How many calories do you burn in a sauna?

Based on current scientific evidence, a typical sauna session appears to burnrelatively fewcalories: around 50 to 150 kcal over 30 minutes, with a few isolated studies reporting higher values under specific conditions.

Sauna Calorie Burner Calculator

Sans JavaScript, l’exemple ci-dessous correspond au chargement (30 min). Activez JavaScript pour recalculer. #sauna-restart-btn { display: none !important; }

Objective

Total time in the sauna

min

Conservative estimate for a traditional sauna: 2–4 kcal/min (30 min ≈ 60–120 kcal).

Number of calories to burn

kcal

Disclaimer: This is a theoretical estimate that can vary significantly depending on the individual and the conditions.

Calories burned

60–120 kcal

calories = minutes × (2 to 4 kcal/min)

Estimated weight loss

8–16 g

weight loss (g) = calories / 7700 × 1000

Calories per serving chart

Duration	Calories (range)
10 min	20–40 kcal
15 min	30–60 kcal
20 min	40–80 calories
25 min	50–100 kcal
30 min	60–120 kcal
45 min	90–180 kcal
1 h	120–240 kcal
1 hour and 30 minutes	180–360 kcal
2 h	240–480 kcal

How many calories do you burn in a sauna?

Several recent reviews indicate that a 15- to 30-minute session in a traditional sauna at 80–100 °C typically results in the burning of 50 to 100 kcal, which is equivalent to a slow walk.

A widely cited (but highly theoretical) "analytical" formula proposes:

calories ≈ weight (kg) × duration (min) × 0.02625

For 70 kg and 30 minutes, that comes to about 55 kcal, which is consistent with the estimates above.

A popular science article citing a study on sedentary young men reports a calorie expenditure of 73 to 134 kcal in just 10 minutes in a sauna, and extrapolates this to 300–500 kcal for 20–30 minutes; however, these figures are significantly higher than most conservative estimates and likely stem from specific experimental conditions or questionable extrapolations.

Promotional materials for saunas or infrared cabins sometimes claim that users burn 300 to 800 kcal per session, or even up to 1,000 kcal per hour, but these figures are not supported by robust independent studies and often confuse sweat loss (water) with actual energy expenditure, with a healthy dose of marketing thrown in.

Why consider sweat loss?

The use ofthe energy cost of sweat(0.586 kcal/g) is indeed taken from Guyton’s physiology textbook, which is a recognized scientific source. However, applying this directly to a sauna to claim a burn of 900–2,400 kcal per 30 minutes is a highly speculative extrapolation.

In a nutshell

Based on conservative estimates, therealistic rangefor a traditional sauna is approximately 2–4 kcal per minute for an average adult (30 min ≈ 60–120 kcal), which is well below the calorie burn of actual physical exercise;
Saunas are beneficial forrelaxation, circulation, recovery, and possibly certain cardiovascular markers, but they arenota significant tool for fat loss in and of themselves.

Why does the sauna help burn calories?

The sauna slightly increases energy expenditure through several physiological mechanisms:

Thermoregulation: Heat raises body temperature, and the body must expend energy to bring it back to normal (skin vasodilation, sweating, slight increase in heart rate);
Sweating: Producing sweat and allowing it to evaporate consumes energy, but this energy expenditure is minimal compared to active physical exercise; most of the “weight loss” observed after a sauna session consists mainly of water and salt, not fat;
A modest increase in basal metabolism: repeated exposure to heat may slightly increase resting metabolism, but the impact on daily calorie intake remains minimal.

High-quality sugar-free proteins

Cold microfiltration
Optimal digestibility
Unsweetened flavor
Without performance-enhancing substances
Gluten-free

Discover sugar-free whey

Why are there so few "official" figures in kcal?

Academic studies on saunas focus primarily on:

Cardiovascular parameters (blood pressure, heart rate, endothelial function);
Health effects (cardiovascular mortality, respiratory disorders, etc., particularly in large Finnish cohorts);
Body composition and sweating (water loss, electrolytes, sweating adaptations as in the 4 × 10-minute study);

On the other hand, few studies explicitly state “X kcal per 30 minutes in the sauna,” because:

Energy expenditure varies greatly depending on weight, body surface area, temperature, duration, type of sauna, and acclimatization;
Researchers are more interested inhealth effectsthan in the "weight loss" or calorie aspects.

Hence the current situation:

Reputable websites(Croq’Kilos, Moment Sport, Observatoire de la prévention) provide conservative estimates (50–100 kcal/30 min) that are consistent with physiological mechanisms;
Marketing websitessometimes extrapolate from the energy cost of sweating (Guyton, JAMA, cited in MaCommunauté) to claim 300–800 or 900–2,400 kcal, but these figures are not supported by indirect calorimetry studies conducted on humans in saunas.

Is a dry sauna worth it?

A sauna can be a useful addition to muscle-building, but it should never be the main focus of fat loss.

A session in a dry sauna, steam room, or hot bath slightly increases calorie expenditure by raising body temperature, heart rate, and blood circulation, but this increase remains minimal compared to regular physical activity.

Most studies show that the body mainly loses water, which temporarily reduces the weight on the scale without leading to a lasting reduction in body fat.

On the other hand, when combined with an exercise program and a balanced diet, the sauna can indirectly help during a cutting phase: it promotes deep relaxation, muscle recovery after a workout, and stress management, which helps maintain a more consistent exercise routine and a better quality of life on a daily basis.

Heat helps improve blood circulation and certain markers of cardiovascular health—factors that are beneficial when increasing training intensity and as the calorie deficit becomes more significant.

In short, the sauna is a valuable part of a healthy lifestyle as a ritual for recovery and well-being, but it is not a miracle solution for weight loss: actual weight loss depends on the balance between calorie intake and physical activity.