Step on a scale after a sauna and the number is lower. That is where the weight-loss claim comes from.
The claim falls apart when you ask what left your body. This article follows the numbers. It sits under our guide to sauna health benefits, which covers the claims with more evidence behind them. This is general information, not medical advice.
Short answer: no, not in the way people hope. The weight you lose in a sauna is water, and it comes back when you drink. A sauna can be a pleasant part of a routine that includes exercise. It doesn’t replace the exercise.
What the scale is measuring
Harvard Health puts a number on it: “The average person will pour out a pint of sweat during a short stint in a sauna.”
A US pint of water weighs about 1.04 pounds. That is my arithmetic: 16 fluid ounces at roughly 1.04 ounces per fluid ounce. So a short session can move the scale by about a pound.
Cleveland Clinic’s Dr. Amy Zack names what that pound is: “In the short term, because you’re sweating, you will lose water weight, but that is not weight loss, that is dehydration.”
The article she appears in advises against using a sauna as a weight-loss tool.
Why the weight comes back
Sweat is water with salts in it. You replace it by drinking, and every source here tells you to drink.
Cleveland Clinic: “make sure you drink water before and after a sauna session.” UCLA Health says to drink water before, during, and after.
Follow that advice and the pound returns within hours. Ignore it and you are dehydrated, which is the problem the advice exists to prevent.
But my heart rate goes up
It does. Harvard Health says the pulse rate “jumps by 30% or more” in a sauna. UCLA Health puts it at 100 to 150 beats per minute and compares the stress relief to “low or moderate exercise.”
A raised heart rate is not the same as a workout. None of the sources used here gives a calorie figure for a sauna session, so I won’t quote one. Be wary of any site that states a precise number without a study behind it.
What a sauna can add to a routine
UCLA Health reports that using a sauna “for 15 minutes after a workout, three times a week” improved blood pressure more than exercise alone. Cleveland Clinic notes that sore muscles often respond to heat.
So the honest pitch is this. A sauna may make the exercise habit easier to keep. The exercise and the food still do the weight work.
Sauna suits and sweating harder
A sauna suit works on the same principle as the sauna: it makes you sweat more. More sweat is more water lost, and the same quote from Dr. Zack applies. I found no source in this research that supports sauna suits for fat loss.
If you are buying for this reason
Don’t. Buy a sauna because you like the heat and will use it.
For reference, here is what three of the lower-priced saunas in our catalog cost.
| Model | Type | Price |
|---|---|---|
| Sunlighten Solo Dome | Portable infrared | $1,999 |
| Dynamic Andora | 2-person infrared cabin | $2,210.99 |
| Almost Heaven Salem | 2-person barrel sauna | $4,176 |
My rule of thumb: if weight loss is the only reason on your list, spend the money elsewhere. If relaxation and sore legs are on the list too, read the home sauna buying guide.
Safety
Cleveland Clinic suggests sessions of about 15 to 20 minutes, and says to avoid the sauna after alcohol or a recent heart attack or stroke. Check with a provider first if you are pregnant or have a heart or blood pressure condition. Never stay in longer to “sweat off” more weight.
Bottom line: a sauna removes water, not fat. The pound you lose is back by dinner. Use the sauna for how it feels, and talk to your doctor about weight loss itself.
Sources
- Cleveland Clinic, “Get Your Sweat On: The Benefits of a Sauna,” August 12, 2024: health.clevelandclinic.org
- Harvard Health Publishing, “Sauna Health Benefits: Are saunas healthy or harmful?” May 14, 2020 (opening section): health.harvard.edu
- UCLA Health, “Benefits of sauna bathing for heart health,” February 1, 2023: uclahealth.org
- Sunlighten, Dynamic Saunas, and Almost Heaven listings (price), checked September and October 2026