Convert Fahrenheit to Celsius (2024)

Convert Fahrenheit to Celsius (1)

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Please provide values below to convert Fahrenheit [°F] to Celsius [°C], or vice versa.


Fahrenheit

Definition: The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, 212°F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into 180 equal parts.

History/Origin: The Fahrenheit scale was developed based on a measurement proposed in 1724 by the German physicist Daniel Gabriel Fahrenheit. He initially based the scale on an equal ice-salt mixture, selecting the values of 30°F for the freezing point of water, and 90°F for normal body temperature. He later adjusted the scale such that the melting point of ice was 32°F and body temperature was 96°F. He chose these values to simplify the degree markings he could make on his instruments, since this difference between the temperatures allowed him to mark degree lines by bisecting the interval six times. Later, when using the freezing and boiling points of water as fixed reference points for thermometers became popular, the scale was slightly re-defined such that there would be 180 degrees separating freezing and boiling point, resulting in normal human body temperature being approximately 98°F, rather than Fahrenheit's 96°F.

Current use: Until the 1960's the Fahrenheit scale was the primary scale used in English-speaking countries. Today, most countries around the world use the Celsius temperature scale instead, many having made the change during their metrication processes (conversion to using the metric system of units). However, the Fahrenheit scale is still used as the official temperature scale in a number of countries, including the United States (as well as its unincorporated territories), the Bahamas, Belize, the Cayman Islands, and a few others.

Celsius

Definition: The Celsius (symbol: °C) is an SI (International System of Units) derived unit of temperature. It is defined based on the SI unit of temperature, the kelvin. The Celsius and Kelvin scales are precisely related, with a one-degree change in Celsius being equal to a one degree-change in kelvin. The kelvin (and thus Celsius) is defined based on the Boltzmann constant, k, which equals 1.380649 × 10-23 when expressed in the unit J·K-1, a unit equivalent to kg·m2·s-2·K-1. The kilogram, meter, and second, are defined based on Planck's constant, h, the speed of light, c, and cesium frequency, ΔνCs.

History/origin: From 1743 until 1954, the Celsius scale was based on 0°C for the freezing point of water and 100 °C for the boiling point of water, both at a pressure of one standard atmosphere, using mercury as the working material. This was not always the case, and originally 0°C was defined as the boiling point of water and 100°C was defined as the melting point of snow. Celsius as a unit and a scale was not widely used until this original definition was inverted. In 1954, the unit, "degree Celsius," as well as the Celsius scale were again re-defined to instead be based on absolute zero (-273.15 °C) and the triple point of VSMOW (specially purified water). This is the definition that was used up until 2019, when the kelvin was redefined based on the definitions of the second, meter, and kilogram.

Current use: The Celsius scale replaced the Fahrenheit scale in most countries in the mid to late 20th century. Almost all countries around the world use this scale, except for those in which the metric system has not been adopted, such as the United States. Even in countries like the United States however, Celsius is widely used within the scientific community—it just is not widely used in everyday temperature references.

Fahrenheit to Celsius Conversion Table

Fahrenheit [°F]Celsius [°C]
0.01 °F-17.7722222222 °C
0.1 °F-17.7222222222 °C
1 °F-17.2222222222 °C
2 °F-16.6666666667 °C
3 °F-16.1111111111 °C
5 °F-15 °C
10 °F-12.2222222222 °C
20 °F-6.6666666667 °C
50 °F10 °C
100 °F37.7777777778 °C
1000 °F537.7777777778 °C

How to Convert Fahrenheit to Celsius

C =
5
9
(F - 32)
F =
9
5
C + 32

Example: convert 50 °F to: °C
50 °F = (50 - 32) × 5/9 = 10 °C

Popular Temperature Unit Conversions

Celsius to Fahrenheit

Fahrenheit to Celsius

Celsius to Kelvin

Kelvin to Celsius

Fahrenheit to Kelvin

Kelvin to Fahrenheit


Convert Fahrenheit to Other Temperature Units

Fahrenheit to Kelvin

Fahrenheit to Rankine

Fahrenheit to Reaumur

Fahrenheit to Triple Point Of Water

Convert Fahrenheit to Celsius (2024)

FAQs

How do you convert F to C easily? ›

If you want to convert Fahrenheit to Celsius, do the opposite: subtract 30 from the temperature in degrees Fahrenheit, and then divide by 2 to get the temperature in degrees Celsius. = 27 °C (In reality, 84 °F is equivalent to 28.89 °C—again, that's a pretty close estimate!).

What is the formula for Fahrenheit to Celsius? ›

What is the Formula to Convert Fahrenheit to Celsius? The Fahrenheit to Celsius formula is expressed as °C = (°F - 32) × 5/9; in which the value of F (Fahrenheit) is substituted and we get the value in Celsius. This formula converts the given temperature value from Fahrenheit to Celsius.

What is the equation for converting Celsius to Fahrenheit? ›

To convert Celsius to Fahrenheit, use the formula F = (9/5)C + 32.

How to convert C to F with example? ›

Examples of C o to F o
  1. 0 × 1.8 + 32 = 0 + 32 = 32. 0 degrees Celsius converts into 32 degrees Fahrenheit. ...
  2. 25 × 1.8 + 32 = 45 + 32 = 77. 25 degrees Celsius is equal to 77 degrees Fahrenheit. ...
  3. 150 × 1.8 + 32 = 270 + 32 = 302. 150 degrees Celsius is equal to 302 degrees Fahrenheit.

What is the quick and dirty way to convert Celsius to Fahrenheit? ›

Converting Celsius to Fahrenheit — The Quick and Dirty Way
  1. °C x 9/5 + 32 = °F.
  2. Multiply by 9: 16 x 9 = 144.
  3. Divide by 5: 144/5 = 28.8.
  4. Add 32: 28.8 + 32 = 60.8.
Mar 6, 2015

How do you convert exact Fahrenheit to Celsius? ›

The alternative formula that you will use to convert the Fahrenheit scale into the Celsius scale is: °C = (°F – 32) × 5/9.

How do you convert Celsius to Fahrenheit algorithm? ›

The algorithm to convert from Celsius to Fahrenheit is the temperature in Celsius times 9/5, plus 32.

What is the code for converting Fahrenheit to Celsius? ›

$celsius = (($fahrenheit-32)*5)/9 ; echo("Temperature in celsius is: "); echo($celsius); ?>

How do you convert F to C without a calculator? ›

Fahrenheit to Celsius, subtract 30 then divide by 2. Celsius to Fahrenheit, multiply by 2 then add 30.

How do you convert Celsius to Fahrenheit answer? ›

Celsius to Fahrenheit Conversion Formula

Multiply the °C temperature by 1.8. Add 32 to this number. This is the answer in °F.

How do you convert Celsius to Fahrenheit chart? ›

To convert temperatures in degrees Celsius to Fahrenheit, multiply by 1.8 (or 9/5) and add 32. Here are two handy charts that convert from F to C and also from C to F.

How to change thermometer Celsius to Fahrenheit? ›

Follow These Steps:
  1. Make sure the thermometer is off.
  2. Push and hold the button for 3 seconds.
  3. The symbol will change to Celsius (°C) or Fahrenheit (°F)
  4. To change it again, repeat the steps above.
Apr 19, 2022

What is the trick to go from F to C? ›

Super-easy formula
  1. Fahrenheit to Celsius, subtract 30 then divide by 2.
  2. Celsius to Fahrenheit, multiply by 2 then add 30.
Dec 22, 2022

What is the shortcut conversion F to C? ›

Conversion Shortcut

If you're traveling to Europe, for example, and you know the temperature is 74 °F, you might want to know the approximate temperature in Celsius. Here is a quick tip for making an approximate conversion: Fahrenheit to Celsius: Subtract 30 from the Fahrenheit temperature and then divide by two.

How much is 98.6 in Celsius? ›

For example, a temperature of 37.0°C is the same as 98.6°F (see*).

How do you convert the following temperatures from F to C? ›

Fahrenheit °F to Celsius °C Formula

°C equals °F minus 32, divided by 9/5. Alternatively, since 9/5 = 1.8 we can say °C equals °F minus 32, divided by 1.8.

References

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