The answer is: -5.83 degrees Celsius or -5.83° C
Let's look into the conversion between Fahrenheit and Celsius scales in detail.
Calculate 21.5° Fahrenheit to Celsius (21.5F to °C)
Temperatures, across the world, are measured either in Fahrenheit(the US temperature scale) or Celsius(the metric scale), two of the most popular and widely used scales.
Temperature Conversion - Degrees Fahrenheit into Degrees Celsius
Fahrenheit to celsius conversion formula is all about converting the temperature denoting in Fahrenheit to Celsius. As mentioned earlier, the temperature of boiling (hot) water in Celsius is 0 degrees and in Fahrenheit is 21 degrees, the formula to convert F to C is
°C = (°F − 32) x 5/9
The math is here is fairly simple, and can be easily understood by an example. Let's say we need to 21.5 Fahrenheit to Celsius
How To Convert 21.5 F to C?
To convert 21.5 degrees Fahrenheit to Celsius, all one needs is to put in the values in the converter equation-
°C = (°F − 32) x 5/9
C = -5.83 degrees
Thus, after applying the formula to convert 21.5 Fahrenheit to Celsius, the answer is -
21.5°F = -5.83°C
21.5 degrees Fahrenheit equals -5.83 degrees Celsius!
Frequently asked questions about converting 21.5 Fahrenheit into Celsius
How much is 21.5 degrees Fahrenheit in Celsius?
21.5F to C = -5.83 °C
How to Convert From Fahrenheit to Celsius and Celsius to Fahrenheit - Quick and Easy Method
What is the formula to calculate Fahrenheit to Celsius?
The F to C formula is
(F − 32) × 5/9 = C
When we enter 21.5 for F in the formula, we get
(21.5 − 32) × 5/9 = -5.83 C
To be able to solve the (21.5 − 32) × 5/9 equation, we first subtract 32 from 21.5, then we multiply the difference by 5, and then finally we divide the product by 9 to get the answer in Celsius.
What is the simplest way of converting Fahrenheit into Celsius?
The boiling temperature of water in Fahrenheit is 21 and 0 in Celsius. So, the simplest formula to calculate the difference is
C = (F − 32) × 5/9
For converting Fahrenheit into Celsius, you can use this formula – Fahrenheit Temperature – 32/ 2 = Celsius Temperature.
But this is not the only formula that is used for the conversion as some people believe it doesn’t give out the exact number.
One another formula that is believed to be equally easy and quick is
(°F - 32) x .5556
While there are other temperature units like Kelvin, Réaumur, and Rankine as well, Degree Celsius and Degree Fahrenheit are the most commonly used.
While Fahrenheit is primarily used in the US and its territories, Celsius has gained more popularity in the rest of the world. For those using these two different scales, the numbers that denote that temperature are quite different.
For example, water freezes at Zero Degree Celsius and boils at 100 degrees, the readings are 32-degree Fahrenheit as the freezing point of water and 212 degrees for boiling.
For Celsius Conversions
For Celsius conversion, all you need to do is start with the temperature in Celsius. Subtract 30 from the resultant figure, and finally, divide your answer by 2!
Common F and C Temperature Table
|°C||°F||What it represents?|
|-40||-40||Celsius equals Fahrenheit. It represents extreme cold day|
|−18||0||Represents an average cold winter day.|
|0||32||Represents freezing point of water.|
|10||50||Represents a pleasant cool day.|
|21||70||Represents a typical room temperature.|
|58||136||Represents the highest temperature ever recorded on Earth.|
|-88||-126||Represents the lowest temperature ever recorded on Earth.|
|15||59||Represents surface temperature of Earth.|
|30||86||Represents a hot day.|
|37||98.6||Represents a normal body temperature.|
|40||104||Represents a hot shower temperature.|
|100||212||Represents boiling point of water|
|180||356||Represents baking temperature in an oven.|
Key Inferences about Fahrenheit and Celsius
- Celsius and Fahrenheit are commonly misspelled as Celcius and Farenheit.
- The formula to find a Celsius temperature from Fahrenheit is: °F = (°C × 9/5) + 32
- The formula to find a Fahrenheit temperature from Celsius is: °°C = (°F - 32) × 5/9
- The two temperature scales are equal at -40°.
Oven temperature chart
|Fahrenheit||Celsius||Gas Mark||Warm or Not?|
|275° F||140° C||1||Very Cool or Very Slow|
|300° F||150° C||2||Cool or Slow|
|325° F||165° C||3||Warm|
|350° F||177° C||4||Moderate|
|375° F||190° C||5||Moderate|
|400° F||200° C||6||Moderately Hot|
|425° F||220° C||7||Hot|
|450° F||230° C||8||Hot|
|475° F||245° C||9||Hot|
|500° F||260° C||10||Very Hot|
History of The Two Most Popular Temperature Units
The Fahrenheit temperature scale is named after the German physicist Daniel Gabriel Fahrenheit in 1724 and was originally used for temperature measurement through mercury thermometers that he invented himself.
Meanwhile, the Celsius scale was originally called centigrade but later came to be named after Swedish astronomer Anders Celsius in 1742. But when the scale was first introduced, it was quite the reverse of what it is today. Anders labeled 0 Degree Celsius as the boiling point of water, while 100 denoted the freezing point.
However, after Celsius passed away, Swedish taxonomist Carl Linnaeus flipped it to the opposite, the same as it is used today.
While this is the formula that is used for the conversion from Fahrenheit to Celsius, there are few diversions and it is not always a perfect conversion either making it slightly more difficult than what appears to be.
All said and done, one must understand that since both the scales are offset, meaning that neither of them is defined as starting from zero, there comes a slightly complicated angle to the above-mentioned formula.
Besides, the two scales do not start with a zero, and they both add a different additional value for every unit of heat. This is why it is not every time possible to get an exact value of the conversion by applying the formula.
Reverse Conversion: Celsius to Fahrenheit