What is the normal body temperature range in Celsius for a healthy adult?

• A. 35.0 to 36.0°C
• B. 33.5 to 35.5°C
• C. 37.5 to 38.5°C
• D. Approximately 36.1 to 37.2°C

Answer: (D)

Normal body temperature in a healthy adult isn’t a single fixed number; it fluctuates within a small range due to factors like time of day, activity, and where the temperature is measured. Core temperature tends to stay around 36.1 to 37.2°C, with modest day-to-day variation. That makes this range the best match for normal across adults and measurement methods. Values lower than this (35.0–36.0°C) would be below normal for most adults, while values higher than this (37.5–38.5°C) are usually considered feverish. So approximately 36.1 to 37.2°C captures the typical normal range.