Temperature
Celsius, Fahrenheit, Kelvin
Quick reference
About Temperature
A temperature converter switches between Fahrenheit, Celsius, and Kelvin. The maths is easy in principle; in practice the offset (32°F = 0°C, not 0°F = 0°C) trips people up. Most non-US scientific work uses Celsius; engineering and meteorology in the US still use Fahrenheit; physics uses Kelvin because zero is absolute.
Frequently asked questions
Subtract 30, divide by 2 — gives a rough Celsius estimate. Exact formula: (F − 32) × 5/9.
C × 9/5 + 32 = F. Or, less precisely: double Celsius and add 30.
−40 — the only point where both scales read the same number.
Zero Kelvin is absolute zero, where molecular motion stops. Many physics equations only work with absolute temperatures; using Celsius would introduce arbitrary offsets.
Average is closer to 97.5°F (36.4°C). The famous 98.6 was set in 1851 and uses oral measurements from a sample that ran slightly warm.
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Temperature
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