Resistance training — whether with free weights, machines, resistance bands, or body weight — is one of the most effective ways to build strength, and it also burns calories. This calculator estimates how many calories you burn during a 20-minute resistance workout based on your body weight and the intensity of your session. Instead of guessing, you get a science-backed estimate derived from MET (metabolic equivalent) values used in exercise research.
Whether you're tracking daily energy expenditure, planning a weight-management program, or just curious about the cost of your gym session, this tool is designed for you. It works for light sessions (mobility and bands), moderate strength circuits, and vigorous heavy lifting. Results show gross calories, net calories above resting, and calories per minute so you can compare workouts and fine-tune your training.
Enter your body weight, choose the intensity that best matches your effort, and press Calculate. For more personalized estimates, you can optionally display net calories, which subtract the baseline energy you'd burn at rest.
🏋️ Resistance Workout Calorie Calculator
Estimate calories burned during a 20-minute resistance training session — weights, bands, bodyweight, or circuits.
Net calories show the extra energy used above your resting metabolic rate.
📊 Your Results
- Enter your details and select intensity.
How to Use This Tool
This calculator works best when you enter your actual body weight rather than an estimate, since calorie burn is directly proportional to the mass you move. Choose the unit you're comfortable with — kilograms or pounds — and use the preset buttons for quick entry.
- Enter your body weight in kilograms or pounds. The presets (60 / 70 / 80 / 90 kg) fill the field instantly and convert automatically if pounds are selected.
- Pick the intensity that best matches your 20-minute session. If you're not sure, Moderate is a safe default for general resistance training.
- Optionally check Show net calories to see calories above resting metabolism. This is useful if you're tracking how much extra energy a workout adds to your daily burn.
- Press Calculate to see your total calories, per-minute rate, and a step-by-step breakdown.
Formula Explained
Calorie estimates on this site use the standard MET (metabolic equivalent) formula from exercise physiology:
Energy (kcal) = MET × 3.5 × body weight (kg) ÷ 200 × minutes
A MET value describes how many times more energy an activity uses than sitting quietly at rest, where 1 MET is the resting baseline. For a 20-minute session, the formula simplifies to:
kcal in 20 min = MET × body weight (kg) × 0.35
For example, a 70 kg person doing moderate resistance training (MET 3.5) burns 3.5 × 70 × 0.35 = 85.8 kcal. The calculator uses MET values adapted from the Compendium of Physical Activities, a widely cited research resource.
Gross calories include the calories you would have burned anyway at rest. Net calories subtract the resting baseline (approximately 1 MET) to estimate the additional energy cost of the workout:
Net kcal = (MET − 1) × body weight (kg) × 0.35
Worked Examples
Example 1: Moderate session, 70 kg — MET 3.5. Per minute: 3.5 × 3.5 × 70 ÷ 200 = 4.29 kcal/min. Total for 20 minutes: 85.8 kcal. With net calories checked: (3.5 − 1) × 70 × 0.35 = 61.3 kcal extra.
Example 2: Vigorous lifting, 60 kg — MET 6.0. Total: 6.0 × 60 × 0.35 = 126 kcal. Per minute: 6.3 kcal/min. Net: (6 − 1) × 60 × 0.35 = 105 kcal.
Example 3: Light band work, 80 kg — MET 3.0. Total: 3.0 × 80 × 0.35 = 84 kcal. Even at a higher body weight, the per-minute burn is only 4.2 kcal because the effort is light.
Reference: MET Values for 20 Minutes
Use the table below to see how intensity changes calorie burn for a 70 kg person. Your results will scale linearly with your weight.
| Intensity | Typical examples | MET | kcal / 20 min (70 kg) |
|---|---|---|---|
| Light | Easy band work, mobility drills, low-load high-rep sets | 3.0 | 73.5 |
| Moderate | General resistance training, machine weights, moderate circuits | 3.5 | 85.8 |
| Vigorous | Heavy free weights, high-intensity circuit training | 6.0 | 147.0 |
| Very vigorous | Intense calisthenics, CrossFit-style resistance circuits | 8.0 | 196.0 |
MET values are population averages; individual effort can vary by ±20% or more from one workout to the next.
Factors That Affect Accuracy
MET-based estimates are a convenient starting point, but real calorie burn depends on several individual factors:
- Muscle mass: More muscle tissue raises resting metabolism and makes the same exercise slightly more costly.
- Effort and tempo: Slow, controlled reps with short rest periods burn more than loose form with long breaks. The MET values assume sustained effort for the full 20 minutes.
- Body composition: The formula uses total weight, but two people of the same weight with different body composition will not burn identical calories.
- Exercise selection: Compound lifts (squats, deadlifts, presses) recruit more muscle and burn more than isolated machine movements.
- Age and sex: These influence resting metabolic rate, though the effect on a single session is modest.
- Afterburn (EPOC): Resistance training elevates oxygen consumption for hours afterward. This calculator counts only the 20-minute session itself, not the additional recovery cost.
Frequently Asked Questions
How many calories do I burn in 20 minutes of resistance training? Most people burn between 60 and 150 kcal during a focused 20-minute resistance session. A 70 kg person burns roughly 86 kcal at moderate effort and about 147 kcal at vigorous effort. The exact number depends on your weight and how hard you push.
Should I count gross or net calories? It depends on your goal. Gross calories reflect the total energy your body used during the workout, which is what you'd see on a typical fitness tracker. Net calories tell you how much extra the workout added above resting, which is often more relevant for weight-loss planning. This calculator lets you view both.
Can I use this for bodyweight exercises? Yes. Bodyweight workouts are a form of resistance training. Choose Very vigorous for intense calisthenics (push-ups, pull-ups, squat jumps) and Moderate for a steady bodyweight strength circuit.
Is resistance training better than cardio for burning calories? Cardio often burns more calories per minute during the activity, but resistance training builds muscle, boosts resting metabolism, and produces a meaningful afterburn. For total daily energy expenditure, the best program usually includes both. If you're comparing options, try our vigorous walking calculator or 25-minute cycling calculator for other activities.
Why does my fitness tracker give a different number? Wearables estimate using heart rate and movement patterns, while this calculator uses generic MET values. Differences of 10–30% are normal. Use the method that feels consistent and watch trends over time.