A strength training session generally burns fewer calories per minute than intense continuous exercise, but the calorie expenditure varies too widely to be summarized by a single figure. Body weight, total duration, rest periods, the type of exercises, how close one gets to muscle failure, and whether the workout is organized into traditional sets, supersets, or a circuit all significantly affect the result.
For example, the 2024 Compendium of Physical Activities assigns 3.5 METs to a multi-exercise session of 8 to 15 repetitions, 5.8 METs to a superset circuit, and 6 METs to vigorous strength training.
For a 75-kg athlete exercising for 60 minutes, these levels correspond approximately to 276, 457, and 473 total kcal using the conventional MET formula.
The Protéalpes calculator therefore does not claim to directly measure energy expenditure. It classifies the workout into a physiological category, customizes the calculation, and displays a central estimate along with a range, rather than an artificially precise result.
Key point: The result is an estimate of the energy expenditure during the workout. An accurate experimental measurement requires gas exchange analysis, and strength training also involves an anaerobic component that is difficult to quantify using an online tool.
Why do two workouts of the same duration burn different numbers of calories?
An hour of powerlifting with three to five minutes of recovery is not the same as an hour of full-body circuit training.
The first involves short, very intense bursts separated by long breaks, while the second maintains a higher oxygen consumption rate for most of the session.
| Factor | Expected impact on spending | Example |
|---|---|---|
| Body weight | A higher displaced mass generally increases the absolute cost | Two athletes performing the same workout do not achieve the same result |
| Rest time | Short breaks increase intensity and calories burned per minute | Supersets vs. Traditional Sets |
| Muscles Used | Multi-joint movements engage more active tissue | Squats or Deadlifts vs. Isolated Curls |
| Relative effort | The likelihood of failure increases the cost of a series | RPE 9 vs. RPE 6 with the same load |
| Organization | A circuit limits periods of low activity | Full-body workout with minimal rest |
Tonnage—calculated as load × repetitions × sets—is not enough. It does not account for range of motion, body mass moved, contraction duration, isometric work, movement efficiency, or recovery time.
Relative load remains a useful metric for describing training, particularly when using the Protéalpes 1RM calculator. However, it does not translate directly into calories burned.
What scientific principles does the calculator rely on?
The basis used is the Compendium of Physical Activities20241. One MET, or Metabolic Equivalent of Task, is conventionally defined as an energy expenditure of approximately 3.5 ml of oxygen per kilogram per minute, which is equivalent to the standardized resting metabolic rate.
| Type of activity | MET Value from the 2024 Compendium |
|---|---|
| Bodyweight Strength Training, General | 3,0 |
| Multi-exercise strength training, 8 to 15 repetitions | 3,5 |
| Moderate-paced tour | 5,0 |
| Squats or deadlifts, slow or explosive movements | 5,0 |
| Superset Circuit or Peripheral Heart Action | 5,8 |
| Intense weight training, powerlifting, or bodybuilding | 6,0 |
| High-Intensity Bodyweight Strength Training | 6,5 |
| A vigorous circuit with few rest periods | 7,5 |
| Kettlebell swings during the measured period | 9,8 |
Scientific note: 9.8 METs should not be applied to the entire session because it includes a few sets of kettlebell swings. The value refers to the period during which this activity is actually performed.
The calculator first selects an average MET based on the reported profile. Minor adjustments are then made to account for rest, perceived intensity, and the proportion of multi-joint exercises.
These adjustments serve as a transparent heuristic designed to classify the session within the categories of the Compendium. They do not correspond to a clinically validated formula for every combination of exercises.
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How are total calories and active calories calculated?
The conventional MET formula estimates gross expenditure as follows:
kcal per minute = MET × 3.5 × weight in kg ÷ 200
The result is then multiplied by the duration in minutes. For 75 kg, 60 minutes, and 3.5 METs, the estimate comes to approximately 276 kcal total.
| Result | What it represents | Example: 3.5 METs, 75 kg, 60 min |
|---|---|---|
| Total or Gross Calories | Energy expended over the entire period, including rest periods | About 276 kcal |
| Active or Net Calories | Expenditure greater than it would have been at rest | About 197 kcal using the standardized rest method |
This distinction explains some of the differences between fitness trackers and watches. Some display total energy expenditure, while others subtract the energy the body would have consumed without exercise.
In advanced mode, the tool estimates resting metabolic rate based on age, gender, height, and weight. The Protéalpes basal metabolic rate calculator allows you to compare several equations, including the Mifflin–StJeor2 equation.
What parameters should be entered to improve the estimate?
The quick mode identifies the variables that account for most of the observable differences between two sessions. The advanced mode adds physiological data and provides a more detailed description of the intensity of the workout.
| Quick Mode | Advanced mode |
|---|---|
| Weight | Age, Gender, and Height |
| Total duration | Number of sets and average duration of a set |
| Session Type | Average RPE or repetitions in reserve |
| Average rest time | Duration of the warm-up |
| Perceived intensity | Optional average heart rate |
| Proportion of multi-joint movements | Personalized Estimate of Rest Expenditure |
Heart rate remains a secondary variable.
In weight training, muscle contractions, intrathoracic pressure, rest periods, and changes in exercises disrupt the relationship between heart rate and oxygen consumption more than they do in running or cycling.
The number of sets provides a more detailed description of the workout, but it does not, on its own, yield a reliable energy expenditure value. A set of ten squats performed close to failure does not have the same energy cost as ten lateral raises performed with several repetitions left in reserve.
- RPE 4 to 5: light effort, far from failure.
- RPE 6 to 7: moderate effort, several repetitions possible.
- RPE 8: difficult set, with about two repetitions left in reserve.
- RPE 9–10: A very difficult set or one designed to lead to failure.
Why is the result still a range?
Indirect calorimetry primarily measures oxygen and carbon dioxide exchange. It is well-suited for aerobic components, but the glycolytic contribution of short, intense efforts makes it more difficult to estimate energy expenditure during a resistance training session.
Smartwatches do not eliminate this uncertainty. O’Driscoll’s systematic review, published in2020³, concludes that the accuracy of energy estimates varies widely depending on the device, the activity, and the protocol.
| Data Entered | Conservative range |
|---|---|
| Weight and duration only | Approximately ±30% |
| Type, Duration, and Intensity | Approximately ±25% |
| Rest, sets, and physiological profile added | Approximately ±20% |
These margins reflect conservative design choices and are not validated confidence intervals for each user. They highlight the uncertainty that would otherwise be masked by a result reported to the nearest calorie.
Is the afterburn effect added to the total?
No. EPOC refers to oxygen consumption that remains temporarily higher than at rest following exercise.
The study by Schuenke, Mikat, andMcBride⁴, published in 2002, observed a prolonged increase following a very demanding protocol: four circuits of bench press, shoulder press, and squats, performed at 10RM to failure in seven young men. This specific protocol does not justify automatically adding 10 or 15% to every workout.
Disclaimer: The afterburn effect does exist, but its magnitude depends on volume, intensity, recovery times, and the athlete’s profile. The calculator excludes it from the main result to avoid creating a false sense of precision.
How should this expenditure be interpreted in terms of body composition goals?
A strength-training session contributes to daily energy expenditure, but weight loss depends on maintaining a calorie deficit over time. Muscle gain depends on progressive training, a consistent energy intake, and sufficient protein intake.
| Objective | Reasonable Use of the Estimate | Mistakes to Avoid |
|---|---|---|
| Fat Loss | Monitor the weekly trend and adjust your intake based on your actual weight changes | Systematically subtract or "eat back" every calorie listed |
| Maintenance | Compare Similar Training Weeks | Treating a single session as an exact measurement |
| Weight gain | Incorporate exercise into your daily routine and then track your progress | Creating an Excessive Surplus Based on a One-Time Estimate |
The Protéalpes feature on gaining weight details the relationship between training, energy intake, and changes in body weight. For a fat-loss phase, the fat-loss macronutrient calculator helps you factor the energy expended during a workout into your total daily caloric intake.
Calorie expenditure alone does not indicate anything about protein recovery or synthesis. The protein intake calculator provides a separate guideline based on weight, athletic activity, and goals.
A Few Reminders
- Compare the results from sessions with a similar structure.
- Track weight, performance, and recovery simultaneously.
- Adjust caloric intake based on trends observed over several weeks.
- Do not change the diet based on a single estimate.
Scientific references and sources
2A New Predictive Equation for Resting Energy Expenditure in Healthy Individuals by Mark D. Mifflin et al.
3How Well Do Activity Monitors Estimate Energy Expenditure? A Systematic Review and Meta-analysis of the Validity of Current Technologies by Ruairi O’Driscoll et al.
4Effect of an Acute Period of Resistance Exercise on Excess Post-Exercise Oxygen Consumption: Implications for Body Mass Management by Mark D. Schuenke, Richard P. Mikat, and Jeffrey M. McBride
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