Instant, bidirectional temperature conversion between Celsius and Fahrenheit: with Kelvin output, the formula explained, a context description of what the temperature feels like, and a quick-reference table for common temperatures.
Type a temperature to convert
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Quick reference for the temperatures you encounter most often. Highlighted rows appear when your input is close to a reference point.
| Reference Point | Celsius | Fahrenheit | Kelvin |
|---|
Example: 100°C = (100 × 9/5) + 32 = 180 + 32 = 212°F
Example: 98.6°F = (98.6 − 32) × 5/9 = 66.6 × 0.5556 = 37°C
Kelvin is the SI base unit of temperature. 0 K (absolute zero) is the theoretical point at which all molecular motion stops: −273.15°C or −459.67°F.
The Celsius scale (°C) was proposed by Swedish astronomer Anders Celsius in 1742. He originally set 100 as the freezing point and 0 as the boiling point: the scale was later inverted to its current form by Carolus Linnaeus. Celsius is the standard temperature scale used in science, medicine and everyday life in most of the world.
The Fahrenheit scale (°F) was developed by Polish-German physicist Daniel Gabriel Fahrenheit in 1724. He set 32°F as the freezing point of water and 212°F as its boiling point at standard atmospheric pressure. Fahrenheit is still in common everyday use in the United States, the Bahamas, the Cayman Islands and a few other territories.