Despite the fact that almost the entire world uses the Celsius scale to measure temperature, there are still countries that use the Fahrenheit scale. A striking example is England and the USA. About 300 years ago it was very useful, but now it is terribly inconvenient, since you have to convert Fahrenheit to Celsius and vice versa. Thus, an error during the transfer from one system to another led to the crash of a NASA probe worth more than $125 million in the atmosphere of Mars. We will show and tell you how to correctly convert degrees from one scale to another, and also provide a table of temperature relationships.

Relationship between Fahrenheit and Celsius temperatures

Fahrenheit Celsius
Boiling point of water 212° 100°
194° 90°
176° 80°
158° 70°
140° 60°
122° 50°
104° 40°
86° 30°
68° 20°
50° 10°
Freezing point of water 32° 0°
14° -10°
0° -17.8°
Absolute zero temperature -459.67° -273.15°

Conversion from Fahrenheit to Celsius: 32 is subtracted from the original figure and multiplied by 5/9.
Conversion from Celsius to Fahrenheit: the original figure is multiplied by 9/5 and 32 is added.

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Initial value

Converted value

kelvin degrees Celsius degrees Fahrenheit degrees Rankine degrees Reaumur Planck temperature

More about temperature

General information

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You've probably noticed more than once in American films that they measure temperature rather strangely. It’s strange for us, since we are used to the fact that we have this indicator in degrees Celsius. At zero, water freezes; at a hundred, it boils. Everything is simple and convenient. But to the typical American this will seem odd. After all, he will claim that water turns into ice at 32 degrees. But only in Fahrenheit. Of course, the temperature in Celsius and Fahrenheit will be very different. Let's figure out how much. Why did this happen and find out how to convert Fahrenheit to Celsius.

Fahrenheit or Celsius?

Throughout the world, it is customary to measure temperature in degrees Celsius (°C). Actually, this system is named after the Swedish scientist who developed a new scale in the 18th century. At first, he took the boiling point of water as zero, and freezing occurred at a hundred degrees. But then either he himself or someone else (it is not known for certain) revised the system and simply turned it upside down.

Since then, this scale has become the most widespread in the world, displacing various analogues. But one still firmly settled. In the US, we still talk about temperature in degrees Fahrenheit (°F). Other English-speaking countries and Europe abandoned this unit of measurement in the last century.

According to Fahrenheit, water boils at 212 degrees and freezes at 32. 100°F corresponds to the temperature of the human body, which is where he started from. True, if you convert one hundred degrees Fahrenheit to Celsius, you get a little more than 37 °C. Probably, at the time of the creation of the system, the scientist was sick with a fever.

Objectively, his system (also named after the scientist) is not very logical compared to Celsius, but it has the right to life.

How to convert Fahrenheit to Celsius?

You are unlikely to ever need this skill, but if you suddenly find yourself in the states or get behind the wheel of a purely American car, then it’s fine. To convert from one system to another, there is a formula for Fahrenheit to Celsius. It can, of course, be applied in the opposite direction.

To make the temperature in °F become °C, you need to subtract 32 from the original number, divide the difference by two and add one tenth to the resulting number.

For example, you came across an American thermometer. You took the temperature and it was 98 degrees Fahrenheit. In Celsius, this value will be as follows: 98 - 32 = 66 / 2 = 33 + 3.3 = 36.3 °C. This calculation is quite accurate, there is, of course, a small error, but for domestic needs this formula is quite acceptable.

How to convert Celsius to Fahrenheit?

Quite simple. We multiply the temperature in Celsius by 1.8 and add 32. For example, 100°C will be equal to 212°F, that is, 100 x 1.8 + 32. In general, some thermometers are produced with both scales on both sides, which instantly solves the issue and a person does not need to think about how to convert Fahrenheit to Celsius.

In addition, there are various online converters and applications for your phone, so there shouldn’t be any problems.

It is worth noting that none of the above temperature measurement scales are absolute. These are household systems, but in science, others are used for various studies, such as the Kelvin scale (K), for example, where zero is considered the lowest possible temperature at which a substance thermal energy it is impossible to extract (0K = −273.15 °C = −459.67 °F).

Temperature is a physical quantity that characterizes the thermodynamic state of an object. Currently, several main methods are used to measure temperature.

Temperature Celsius

In Russia and a number of other countries, including European ones, the most common parameter used to measure temperature is degrees Celsius. It got its name from the author of this temperature scale Alexander Celsius, who put forward his proposal in 1742.

Initially, the idea of ​​Celsius was based on the basic physical states of water: thus, its freezing point was taken as 0 degrees. Thus, temperatures below 0, that is, those at which water is in a solid state, were classified as negative temperatures. The boiling point of water was taken to be 100 degrees: these reference points allowed us to calculate a range of 1 degree Celsius.

Subsequently, the Kelvin scale was developed, taking absolute zero, that is, the minimum physically possible temperature, to be 0 degrees Kelvin (or 0); the Kelvin and Celsius scales were brought into line with each other. Now, in order to set the temperature of a substance in degrees Celsius, you need to add 273.15 to the temperature on the Kelvin scale.

Fahrenheit temperature

The German scientist Gabriel Fahrenheit developed his scale almost simultaneously with Celsius: in 1724. He, like Celsius, took into account the states of water, but designated them with different numbers. So, water on the Fahrenheit scale is 32 degrees, and the boiling point is 212 degrees. Based on this temperature range, the value of one was measured, which is 1/180 of the difference between the freezing and boiling points of water in degrees.

Relation between Celsius and Fahrenheit temperatures

To implement temperature values ​​from the Celsius scale to the Fahrenheit scale and back, there are special formulas: for example, Celsius temperature = (Fahrenheit temperature - 32) * 5/9. For example, 120 degrees Fahrenheit according to this formula would be equal to 48.9 degrees Celsius.

To convert back, you can use the following formula: Fahrenheit temperature = Celsius temperature * 9/5 + 32. For example, 20 degrees Celsius according to this formula will correspond to 68 degrees Fahrenheit. Moreover, both of these formulas can also be used to convert negative Celsius temperatures to the Fahrenheit scale.