Low (e.g., light weights, few sets)
Moderate (e.g., challenging weights, 3-4 sets)
High (e.g., heavy weights, short rests, high effort)
Estimated Calories Burned:
0kcal
Understanding Weight Training Calorie Burn
Weight training, also known as resistance training, is crucial for building muscle mass, improving bone density, and boosting metabolism. While it's often associated with strength gains, it also contributes significantly to calorie expenditure, both during the workout and in the hours that follow due to the "afterburn effect" (EPOC – Excess Post-exercise Oxygen Consumption).
The number of calories burned during a weight training session depends on several factors, including your body weight, the duration and intensity of your workout, and the specific exercises performed. This calculator provides an estimate based on common metabolic equivalents (METs) and user-provided details.
How the Calculation Works
The formula used in this calculator is a simplified estimation based on the concept of METs, which represent the energy cost of a physical activity relative to resting metabolic rate. The general formula for calculating calories burned is:
Calories Burned = (METs * Body Weight in kg * 3.5) / 200 * Duration in minutes
Where:
METs: A unit of measurement of the rate at which the body expends energy.
Body Weight in kg: Your current weight measured in kilograms.
Duration in minutes: The total time spent actively engaged in weight training.
The MET values used for different intensities are approximations:
Low Intensity: Approximately 3.0 METs
Moderate Intensity: Approximately 5.0 METs
High Intensity: Approximately 8.0 METs
Note: This formula provides an estimate. Actual calories burned can vary.
Factors Influencing Calorie Burn in Weight Training:
Intensity: Higher intensity (heavier weights, shorter rest periods, more complex movements) leads to a greater calorie burn.
Muscle Mass: Individuals with more muscle mass generally burn more calories at rest and during exercise, as muscle tissue is metabolically active.
Workout Structure: Circuit training or supersets, which minimize rest time, burn more calories per minute than traditional set-and-rest protocols.
Exercise Selection: Compound exercises (like squats, deadlifts, bench presses) that engage multiple muscle groups tend to burn more calories than isolation exercises.
EPOC (Afterburn Effect): High-intensity weight training significantly increases EPOC, meaning your body continues to burn calories at an elevated rate for hours after your workout to recover and rebuild muscle tissue. This calculator primarily estimates the calories burned *during* the session, not the full EPOC effect.
When to Use This Calculator:
To get a general understanding of the energy expenditure during your weight training sessions.
As part of a broader fitness tracking strategy, alongside diet and other forms of exercise.
To help balance your overall daily calorie intake and expenditure for weight management goals.
Remember, consistency and proper nutrition are key to achieving your fitness goals. This calculator is a tool to help inform your journey.
function calculateCalories() {
var weight = document.getElementById("weight").value;
var duration = document.getElementById("duration").value;
var intensity = document.getElementById("intensity").value;
var resultDiv = document.getElementById("result");
var resultValueSpan = document.getElementById("result-value");
var resultUnitSpan = document.getElementById("result-unit");
// Validate inputs
if (weight === "" || duration === "" || isNaN(weight) || isNaN(duration) || weight <= 0 || duration <= 0) {
alert("Please enter valid positive numbers for weight and duration.");
return;
}
var mets;
switch (intensity) {
case "low":
mets = 3.0;
break;
case "moderate":
mets = 5.0;
break;
case "high":
mets = 8.0;
break;
default:
mets = 5.0; // Default to moderate if something goes wrong
}
// Formula: Calories Burned = (METs * Body Weight in kg * 3.5) / 200 * Duration in minutes
var caloriesBurned = (mets * parseFloat(weight) * 3.5) / 200 * parseInt(duration);
resultValueSpan.textContent = caloriesBurned.toFixed(0); // Display whole number of calories
resultUnitSpan.textContent = "kcal";
resultDiv.style.display = "block";
}