Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly — all three update simultaneously. Includes clinical body temperature reference chart with fever thresholds, hypothermia guide, and one-click presets.

3-way simultaneous Clinical reference chart Fever/hypothermia flags

Celsius

°C

°F = (°C × 9/5) + 32

Fahrenheit

°F

°C = (°F − 32) × 5/9

Kelvin

K = °C + 273.15

🩺 Clinical Body Temperature Reference — click any row to load

Status°C°FNotes

Hypothermia ≤ 35°C ≤ 95°F Medical emergency — warm immediately

Low Normal 36.0°C 96.8°F Low end of normal range

Normal 37.0°C 98.6°F Classic "normal" body temperature

High Normal 37.5°C 99.5°F Upper limit of normal

Low Fever 38.0°C 100.4°F WHO/standard fever threshold

Moderate Fever 38.5°C 101.3°F Consider antipyretics

High Fever 39.5°C 103.1°F Active management required

Hyperpyrexia ≥ 41°C ≥ 105.8°F Life-threatening — emergency care

Temperature Conversion Formulas

Convert	Formula	Example
°C → °F	°F = (°C × 9/5) + 32	37°C = (37 × 1.8) + 32 = 98.6°F
°F → °C	°C = (°F − 32) × 5/9	98.6°F = (98.6 − 32) × 0.5556 = 37°C
°C → K	K = °C + 273.15	37°C = 310.15 K
K → °C	°C = K − 273.15	310.15 K = 37°C
°F → K	K = (°F + 459.67) × 5/9	98.6°F = 310.15 K

Clinical Temperature Thresholds

Fever is defined as a core body temperature ≥38.0°C (100.4°F) by WHO and most international guidelines. In clinical practice, the measurement site affects readings: rectal temperature runs ~0.5°C higher than oral, which runs ~0.5°C higher than axillary. Tympanic temperatures are convenient but less accurate. Normal body temperature varies between individuals and throughout the day (lowest in early morning, highest in late afternoon).

Note: The long-held "37°C = 98.6°F" as a universal normal has been challenged by recent research showing mean oral temperature in adults is closer to 36.6°C (97.9°F) and declines slightly with age.