Temperature Converter
Select the temperature unit, enter the value and instantly get the result in all three units.
Celsius
Fahrenheit
Kelvin
Temperature Scales
Temperature is measured using three main scales, each with its own purpose:
| Scale | Zero point | Usage |
|---|---|---|
| Celsius (°C) | Freezing point of water (0 °C) | Everyday use, weather, cooking — Europe and most of the world |
| Fahrenheit (°F) | Freezing point of brine (~−18 °C) | Everyday use, weather — USA, Cayman Islands |
| Kelvin (K) | Absolute zero (−273.15 °C) | Science, physics, chemistry |
Conversion Formulas
Celsius → Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit → Celsius: °C = (°F − 32) × 5/9
Celsius → Kelvin: K = °C + 273.15
Kelvin → Celsius: °C = K − 273.15
Key Reference Temperatures
| Situation | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute zero | −273.15 °C | −459.67 °F | 0 K |
| Freezing point of water | 0 °C | 32 °F | 273.15 K |
| Body temperature | 37 °C | 98.6 °F | 310.15 K |
| Boiling point of water | 100 °C | 212 °F | 373.15 K |
| Oven temperature (baking) | 200 °C | 392 °F | 473.15 K |
Where Do Celsius and Fahrenheit Meet?
Celsius and Fahrenheit are equal at exactly −40° (the same value on both scales).
A handy rule of thumb for Fahrenheit → Celsius estimation: subtract 30 and divide by 2. Example: 70 °F → (70−30)/2 = 20 °C (exact: 21.1 °C). Good enough for everyday use!
Why Does Kelvin Have No Degree Symbol?
Kelvin is not a "scale" in the same sense as Celsius or Fahrenheit — it is the SI base unit of temperature. That's why you write "300 K", not "300 °K". Kelvin starts at absolute zero, the coldest temperature physically possible.
Sources
- BIPM (Bureau International des Poids et Mesures): SI Unit System
- NIST: Temperature Conversion