What Is the Sauna Calories Burned Calculator?
Sitting in a sauna gently raises your heart rate and metabolic activity, so you do burn a modest number of extra calories. This calculator estimates that energy expenditure using the widely-used MET (Metabolic Equivalent of Task) method. A passive sauna session is generally rated at about 1.5 MET — slightly above resting (1.0 MET) but far below light exercise. The tool is a global, unit-based estimate and does not depend on any country or region.
How to Use It
Enter your body weight in kilograms, how many minutes you stayed in the sauna, and an intensity value in MET. Leave MET at the default 1.5 for typical sauna sitting; you can nudge it slightly higher if you feel your heart working harder. Press calculate to see the total calories burned plus the per-minute rate.
The Formula Explained
The calculation is $$\text{Calories} = \frac{\text{MET} \times 3.5 \times \text{weight(kg)}}{200} \times \text{minutes}$$. The constant 3.5 is the baseline oxygen uptake in millilitres per kilogram per minute, and dividing by 200 converts oxygen consumption into kilocalories. Multiplying by MET scales the effort and by minutes gives the session total.
Worked Example
A 70 kg person sits in the sauna for 20 minutes at 1.5 MET: \(1.5 \times 3.5 \times 70 \div 200 = 1.8375\) kcal per minute. Over 20 minutes that is \(1.8375 \times 20 \approx\) 36.75 kcal.
FAQ
Does sweating in a sauna burn lots of calories? No. Most weight lost in a sauna is water that returns once you rehydrate. The true calorie burn is small.
What MET should I use? Around 1.5 for passive sitting. Values above 2 are unrealistic for a sauna and overstate the burn.
Is this medically accurate? It is an estimate. Individual metabolism, sauna temperature and hydration all affect the real figure, so treat the result as a rough guide.
