Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin. Enter a temperature in any scale to see all three values at once.
What Is the Temperature Converter?
A temperature converter converts a temperature value between the three most commonly used temperature scales: Celsius (°C), Fahrenheit (°F) and Kelvin (K). Celsius is used in most of the world for everyday temperatures. Fahrenheit is used primarily in the United States. Kelvin is the SI base unit of temperature used in science and engineering.
How to Use the Temperature Converter
- Enter the temperature value.
- Select the scale you are converting from.
- Click Convert to see the equivalent in all three scales.
Formula
Worked Example
100°C = 212°F = 373.15 K (boiling point of water at sea level)
0°C = 32°F = 273.15 K (freezing point of water)
−40°C = −40°F (the point where both scales are equal)
Understanding Your Result
Kelvin is an absolute temperature scale — 0 K is absolute zero, the coldest possible temperature. Celsius and Fahrenheit are relative scales with different zero points. The Celsius and Fahrenheit scales cross at −40°, which is a useful reference point.
Common Mistakes
- Forgetting to add 32 when converting Celsius to Fahrenheit.
- Using negative Kelvin values — Kelvin cannot be below 0 (absolute zero).
Frequently Asked Questions
What is absolute zero?
Absolute zero is 0 K = −273.15°C = −459.67°F. It is the theoretical lowest possible temperature, at which all thermal motion ceases.
At what temperature are Celsius and Fahrenheit equal?
At −40°. Both scales give the same reading: −40°C = −40°F.
What is normal body temperature in Fahrenheit?
Normal human body temperature is approximately 37°C = 98.6°F.