Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly — enter a value and see all conversions at once.
Temperature Conversion Formulas
| From → To | Formula | Example |
|---|
| °C → °F | °F = °C × 9/5 + 32 | 100°C = 212°F |
| °F → °C | °C = (°F − 32) × 5/9 | 72°F = 22.2°C |
| °C → K | K = °C + 273.15 | 0°C = 273.15 K |
| K → °C | °C = K − 273.15 | 373.15 K = 100°C |
Common Reference Points
| Description | °C | °F | K |
|---|
| 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 |
| Body temperature | 37°C | 98.6°F | 310.15 K |
| Water boils | 100°C | 212°F | 373.15 K |
Frequently Asked Questions
- Why does the US use Fahrenheit?
- The US adopted Fahrenheit in the 18th century and did not switch to Celsius during the metric system transition that most countries underwent. Fahrenheit is also used in the Cayman Islands, Belize, and a few other territories.
- What is Kelvin used for?
- Kelvin is the SI base unit of thermodynamic temperature. It is used in science and engineering, particularly in physics, chemistry, and astronomy. Unlike Celsius and Fahrenheit, Kelvin has no degree symbol — it is just "K".