Convert between Celsius, Fahrenheit, Kelvin and Rankine — instantly and in both directions.
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How This Works
Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Kelvin: K = °C + 273.15. Kelvin is the absolute temperature scale — 0K is absolute zero, the coldest theoretically possible temperature. Rankine is the absolute scale in Fahrenheit units, used in some US engineering applications.
Fahrenheit was adopted widely before the metric system was standardised. The US remains one of very few countries still using imperial units for everyday measurements. Within science and engineering, the US uses Celsius and Kelvin universally. One argument for Fahrenheit is that 0°F and 100°F roughly bracket the range of outdoor temperatures humans typically experience in inhabited regions — though this is coincidental.