Sauna Core-Temperature Simulator

Multi-node thermoregulation model (Stolwijk 25-node + Tanabe control) · nude, seated · not medical advice

Your Body

Body weight (kg)

Height (cm)

Body fat %

Sex

Heat acclimatization

Sauna Conditions

Air temp (°C)

Session length (min)

Humidity — water-vapor pressure (kPa) absolute

Dry

Humid

Löyly

Air velocity (m/s) still ≈ 0.1

Facing a hot stove / stones (adds radiant load)

Safety note: This is a physics illustration, not a medical device. Its heat-transfer coefficients are extrapolated well beyond their lab-validated range (~10–40 °C). Never use it to justify a long or hot session. Sauna is contraindicated with unstable heart disease, and alcohol before/during sharply raises risk. If you feel dizzy or unwell, get out.

Results

—

peak core °C

—

core temp rise

—

time to 38.5°C

—

fluid lost (L)

37°38.5° caution40°+ danger

Run a simulation to see the core-temperature trajectory.

Core & Skin Temperature

°C

°F

Heat flux