Calories Burned Weight Lifting Calculator

This calculator relies on the Metabolic Equivalent of Task (MET) standard established by exercise physiologists. A MET represents the ratio of your working metabolic rate to your resting metabolic rate. For weight training, MET values generally range from 3.0 for light, circuit-based lifting to 6.0 or higher for heavy, vigorous powerlifting. The core equation calculates total calories burned using the formula: Calories = Time (in minutes) × MET × 3.5 × Your Weight (in kg) ÷ 200. To find your hourly burn rate, substitute 60 minutes into the equation, which scales your energy expenditure to a full hour of continuous lifting.

Let's calculate the total energy burned for a person weighing 100 kg (approximately 220 lbs) who performs a moderate-to-vigorous weight lifting session for 45 minutes using a MET value of 5.0. First, apply the formula: 45 minutes × 5.0 MET × 3.5 × 100 kg ÷ 200. Multiplying the numerator gives 78,750, and dividing by 200 yields a total of approximately 393.75 calories burned during the 45-minute workout. To find the hourly burn rate, compute 60 × 5.0 × 3.5 × 100 ÷ 200, which equals 525 calories per hour.

To maximize accuracy, avoid counting total gym time as active lifting time; rest periods between sets significantly lower your overall caloric burn compared to continuous cardio. Choose a lower MET value if your routine involves long intervals of rest or lower intensity machine work, and reserve higher MET values for intense compound movements like squats and deadlifts performed with minimal rest. Remember that building muscle mass also increases your basal metabolic rate over time, helping you burn more energy even when you are at rest.