🌡️ Unit Converter
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Reaumur — all results shown at once.
Common Temperature Reference Points
| Point | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15 °C | -459.67 °F | 0 K |
| Water Freezes | 0 °C | 32 °F | 273.15 K |
| Room Temperature | 20 °C | 68 °F | 293.15 K |
| Human Body | 37 °C | 98.6 °F | 310.15 K |
| Water Boils | 100 °C | 212 °F | 373.15 K |
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8) and then add 32. Formula: F = (C x 9/5) + 32. For example, 100 degrees Celsius equals 212 degrees Fahrenheit.
What is the difference between Celsius and Fahrenheit?
Celsius sets the freezing point of water at 0 and the boiling point at 100. Fahrenheit sets freezing at 32 and boiling at 212. Celsius is used worldwide, while Fahrenheit is primarily used in the United States.
What is absolute zero in Kelvin?
Absolute zero is 0 Kelvin, which equals -273.15 degrees Celsius or -459.67 degrees Fahrenheit. It is the theoretical lowest possible temperature where all molecular motion ceases.
At what temperature are Celsius and Fahrenheit the same?
Celsius and Fahrenheit are equal at -40 degrees. This is the single temperature where both scales show the same numerical value: -40 degrees C equals -40 degrees F.
What is the Rankine temperature scale?
The Rankine scale is an absolute temperature scale where zero Rankine equals absolute zero, similar to Kelvin. However, one Rankine degree equals one Fahrenheit degree rather than one Celsius degree. It is primarily used in engineering systems in the United States.