Fahrenheit to Celsius (ºF to ºC)

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ºC =
ºF - 32
 
______
 
 
1.8000
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More information: Fahrenheit
More information: Celsius
Celsius to Fahrenheit (Swap Units) Fahrenheit to Celsius table

To convert from Fahrenheit to Celsius in your head you can subtract 30 from the Fahrenheit figure and halve the result. This is only a rough estimate and only to be used for values typically found in weather temperatures.

Absolute Zero -459.67ºF-273.15ºC
Parity -40ºF -40ºC
Zero 0ºF -17.78ºC
Freezing point 32ºF 0ºC
Body Temperature 98.6ºF 37ºC
Boiling point 212ºF 100ºC

Fahrenheit

Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212°F (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart. Therefore, a degree on the Fahrenheit scale is 1/180 of the interval between the freezing point and the boiling point of water. Absolute zero is defined as -459.67°F.

A temperature difference of 1°F is the equivalent of a temperature difference 0.556°C.

ºC =
ºF - 32
 
______
 
 
1.8000

Celsius

Although initially defined by the freezing point of water (and later the melting point of ice), the Celsius scale is now officially a derived scale, defined in relation to the Kelvin temperature scale.

Zero on the Celsius scale (0 °C) is now defined as the equivalent to 273.15 K, with a temperature difference of 1 deg C equivalent to a difference of 1 K, meaning the unit size in each scale is the same. This means that 100 °C, previously defined as the boiling point of water, is now defined as the equivalent to 373.15 K.

The Celsius scale is an interval system but not a ratio system, meaning it follows a relative scale but not an absolute scale. This can be seen because the temperature interval between 20 °C and 30 °C is the same as between 30 °C and 40 °C, but 40 °C does not have twice the air heat energy of 20 °C.

A temperature difference of 1 deg C is the equivalent of a temperature difference 1.8°F.

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