Estimate what one sauna session does to your body.

Use simple session details to estimate sweat loss, heart-work, heat exposure, recovery support, relaxation support and the body’s likely heat response. No intrusive health questions required.

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Your sauna session

Changes the estimated heat load and sweat response.

Typical traditional sauna range: 70–100°C.

How long you stay in before taking a break.

Example: 3 rounds of 15 minutes.

Your usage

Changes weekly exposure, yearly exposure and adaptation estimate.

Only used to estimate fluid loss as bodyweight percentage.

Changes estimated sweat and fluid replacement.

Changes heat strain and adaptation score.

Contrast therapy

Typical cold plunge range: 3–15°C.

Short dips are enough. More is not always better.

Usually one dip between sauna rounds.

Finishing cold increases alertness. Finishing warm usually feels calmer.

Frequently Asked Questions

It estimates sweat loss in litres, a heart-rate range, cardio-equivalent minutes, and scores for recovery, relaxation and heat adaptation. An estimate for planning, not medical advice.

Around 45 minutes of heat at an average sweat rate loses roughly half a litre, and it suggests drinking back a quarter more than you lost, so about 650ml.

Infrared runs cooler and puts less heat load on the body, so it scores lower here. That is a gentler session rather than a worse one, and it suits anyone who finds 85 degrees hard.

It lifts the alertness and circulation scores noticeably. Finishing warm scores better for relaxation and finishing cold better for feeling switched on, which matters in the evening.

Sauna does not suit everyone, particularly with pregnancy, heart conditions, low blood pressure, heat intolerance or after alcohol. Check with your doctor before building a routine.

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