Temperature Converter
Convert Celsius, Fahrenheit, Kelvin, and Rankine — bidirectional with all units shown simultaneously.
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Frequently Asked Questions
How do I convert Celsius to Fahrenheit?↓
°F = (°C × 9/5) + 32. For example, 100°C × 9/5 = 180, plus 32 = 212°F (boiling point of water at sea level).
How do I convert Fahrenheit to Celsius?↓
°C = (°F − 32) × 5/9. For example, 98.6°F − 32 = 66.6, × 5/9 = 37°C (normal human body temperature).
What is absolute zero in Celsius and Fahrenheit?↓
Absolute zero is 0 Kelvin = −273.15°C = −459.67°F. At absolute zero, all molecular motion theoretically stops. It is the coldest possible temperature.
What is the Rankine scale?↓
The Rankine scale is an absolute temperature scale like Kelvin but based on Fahrenheit degrees. 0°R = absolute zero; water freezes at 491.67°R and boils at 671.67°R. It is used mainly in engineering contexts in the US.