Resistance MET Calculator

How to Use This Tool

Using the Resistance MET Calculator is straightforward. Start by entering your body weight in either kilograms or pounds—the calculator will automatically convert to kilograms for the formula. Next, input the duration of your resistance training session, choosing minutes or hours. Then select the activity type that best matches your workout from the dropdown. The MET values are based on the Compendium of Physical Activities, a widely used reference for energy expenditure.

After clicking Calculate, you'll see three key outputs: the MET value for your selected activity, your estimated calories burned per minute, and the total calories burned for the entire session. A step-by-step breakdown shows exactly how the numbers were derived, so you can verify the math and understand the influence of each variable.

Formula Explained

The calculator uses the standard MET formula:

This equation comes from the American College of Sports Medicine (ACSM) metabolic calculations. The constant 3.5 represents the average resting oxygen consumption in milliliters per kilogram per minute (ml/kg/min). One MET is defined as the energy cost of sitting quietly, which equals 3.5 ml/kg/min of oxygen uptake. When you multiply MET by 3.5, you get the oxygen consumption for that activity, and dividing by 200 converts it to kilocalories per minute.

For example, a 70 kg person doing general weight lifting at a MET of 3.5 would burn:

Over 45 minutes, that's approximately 193 kcal. The same person doing vigorous bodybuilding (MET 6.0) would burn about 7.35 kcal/min, totaling 331 kcal in 45 minutes—a significant difference that highlights the importance of intensity.

Worked Examples

Let's walk through a few scenarios to illustrate how the calculator handles different inputs.

Example 1: Moderate weight lifting — A 155 lb (70.3 kg) person lifts weights for 60 minutes at moderate effort (MET 3.5). Calories per minute = 3.5 × 3.5 × 70.3 ÷ 200 = 4.31 kcal/min. Total = 4.31 × 60 = 259 kcal.

Example 2: Vigorous circuit training — An 80 kg person does circuit training (MET 5.0) for 30 minutes. Calories per minute = 5.0 × 3.5 × 80 ÷ 200 = 7.0 kcal/min. Total = 7.0 × 30 = 210 kcal.

Example 3: Light machine work — A 60 kg person uses resistance machines at light effort (MET 3.0) for 45 minutes. Calories per minute = 3.0 × 3.5 × 60 ÷ 200 = 3.15 kcal/min. Total = 3.15 × 45 = 142 kcal.

These examples show how both body weight and intensity directly affect the final number. Heavier individuals burn more calories for the same activity because more energy is required to move a larger mass.

Tips & Best Practices

• Be honest about intensity. The MET values assume a consistent effort level. If you're taking long rest periods, your actual average intensity may be lower than the selected category.
• Use a heart rate monitor for precision. MET estimates are population averages; individual metabolism varies. A heart rate monitor can give you a more personalized calorie count.
• Track your sessions. Logging your workouts and estimated calories can help you see progress over time and adjust your training volume.
• Combine with other metrics. Calories burned is just one measure. Strength gains, endurance, and body composition changes are equally important.

Factors Affecting Accuracy

Several factors can cause the estimate to differ from your actual energy expenditure. Your age, gender, fitness level, and body composition all influence metabolic rate. For instance, a well-trained athlete may burn fewer calories than the MET prediction because their body is more efficient at the movement. Conversely, a beginner might burn more due to less efficient technique. The MET values are also based on steady-state activity; resistance training often involves intermittent effort, which can lower the average intensity. Finally, the type of equipment and the specific exercises you perform can shift the energy cost. For these reasons, treat the result as a useful estimate rather than an exact measurement.

Frequently Asked Questions

What is a MET? MET stands for Metabolic Equivalent of Task. One MET is the rate of energy expenditure while sitting at rest. Activities are assigned MET values based on how many times more energy they require compared to rest.

Why does the calculator use 3.5 in the formula? The 3.5 represents the average resting oxygen consumption in ml/kg/min. This is a standard constant used in the ACSM metabolic equation to convert METs into calories.

Can I use this for other types of exercise? Yes, the same formula applies to any activity with a known MET value. You can find MET values for hundreds of activities in the Compendium of Physical Activities.

Is resistance training good for weight loss? Absolutely. While a single session may burn fewer calories than cardio, resistance training increases muscle mass, which raises your resting metabolic rate. This means you burn more calories throughout the day, even at rest.

How often should I do resistance training? The American College of Sports Medicine recommends training each major muscle group two to three times per week for most adults. Always allow at least 48 hours of rest between sessions for the same muscle group.

For more detailed guidance, consult the American College of Sports Medicine or the CDC's physical activity guidelines.