🌡️ Body Temperature Converter
Convert body temperature between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Includes normal body temperature reference (37 °C / 98.6 °F) and a fever indicator.
What Is Body Temperature?
Body temperature is a measure of the body's ability to generate and release heat. It is a vital sign that indicates overall health and can help detect illness, infection, or other medical conditions.
The normal human body temperature is typically around 37 °C (98.6 °F), but this can vary depending on:
- Time of day: Temperature is lowest in the morning and highest in the late afternoon.
- Age: Older adults tend to have lower body temperatures.
- Activity level: Exercise can temporarily raise body temperature.
- Measurement method: Rectal, oral, axillary, and ear temperatures vary slightly.
A fever is generally defined as a body temperature of 38 °C (100.4 °F) or higher. This converter helps you quickly convert temperatures between Celsius, Fahrenheit, and Kelvin.
How to Convert Body Temperature
The conversion formulas are:
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F − 32) × 5/9
Celsius to Kelvin: K = °C + 273.15
Kelvin to Celsius: °C = K − 273.15
For example, to convert 37 °C (normal body temperature) to Fahrenheit:
°F = (37 × 9/5) + 32
°F = 66.6 + 32
°F = 98.6 °F
Why Use This Converter?
- Instant results: Convert body temperature between all three scales in real-time.
- Fever indicator: See if the temperature falls into normal, elevated, or fever ranges.
- Step-by-step breakdown: Understand exactly how the conversion is calculated.
- Free & private: No registration, no data storage — all calculations are done in your browser.
❓ Body Temperature Converter FAQ
What is the normal human body temperature?
The average normal body temperature is 37 °C (98.6 °F). However, a normal range of 36.5 – 37.5 °C (97.7 – 99.5 °F) is considered healthy.
What is considered a fever?
A fever is typically defined as a body temperature of 38 °C (100.4 °F) or higher. Temperatures between 37.6 – 38.0 °C are considered elevated.
How do I convert Celsius to Fahrenheit?
The formula is °F = (°C × 9/5) + 32. For example, 37 °C × 9/5 + 32 = 98.6 °F.
How do I convert Fahrenheit to Celsius?
The formula is °C = (°F − 32) × 5/9. For example, (98.6 − 32) × 5/9 = 37 °C.
What is the Kelvin scale?
The Kelvin scale is an absolute temperature scale used in science. 0 K is absolute zero (−273.15 °C). Normal body temperature is approximately 310.15 K.
Why does body temperature vary?
Body temperature varies due to time of day, age, physical activity, menstrual cycle, and measurement method. It is also influenced by illness, stress, and environmental factors.
What is the best way to measure body temperature?
Common methods include oral, rectal, axillary (armpit), ear (tympanic), and forehead (temporal) measurements. Rectal measurements are the most accurate.
How accurate is this converter?
This converter provides highly accurate results using the standard conversion formulas. You can adjust the decimal precision to suit your needs.
Is this converter free?
Yes, this converter is completely free to use. No registration or personal data storage is required.
When should I see a doctor about a fever?
Seek medical attention if you have a fever of 39.5 °C (103 °F) or higher, if the fever lasts more than 3 days, or if it is accompanied by severe symptoms like difficulty breathing, confusion, or severe headache.