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Fahrenheit and celsius temperature conversion
Converting from Fahrenheit to Celsius
From the mid18th to mid20th centuries, Fahrenheit was the system most widely used in Englishspeaking countries, while continental Europeans preferred 'The Swedish Scale'. With the drive to standardisation and metrication from the 1950s, Celsius became the adopted temperature scale for the EEC (later EU), with the UK and Ireland converting (somewhat reluctantly) after joining the European community.
This reluctance was partly due to human preference. For while the Celsius scale was developed for convenience, Fahrenheit's scale was based on observation and measurement. Also, whereas Fahrenheit had developed a ratio scale, Celsius had produced an interval scale. These are very different things, as we shall explain in a future article.
This may help explain why many people prefer Fahrenheit readings as rather closer to actual experience. In Celsius, a chilly day at 11°C does not seem greatly different from a really hot one at 35°C. On the Fahrenheit scale, these respectively measure at about 52°F and 95°F, with the latter traditionally taken as license for red top tabloids to start running 48 point headlines containing words like 'Phew', 'Flaming' and 'Scorcher'.
Incidentally, while the UK's Met Office started publishing temperatures in both Celsius and Fahrenheit from 1962 and dropping use of Fahrenheit altogether from official reports in 1970, British media persisted in using Fahrenheit in weather reports well into the 21st century. Indeed it became the fashion to use Celsius when describing extreme winter conditions and Fahrenheit for heat waves  a nice example of double standards in action.
Fahrenheit and Celsius formula
The formula to convert Fahrenheit to Celsius is:
[°C] = ([°F]  32) × 5/9
In other words, take your Fahrenheit reading, subtract 32, multiply the answer by five and then divide by nine. So 66 degrees Fahrenheit minus 32 would be 34, times five makes 170 divided by nine equals 18.88 recurring, or 18.9°C.
Celsius and Fahrenheit formula
[°F] = [°C] × 9/5 + 32
Here, you multiply your Celsius temperature f to celcius nine, divide by five and then add 32 to find the Fahrenheit reading.
So, 13 degrees Celsius times nine is 117, divided by five is 23.4, plus 32 makes 55.4°F.
Using decimals
To make life a little simpler, using decimals instead of fractions, you can use 1.8 instead of 9/5.
This gives the following modified formulae
 Celsius to Fahrenheit:
(°C + 40) × 1.8  40 = °F  Fahrenheit to Can you get cash back with chime overdraft + 40) / 1.8  40 = °C
Trying this out in action on a hot day (and remembering that multiplying by 1.8 is the same as doubling and then subtracting 10 per cent) we could have 36°C plus 40 is 76, times 1.8 is 136.8 minus 40 is 96.8°F, which is firmly in 'Scorcha' territory.
And the other way, on a rather chillier day, 48°F plus 40 is 88, divided by 1.8 is 48.88 recurring (48.9) minus 40 f to celcius 8.9°C, which actually does sound quite cold.
Fahrenheit to Celsius reference chart
Celsius readings rounded up or down to single decimal points.
Celsius to Fahrenheit reference chart
Fahrenheit readings rounded up or down to nearest whole degree
Conversion units for the Temperature Converter
Celsius or Centigrade, Fahrenheit, Kelvin, Rankine, Reamur,
If you are cooking or baking, take a look at our charts for oven temperature conversions.
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Fahrenheit to Celsius
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In this section, we will learn Fahrenheit to Celsius or °F to °C conversion, with example in detail. Before moving to the conversion, let's understand the definition of Fahrenheit and Celsius.
Fahrenheit
Fahrenheit is the unit to measure the temperature. It is represented by the symbol °F (read as degree Fahrenheit). The German physicist Daniel Gabriel Fahrenheit suggested the Fahrenheit scale. The Fahrenheit uses as an official temperature scale in the United States, the Bahamas, and other countries.
Celsius
Celsius is also a unit to measure the temperature. It is also known as Centigrade. The symbol °C(read as degree Celsius or Centigrade) represents it.
Both Centigrade and Celsius are the naming conventions. There is no difference between Centigrade and Celsius. The Celsius invented by the Andes Celsius. It is also called Centigrade because the scale defined between 0 to 100 degrees. It is widely used in the scientific community. The Celsius scale is used worldwide.
In the following figure, the right scale represents the Fahrenheit scale and the left scale represents the Celsius scale.
Difference between Fahrenheit and Celsius
In the Fahrenheit scale, 32°F represents the melting point of the ice, while 212°F represents the boiling point of water. The absolute zero in the Fahrenheit scale is 459.67°C.
In the Celsius scale, 0°C represents the melting point of the ice, while 100°C represents the boiling point of water. The absolute zero in the Celsius scale is 273.15°C.
Fahrenheit to Celsius Conversion Formula
 Subtract 32 from the given Fahrenheit temperature.
 Multiply the resultant by 5/9 or divide the resultant by 8.
We can write the above steps in the formula terms as follows:
T°C = (T°F  32) * 5/9
OR
T°C = (T°F  32) / (9/5)
OR
T°C = (T°F  32) / f to celcius
Where T is the temperature that we want to convert.
We can also write the above formula as follows:
°C = (°F  32) * (5/9)
OR
°C = (°F  32) / 1.8
Instead of °F, put the temperature which we want to convert.
The following table describes the typical temperature in Fahrenheit and Celsius.
Let's see how to convert Fahrenheit to Celsius using the above formula.
Example 1: Convert 76°F to degree Celsius.
Solution:
The temperature 76°F is equal to 24.4444°C.
Example 2: Convert the room temperature into Celsius.
Solution:
We know that the room temperature in Fahrenheit is 70°F.
The room temperature 70°F is equal to 21°C.
Example 3: Convert the body temperature (Fahrenheit) into Celsius.
Solution:
We know that the body temperature in Fahrenheit is 98.6°F.
The body temperature 98.6°F is equal to 37°C.
Example 4: Convert 16degree Fahrenheit into Celsius.
Solution:
16 °F is equal to 8.88°C.
Example 5: If the temperature of a city is 39°F, what will be the temperature of the city in Celsius?
Solution:
The temperature of the city in Celsius f to celcius 3.89.
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In every science class, you must know how to use and interpret the Celsius temperature scale. But this can be difficult for students who are used to using Fahrenheit instead. How do you convert Celsius to Fahrenheit? What about Fahrenheit to Celsius?
We answer these questions below, giving you the mathematical formulas for converting between these two temperature units, a handy conversion chart, and a quick conversion trick you can use without having to grab a calculator.
Celsius vs Fahrenheit: Key Differences
Before we explain how to convert Celsius to Fahrenheit (and Fahrenheit to Celsius), let’s review the main differences between the two temperature scales.
Celsius (written as °C and also called Centigrade) is the most common temperature scale in the world, used by all but five countries. It’s part of the International System of Units (SI), or what you might know as the metric system, which is typically used in science classes (think centimeters, meters, kilograms, milliliters, etc.) and in science as a whole.
By contrast, Fahrenheit (written as °F) is only used officially by five countries in the world:
 United States
 Belize
 Cayman Islands
 Palau
 Bahamas
Fahrenheit is not part of the metric system; rather, it’s part of the Imperial system, which includes forms of measurements such as inches, feet, pounds, gallons, etc. Moreover, unlike Celsius, it is not typically used in science.
Celsius to Fahrenheit Formula
Unfortunately, converting from Celsius to Fahrenheit isn’t easy to do quickly or in your head. Here are the formulas used to convert Celsius to Fahrenheit and Fahrenheit to Celsius. These formulas will give you the exact conversion from one unit of temperature to the other:
Celsius to Fahrenheit Formula: (°C * 1.8) + 32 = °F
Fahrenheit to Celsius Formula: (°F  32) / 1.8 = °C
For example, say the temperature outside is 18 °C and you want to know what this would equal in Fahrenheit. Here’s how your equation would look once you plug in 18 for °C:
(18 * 1.8) + 32
(32.4) + 32
=64.4 °F
Here’s another example if you want to convert Fahrenheit to Celsius: say you’re feeling ill and your body temperature is 101.3 °F. To find out what this equals in Celsius, simply plug 101.3 into the °F part in the second equation written above:
(101.3  32) / 1.8
(69.3) / 1.8
=38.5 °C
As you can see, these conversions aren’t particularly hard to carry out, but they do take some time and aren’t the easiest to do without a calculator on hand.
Luckily, there’s a shortcut. By memorizing some of the most common temperatures that come up in daily life, you should have no problem being able to convert from Celsius to Fahrenheit and vice versa. We’ll take a look at how to do this next.
It's gettin' hot in here.
Celsius to Fahrenheit Conversion Chart
Below is a conversion chart listing some of the most commonly used temperatures in everyday life when converting from Celsius to Fahrenheit. Memorize these and you’re sure to have an easier time converting from Celsius to Fahrenheit (and f to celcius versa) fast.
Note: I’ve bolded all temperatures that don’t apply to weather but are still important to know, especially for science class.
 Temperature in Celsius (°C)  Temperature in Fahrenheit (°F) 
Boiling Point of Water  100  212 
Extremely Hot Day  40  104 
Body Temperature  37  98.6 
Hot Day  30  86 
Room Temperature  20  68 
Chilly Day  10  50 
Freezing Point of Water  0  32 
Very Cold Day  10  14 
Extremely Cold Day  20  4 
Parity*  40  40 
Source: NIST.gov
*The point at which the two temperature units are equivalent (40 °C = 40 °F).
As you can see from this chart, Fahrenheit temperatures are typically a lot higher than their equivalent Celsius temperatures are.
Also, notice how the difference between Celsius and Fahrenheit starts to get smaller the lower you go in temperature—until, that is, they're the exact same! As the chart indicates, 40 °C is the same temperature as 40 °F.This point is called parity, meaning the two scales use the same value to represent the same temperature. Unfortunately (or fortunately, since this is pretty cold!), you likely won’t come across this temperature in your daily life.
Note that parity only happens at 40°. The lower you go after parity (i.e., the further you go into the negatives), the bigger the difference f to celcius to become again between Celsius and Fahrenheit.
How to Convert Celsius to Fahrenheit: Quick Trick
If you find yourself needing to quickly convert Celsius to Fahrenheit, here is a simple trick you can use: multiply the temperature in degrees Celsius by 2, and then add 30 to get the (estimated) temperature in degrees Fahrenheit. This rule of thumb is really useful and also pretty accurate for most weatherrelated temperatures.
For example, if the temperature outside is 15 °C, this would come out to around 60 °F:
(15 * 2) + 30
(30) + 30
=60 °F (In reality, 15 °C is equivalent to 59 f to celcius pretty close!)
Of course, expect the actual temperature to be a few degrees off, but for the most part, this is a reliable and easy way to convert temperatures in your head fast.
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.
For example, if the temperature outside is 84 °F, this would be roughly equal to 27 °C:
(84  30) / 2
54 / 2
= 27 °C (In reality, 84 °F is equivalent to 28.89 °C—again, that’s a pretty close estimate!).
What’s Next?
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With Celsius, derived from the SI system of units, being the defacto international standard for temperature measurement it is useful for those who have grown up with f to celcius Fahrenheit scale to have a quick and easy converter to change between the two.
To use our converter just type into the Fahreneheit box to get the equivalent temperature in Celsius or the Celsius box to get the equivalent temperature in Fahreneheit. Alternatively use the Kelvin converter for scientific and absolute temperature conversions and our Rankine converter for alternative fahrenheit scale based absolute temperatures.
Conversion Formulae
The conversion formulae for Celsius (degrees C) to Fahrenheit (degrees F) and Fahrenheit to Celsius conversions are as follows:
 °C f to celcius (°F  32) x 5/9
 °F = (°C x 9/5) + 32
Temperature Scales
This site covers the Celsius, Fahrenheit, Kelvin and Rankine temperature scales, click here for more information.
Quick Lookup Fahrenheit to Celsius Common Conversions
The following table gives results for temperature conversions between frozen arctic and equatorial desert environments from Fahrenheit (°F) to Celsius (°C).




Quick Lookup Celsius to Fahrenheit Common Conversions
The table below gives values for termperature conversions between Celsius (degrees C) and Farhenheit (degrees F) for a range of temperatures that will take you from the bitter arctic cold to searing desert heat (Please consult our full conversion tables for oven temperatures and other extremes).




Full Conversion Tables
External Resources
For more information see: