your resting burn rate by an activity factor:

Activity Level	Multiplier
Sedentary (Little to no exercise)	BMR x 1.2
Lightly Active (1-3 days/week)	BMR x 1.375
Moderately Active (3-5 days/week)	BMR x 1.55
Very Active (6-7 days/week)	BMR x 1.725

Factors That Can Increase Your Burn Rate

While age and height are fixed, you can influence your resting burn rate through lifestyle choices. Increasing Lean Muscle Mass is the most effective way to raise your BMR, as muscle tissue burns significantly more calories at rest than fat tissue does. Other factors like thyroid function, ambient temperature, and temporary illness can also cause fluctuations in your daily energy requirements.