Free tool · Infrared sauna
Infrared sauna calorie calculator.
How many calories does an infrared sauna burn? Add your weight and your minutes in the heat for an honest estimate, with the math shown. Short version: a little more than sitting still, and the lighter number on the scale afterward is mostly water.
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Your estimate · 30 min in the heat
40to47 calories in 30 minutes in the heat
calories in total
- Sitting still, no heat
- about 36
- Extra from the heat
- +4 to 11
For scale: that's the same as sitting on the couch for about 33 to 39 minutes.
- Lighter on the scale afterward? That's mostly sweat, and it comes back when you drink.
- Resting rate from the MET convention: about 1 calorie per kilogram per hour. Heat adds 10 to 30%. See the math
An estimate for healthy adults, not a measurement and not medical advice. Heat is real stress on the body: if you are pregnant, have a heart condition or any medical concern, check with your doctor before using a sauna.
The method
Calories burned in an infrared sauna, step by step.
No black box. Here is exactly how the calculator gets its number, so you can check it, or do it on a napkin.
The formula
calories = resting calories per hour × hours in the heat × 1.1 to 1.3
Worked example
160 lb (72.6 kg), 30 minutes, no personal details. Resting: 72.6 × 1 × 0.5 = 36 calories. With the heat: 40 to 47 calories, of which 4 to 11 come from the heat.
- 1
Start with your resting rate
With your age, height and sex, we use the Mifflin-St Jeor equation, a standard way to estimate the energy you use at rest. Without them, we use the MET convention from the Compendium of Physical Activities: sitting quietly is 1.0 MET, about 1 calorie per kilogram of body weight per hour. That convention runs a little high for many adults, one more reason to add your details.
- 2
Multiply by your time in the heat
Only the minutes you actually spend on the sauna bench. Plunges, breaks and the shower are not counted.
- 3
Add a modest amount for the heat
We add 10 to 30% on top of resting. The best measurement we found: metabolic rate rose 25 to 33% in men sitting in a traditional sauna at 176°F (80°C) for an hour. Infrared cabins usually run cooler and sessions are shorter, so we treat that as the top of the range. When researchers measured the cost of extra heat during a workout, it came to roughly 5 to 9%.
Sources
- 01Herrmann SD, Willis EA, Ainsworth BE, et al. 2024 Adult Compendium of Physical Activities: a third update of the energy costs of human activities. Journal of Sport and Health Science, 2024.Sitting quietly (code 07021) is 1.0 MET; fidgeting while sitting (07022) is 1.5 MET; 1 MET is about 1 kcal per kg per hour.
- 02Mifflin MD, St Jeor ST, Hill LA, et al. A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition, 1990;51(2):241-247.The resting-energy equation used when you add age, height and sex.
- 03Leppäluoto J, Tuominen M, Väänänen A, et al. Some cardiovascular and metabolic effects of repeated sauna bathing. Acta Physiologica Scandinavica, 1986;128(1):77-81.Metabolic rate up 25 to 33% in a Finnish sauna at 80°C for an hour; pulse up from 75 to 80 to 106 to 116 beats a minute; body weight down 0.7 to 0.9 kg per session. Sets the top of our range.
- 04Matthews ARD, Astorino TA, Crocker GH, Sheard AC. Acute effects of high-intensity interval exercise while wearing a sauna suit on energy expenditure and excess post-exercise oxygen consumption. Journal of Strength and Conditioning Research, 2022;36(9):2427-2433.Measured oxygen use: added heat raised energy use by roughly 5 to 9%, about 23 kcal in total.
- 05Ketelhut S, Ketelhut RG. The blood pressure and heart rate during sauna bath correspond to cardiac responses during submaximal dynamic exercise. Complementary Therapies in Medicine, 2019;44:218-222.During 25 minutes at 93°C, heart rate and blood pressure rose to levels matching moderate exercise (60 to 100 watts); blood pressure fell below baseline afterward.
- 06Kriemler S, Hebestreit H, Bar-Or O. Temperature-related overestimation of energy expenditure, based on heart-rate monitoring in obese boys. European Journal of Applied Physiology, 2002;87(3):245-250.Warm conditions push heart rate up and inflate heart-rate-based calorie estimates.
- 07Podstawski R, Borysławski K, Clark CCT, et al. Correlations between repeated use of dry sauna for 4 x 10 minutes, physiological parameters, anthropometric features, and body composition in young sedentary and overweight men. BioMed Research International, 2019.Reported 73 to 131 kcal per 10-minute round, estimated with wrist heart-rate monitors (a limitation the authors note).
Why yours is different
What changes your number.
- 01
Your size
Bigger bodies use more energy at rest, so the estimate scales with your weight.
- 02
Time in the heat
Twice the minutes, about twice the calories. Count time on the bench only, not the plunge or the shower.
- 03
Your resting rate
Age, height and sex shift how much energy you use at rest. Add them in the calculator for a personal number.
- 04
How hot you get
A hotter cabin, longer rounds or sitting close to the panels warm you more, which likely nudges the number up. That is why we show a range.
- 05
Moving around
Sitting still is the baseline. Fidgeting or stretching adds a little: the Compendium puts fidgety sitting at 1.5 MET, against 1.0 for sitting quietly.
- 06
Your watch
Heart-rate trackers read a fast pulse as effort. In the heat your pulse climbs to move warmth to your skin, so tracker numbers tend to run high.
Common myths
Big numbers, honest answers.
Myth
“A session burns 400 to 600 calories.”
What's true
You will see numbers like this all over the internet. Measured responses point to a modest rise above resting: for most people, the heat adds tens of calories to a typical session, not hundreds.
Myth
“My watch says I burned 300.”
What's true
Heat really does work your heart: in a 2019 study, heart rate and blood pressure in a 200°F (93°C) sauna rose to levels that matched moderate exercise. But your muscles are resting, and most watches turn heart rate into calories as if they weren't. Researchers have shown warm conditions make those estimates run high. A 2019 sauna study that reported 73 to 131 calories per 10-minute round got its numbers from wrist heart-rate monitors, and its authors listed that as a limitation.
Myth
“I'm two pounds lighter, so it worked.”
What's true
That is sweat. In a 1986 study, an hour in a 176°F (80°C) sauna dropped body weight by 0.7 to 0.9 kg, about 1.5 to 2 pounds, each time. It is water, and it comes back when you drink.
Myth
“Hotter and longer burns more fat.”
What's true
A sauna is not a fat-burning tool. Staying longer mostly means more sweat to replace. Come for the heat and the quiet, and get out whenever you feel dizzy or unwell.
Questions people ask.
New to infrared? Start with how to prepare for your first session, or see what a visit costs on our pricing page.
Ready to try the heat for yourself? Book a private infrared sauna in San Diego or the Temecula infrared sauna, each with its own cold plunge and shower.
How many calories does an infrared sauna burn in 30 minutes?
Using our method, a 155-pound adult burns about 39 to 46 calories in 30 minutes of heat, roughly 4 to 11 more than sitting still at room temperature. Your number depends on your size, your resting rate and how long you stay in.
Does an infrared sauna burn fat?
It is not a fat-burning tool. Sitting in the heat uses a little more energy than sitting still, and the weight you see drop afterward is mostly water that comes back when you drink. Come for the heat and the quiet, not for a number.
Why does my heart race in the sauna?
Your body moves blood toward your skin to shed heat, so your heart beats faster. In a 1986 study, pulse rose from about 75 to 80 beats a minute to 106 to 116 after an hour in a hot sauna, and in a 2019 study, heart rate and blood pressure during a 25-minute session matched moderate exercise. That is real work for your heart, but your muscles are resting, which is why the calorie cost stays modest.
Why do I weigh less after a sauna?
Because you sweat. In one study, an hour in a 176°F (80°C) sauna dropped body weight by 0.7 to 0.9 kg each time, and the researchers treated it as fluid loss. Drink water before and after, and the scale settles back.
Is it different in a traditional sauna?
Traditional saunas usually run hotter than infrared cabins, so the rise above resting may be a little larger. The best measurement we found, a 25 to 33% rise, came from a hot traditional sauna, which is why it sets the top of our range.
Does the cold plunge burn calories too?
This calculator counts the heat only. A plunge usually lasts a minute or two, and we have not found reliable measurements for a dip that short, so we leave it out rather than guess.
How accurate is this calculator?
It is an estimate, which is why it shows a range. Resting-energy equations describe averages and can miss for any one person, and the heat adjustment rests on a small number of studies. Treat it as a ballpark, not a measurement.
Should I stay in longer to burn more?
Please don't stretch a session for calories. Get out if you feel dizzy, lightheaded or unwell, drink water before and after, and skip alcohol. If you are pregnant, have a heart condition or any medical concern, check with your doctor first.
Keep reading
Infrared vs traditional saunaHow each one heats, how it feels, typical temperatures, and who tends to prefer which.Read the guide 
How long to stay in the sauna and plungeSensible time ranges for heat and cold, and how to tell when you have had enough.Read the guide - Private infrared saunaWhat a session in your own infrared sauna is like, from the first minute to the shower.Read more
Come for the heat, not the math.
Private infrared sauna, cold plunge and shower. 25, 55 or 85 minutes.