Fahrenheit to celsius conversion
Information about the Fahrenheit and Celsius temperature scales and conversion between these two units of measurement.
Type in either field in the form below to convert from Fahrenheit to Celsius or from Celsius to Fahrenheit:
Fahrenheit is a temperature scale used for describing temperatures in Fahrenheit degrees (°F).
It is most commonly used in the United States in weather forecasts and to describe temperatures inside houses, offices, etc.
Celsius, or centigrade, is also a temperature scale that describes temperatures in Celsius degrees (°C) and it is used in (almost) everywhere else outside the US.
![Worldwide usage of Fahrenheit and Celsius](images/worldmap.jpg)
The Fahrenheit and Celsius scales coincide at -40°.
Read more about the fahrenheit scale and celsius.
Remember a few popular temperatures
Because of the complex convesion formula people often use fahrenheit to celsius calculators to convert temperatures. However, remembering a few °C and °F pairs can be useful in everyday life.
→ 0°C is the freezing point of water. It is 32°F
→ 1 Celsius change is a change of 1.8 Fahrenheits while a 1 Fahrenheit change translates to a change of 0.55 Celsius. This is one of the easiest way to convert them if you know that 0°C = 32°F
→ 100°F is really really hot in the summer and it is 38°C so when people talk about a 100°F heatwave, it means hot.
→ Your thermostat in the winter is ideally set to about 69°F or 20°C. This saves on your heating bill and also helps reduce the use of natural gas, which is the most common natural resource used to heat houses.
→ 37 degrees Celsius is the equivalent of 98.6 degrees Fahrenheit, or normal body temperature. A fever in Celsius is a temperature greater than 38 degrees, or the equivalent of 100.4 degrees Fahrenheit. Also, a temperature of 39 degrees Celsius/102 degrees Fahrenheit is not dangerous in and of itself, although it should prompt the individual to seek medical attention if it persists.
→ Air conditioners should be set to no lower than 77-78°F or 25-26°C.
Find more examples of temperature measurements here.
![Fahrenheit and celsius scale](images/fahrenheit-celsius.jpg)
Conversion formula between fahrenheit and celsius
The conversion formulas between °F and °C are:
°C = (°F - 32) x 5/9
°F = °C x 9/5 + 32
This precice conversion formula between the two temperature scales is hard it is to remember so here's a simpler formula. The result won't be scientifically accurate but it does provide an approximate number that's "good enough" in everyday situations: °F = (°C x 2) + 30
For example: (25C x 2) + 30 = 80F. The accurate answer is 77F but if you don't have a calculator handy and can't multiply and divide using fractions then this formula will give you a good idea that you can use in everyday situations.
Another relatively simple conversion method from C to F is to double the celsius, subtract 10%, add 32. For example: 100C = 2 x 100 - 20 + 32 = 212F