Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin quickly and accurately.
Enter a temperature and instantly see the equivalent value in all three temperature scales.
Convert Temperature
Enter a temperature and select the unit you want to convert.
Temperature Conversion Results
Temperature Conversion Summary
Input Temperature
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Celsius
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Fahrenheit
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Kelvin
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Temperature Scales
Celsius, Fahrenheit and Kelvin are three commonly encountered temperature scales. Celsius is widely used for everyday temperature measurements, Fahrenheit is commonly used in the United States, and Kelvin is widely used in scientific work.
| Scale | Symbol | Common Reference |
|---|---|---|
| Celsius | °C | Water freezes at 0°C |
| Fahrenheit | °F | Water freezes at 32°F |
| Kelvin | K | Absolute temperature scale |
Temperature Conversion Formulas
Temperature scales use different zero points and intervals, so converting temperatures requires formulas rather than simply multiplying by a constant.
Fahrenheit = (Celsius × 9/5) + 32
Celsius = (Fahrenheit − 32) × 5/9
Kelvin = Celsius + 273.15
Celsius = Kelvin − 273.15
Temperature Conversion Example
Suppose the temperature is 25°C.
25°C = 77°F
25°C = 298.15 K
The Fahrenheit value is calculated as (25 × 9/5) + 32 = 77°F.
Common Temperature References
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute zero | −273.15°C | −459.67°F | 0 K |
| Water freezing point | 0°C | 32°F | 273.15 K |
| Room temperature example | 20°C | 68°F | 293.15 K |
| Water boiling point | 100°C | 212°F | 373.15 K |
Water freezing and boiling points shown here assume standard atmospheric pressure.
Where Temperature Conversion Is Useful
Temperature conversion is useful when reading weather reports, cooking instructions, scientific measurements, equipment specifications and information from countries that use different temperature scales.
| Situation | Common Temperature Scale |
|---|---|
| Weather reports | Celsius or Fahrenheit |
| Cooking | Celsius or Fahrenheit |
| Scientific calculations | Kelvin |
| Laboratory measurements | Kelvin or Celsius |
| International specifications | Celsius, Kelvin or Fahrenheit |
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 and then add 32. For example, 25°C equals 77°F.
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature and multiply the result by 5/9.
How do you convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature. For example, 25°C equals 298.15 K.
Is Kelvin the same as Celsius?
No. The Celsius and Kelvin scales have the same size temperature interval, but their zero points are different. A temperature of 0°C equals 273.15 K.
What is absolute zero?
Absolute zero is 0 K, which corresponds to −273.15°C or −459.67°F.
What temperature is 100°C in Fahrenheit?
100°C equals 212°F.