Temperature Converter — Convert Celsius, Fahrenheit, Kelvin & Rankine
Use this free temperature converter to instantly convert between Celsius, Fahrenheit, Kelvin and Rankine. Type a temperature into any field and all other units update immediately. Includes common reference points for weather, cooking, body temperature and science.
Temperature Converter
Type in any field to convert all units instantly
🌡️ Common Reference Points
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Celsius vs Fahrenheit
Celsius is the standard temperature scale used in most of the world for everyday weather, cooking and science. Fahrenheit is used primarily in the United States. Water freezes at 0°C (32°F) and boils at 100°C (212°F).
What Is Kelvin?
Kelvin is the scientific temperature scale used in physics and chemistry. Unlike Celsius and Fahrenheit it has no negative values — it starts at absolute zero (0K = −273.15°C), the theoretical coldest possible temperature. To convert Celsius to Kelvin add 273.15.
Temperature Conversion Formulas
Celsius to Fahrenheit: (°C × 9/5) + 32. Fahrenheit to Celsius: (°F − 32) × 5/9. Celsius to Kelvin: °C + 273.15. Kelvin to Celsius: K − 273.15.
FAQs
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 then add 32. For example 20°C × 1.8 + 32 = 68°F. Or type 20 into the Celsius field above.
What is absolute zero?
Absolute zero is the lowest possible temperature — 0 Kelvin, −273.15°C or −459.67°F. At this temperature all molecular motion stops.
What is normal body temperature in Fahrenheit?
Normal body temperature is 37°C which equals 98.6°F.
Is this calculator free?
Yes completely free with no sign-up needed.