Not meaningfully. A session burns a modest number of calories and you will weigh less immediately afterwards, but almost all of that is water you replace by drinking. It is not a weight-loss treatment and we will not sell it as one.
Where the claim comes from
Infrared sauna marketing often quotes figures of 400 to 600 calories burned in a session. Those numbers come from small studies with particular protocols, and they are repeated far beyond what the evidence supports. Your heart rate does rise in the heat, and that does cost energy — but the realistic figure is closer to what a gentle walk of the same length would burn.
Infrared Sauna is one of five treatments at Floatwell Cambridge, 500 m from the station — about infrared sauna →
The scales after a session
You will be lighter. In a 30-minute session most people lose several hundred grams to a kilogram, and all of it is sweat. Drink a glass of water and it comes back. Weighing yourself after a sauna measures how much you sweated, not how much fat you lost.
Repeated sessions used deliberately to make weight — common in combat sports — are a different practice with real risks attached, and not something we encourage or support.
What it is genuinely useful for
- Loosening stiff muscles and easing post-training soreness
- Raising circulation
- Thirty minutes of enforced rest, which matters more than it sounds
- Making the next training session more likely to happen
That last one is the only honest connection to weight. People who recover well train more consistently, and consistency is what changes body composition. The sauna is a small part of that chain, not a shortcut past it.
Why we put it this way
Being told a sauna will burn 600 calories sets you up to be disappointed and to misjudge what you eat around it. We would rather you booked knowing what it does.
Drink more than you think
Whatever you are using it for, rehydrate properly afterwards — before the session as well as after. If you feel lightheaded, come out. There is no benefit in pushing through.