• To convert Fahrenheit temperatures into Celsius: - Begin by subtracting 32 from the Fahrenheit number. - Divide the answer by 9. - Then multiply that answer by 5. Here's an example: Change 95 degrees Fahrenheit to Celsius: 95 minus 32 is 63. Then, 63 divided by 9 is 7. Finally, 7 times 5 is 35 degrees Celsius. • To convert Celsius temperatures into Fahrenheit: - Begin by multiplying the Celsius temperature by 9. - Divide the answer by 5. - Now add 32. Here's an example: Change 20 degrees Celsius to Fahrenheit: 20 times 9 is 180. Then 180 divided by 5 is 36. Finally, 36 plus 32 is 68 degrees Fahrenheit. • Using an Algebraic Formula: Here is the algebraic formula used for conversion from Fahrenheit to Celsius: - Tc=(5/9)*(Tf-32) Tc=temperature in degrees Celsius Tf=temperature in degrees Fahrenheit Now, to convert from Celsius to Fahrenheit,: - Tf=(9/5)*Tc+32 Tc=temperature in degrees Celsius Tf=temperature in degrees Fahrenheit
  • Some historical notes and definitions to complement Flizzera's contribution: The Celcius Temperature Scale, is the one that registers the freezing point of water as 0 degrees C and the boiling point as 100 degrees C under normal atmospheric pressure. It is also called Centigrade Scale, and was named after the Swedish astronomer, Anders Celcius (1701-1744) who devised the centigrade thermometer. It is used in the countries using the metric/decimal system (centimeters, meters, kilometers, litres and so on). The Fahrenheit Temperature Scale, is the one that registers the freezing point of water as 32 degrees F and the boiling point as 212 degrees F at one atmosphere of pressure. Was named after the German physicist who invented the mercury thermometer and developed the scale of temperature that bears his name (1686-1736). It is used in countries using the non-metric system (inches, feet, yards, galons and so on). Conversion Formula: Degrees Celsius = (Degrees Fahrenheit - 32)*5/9
  • Just to add a further bit of clarification, when Fahrenheit worked out his temperature scale he tried to take two values that he thought would be constants to define 0 degrees and 100. 0 he defined as the lowest temperature that could be achieved using a slury of ice, salt, and water. For 100 he took his assistant's temperature. He did good at picking a nice reproducible value for 0, but not for 100. Body temerature is not constant even when a person is healthy and his assistant was slightly feverish that day.
  • The Celsius and Fahrenheit scales are based on the scales of Anders Celsius and D.G.Fahrenheit. Both today use fixed points of the triple point and the boiling point of water. (The triple point is where water vapor, ice and liquid are in equilibrium and is within a tenth of a degree of the more difficult to measure freezing point). On the Celsius scale these fixed points are 0 (triple point) 100 (boiling point) On the Fahrenheit scale these fixed point are 32 (triple point) 212 (boiling point) Celsius = (Fahrenheit - 32)*5/9 Fahrenheit = Celsius*9/5 + 32 The two scales agree at -40. i.e. -40 F = -40 C For more information see:
  • Just want to see if I can make this a little simpler by taking out a whole step: C to F: C * 1.8 + 32 = F (Ex: 15C to F) 15 * 1.8 = 27 (+32) = 59F F to C: F - 32 / 1.8 = C (Ex: 90F to C) 90 - 32 = 58 (/ 1.8) = 32.2C Its a little easier to memorize!
  • Celsius to Farenheit= Multiply by 9, divide by 5, add 32. Example: Body temperature is 37 degrees Celsius. 37*9=333 333/5=66.6 66.6+32=98.6 degrees Farenheit. Farenheit to Celsius= Minus 32, multiply by 5, divide by 9. Example: Bioling temperature of water is 212 degrees Farenheit. 212-32=180 180*5=900 900/9=100 degrees Celsius.
  • Or to put into purely mathematical terms: °C = (°F - 32) * 5/9 If you think your way through the problem it is not difficult to derive this equation for yourself as I just did for this answer. Two easy to remember temperatures in both systems are the freezing and boiling points of water. In Celsius, these values are 0° and 100° and in Fahrenheit they are 32° and 212° respectively. So, to work your way through this you first note that there is a difference of 32 between the number for the freezing point between the Celsius and Fahrenheit scales. So you have to first subtract 32° from the Fahrenheit temperature. Then you notice that the numerical range between freezing and boiling is 100° for Celsius and 180° for Fahrenheit. So, to convert from Fahrenheit to Celsius you must multiply by the Celsius temperature range and divide by the Fahrenheit temperature range. This gives us 100/180. This fraction simplifies to 5/9 when you divide both top and bottom by 20. So, you put it all together, you get the equation with which I started this answer. To go the other direction you just solve the above equation for °F to get °F = °C * 9/5 +32
  • go on google because it is a good search engine
  • I found a perfect website, extremely simple to use in order to convert from Celsius to Fahrenheit and from Fahrenheit to Celsius:
  • there ya go.
  • Take the temp in C, multiply by 9, divide by 5 then add 32. For most estimates it is enough to double it and add 30 but the above is the exact conversion
  • I was always taught that to convert Celsius to Fahrenheit you multiplied by 9, divided by 5 (ie multiply by 1.8) and then add 32. This is at least a very close approximation, and is correct within a degree. There is probably a more exact way that somebody may be able to help you out with.
  • There are different ways to do it. Some examples are... F= (Cx1.8)+32 or F= (Cx9/5)=32 In this case, use the reciprocal. If you add the 32 first, it will not be the accurate answer. You will need to multiply first and then add. To convert back, simply reverse the steps.
  • EVIL has it correct. However, I have a quick & dirty method that I developed. Take the Celsius number and double it, then add 30. You will be within a few degrees in the normal air temperature of the tropics to the poles. For example, if the Celsius temperature is 20 degrees., double it to 40 and then add 30, which leads to a Fahrenheit estimate of 70 degrees. The actual converted temperature is 68, which is close enough to determine if you need a sweater. Similarly, if the temperature is -15 C., perform the following calculation: (-15x2)+30=0 (0 degrees F.) The real conversion is 5 degrees F. The further from Freezing you get, the less accurate, but it's plenty accurate enough if you cant multiply by 1.8 in your head before adding 32. To go from F to C, subtract 30 from F, then cut the resulting number in half. The answer is the approximate C temperature. Have a pleasant autumn!
  • 1. Multiply the Celsius temperature by 9 2. Divide the answer by 5 3. Add 32 orrr..visit even better is where they say "Convert just about anything to anything else." shoot you mebbee could convert tons to meters, or Celsius to centigrade or Ferennait to Fahrenheit, Rankine to Reaumur, atheists to Christians, the possibilities are endless. Me, I just bought a thermometer that has both scales, F and C. Math makes my head hurt. I mean in the recent "Battle of the Temperatures" I bet a bundle on Celsius, he won, as you know, by a TKO in the 5th round but I just broke even because in calculating the odds I forgot to add 32. I thought the odds were 9 to 5. Hey, you changed the question after I answered it. No fair, and prohibited by by Article I, section 9 of the U.S. Constitution;"No query of attainder or ex post facto Question shall be posted." None-the-less my answer still stands; 1. Multiply the Celsius temperature by 9 2. Divide the answer by 5 3. Add 32 As to "What is the difference between Celsius and Fahrenheit?" maybe there is some mathematical term for that (C X 9/5)-32 ratio but I dunno. One difference is that in writing and speaking one should say "Fahrenheit X degrees" and "X degrees Celsius" The big difference is that Fahreheit doesn't make much sense and Celsius is based on the decimal system. There are a bunch of stories attempting to explain how Fahrenheit, a German-Dutch physicist, devised his scale in 1724. In his scale the melting point of ice 32* and the boiling point of water 212* are 180 degrees apart. Maybe he thought that was neat, being opposites of each other. He also had a third point, the temperature of his body which he claimed was 98*. Or maybe he said it was 96. Apparently hetook a blank thermometer, marked the melting point of ice and the boiling point of water and for some reason said they were 180 degrees apart. Then for some other reason he said his body temperature was 96 marking up and down from that resulted in the freezing point and boiling point being 32 and 212. Celsius, a Swedish astronomer, took a different and more scientific approach in 1744. He took a blank thermometer, marked the boiling point of water and the melting point of ice and marked it off into 100 equal degrees, which is why it is sometimes called the centigrade scale. 100 is an easy to work with number, unlike 180. He didn't care what his body temp was, he made the thermometer and then took his temp. He was also the first person to figure out that water boils at a higher temp at sea level than it does at higher altitudes. Or more precisely that water’s boiling point varies as a function of atmospheric pressure. Generally speaking there is more air pressure at sea level than up in the mountains. He also figured out that air pressure has no effect on the melting point of ice. That's why he decided to use the melting point(or freezing point) as the start of his thermometer. Strangely enuff, to us at least, he called that point 100 degrees and then the temperatures went DOWN to the boiling point at 0. Apparently the famous Swedish botanist, Carolus Linnaeus, was the first to suggest and use a reversed Celsius scale with boiling at 100. I for one am glad, " Man I am freezing! It must be ahunnert dagrees out there."
  • notmrjohn is absolutely right, but a quick approximation for a normal range of air temperatures is to double the degrees Celsius and add 30.
  • To convert Celsius into Fahrenheit, multiply the Celsius by 9/5 (nine fifths) and add 32. (A simpler way is by multiplying by 2 and adding 32, although it's not nearly as accurate).
  • The old thread about this:
  • Because Celsius is based on the freezing point of water, where as in Fahrenheit the freezing point of water is 32 degrees. At exactly 0 degrees Celsius, water freezes. At exactly 32 degrees Fahrenheit, water freezes as well. To figure out Fahrenheit the formula is: [℃] = ([°F] − 32) × 5⁄9
  • Those are different scales. Farenheit: "Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736), the German physicist who proposed it in 1724." There are a lot of versions on how he determined the scale used. You can read about it here: Celsius: "In 1742, Swedish Anders Celsius (1701 – 1744) created a "reversed" version of the modern Celsius temperature scale whereby zero represented the boiling point of water and one hundred represented the freezing point of water. In his paper Observations of two persistent degrees on a thermometer, he recounted his experiments showing that ice’s melting point was effectively unaffected by pressure. He also determined with remarkable precision how water’s boiling point varied as a function of atmospheric pressure. He proposed that zero on his temperature scale (water’s boiling point) would be calibrated at the mean barometric pressure at mean sea level." In 1744, coincident with the death of Anders Celsius, the famous Swedish botanist Carolus Linnaeus (1707 – 1778) effectively reversed. Celsius’s scale upon receipt of his first thermometer featuring a scale where zero represented the melting point of ice and 100 represented water’s boiling point.
  • Because: [°F] = [℃] × 9⁄5 + 32 > [℃] × 9⁄5 > [℃]
  • C = 5/9 (F - 32) F = (9/5 C) + 32
  • For a rough estimate I take Celsius and double it, add 32. It works pretty good until you get up high temps.
  • The truth of the matter appears (with a bit of conjecture) to be as follows: At first the range of temperatures, coldest (ice) and hottest (boiling water), as it appeared to human touch, was divided into 100 graduations for convenience: this was called a celsius (100-wise) or centigrade (graded-in-hundred) scale. Later, it was discovered that by dissolving certain substances (salt, saltpeter, etc) in the ice, colder still temperatures could be obtained. A guy named Fahrenheit, an experimenter of things scientific, took a blank thermometer and on it marked, by experiment, the three points (the coldest temperature attained by dissolving various things in ice, the raw ice temperature and the boiling water temperature. He named the coldest mark to be Zero. Next he measured the thermometer lengths between zero & ice and Ice & boing water and found them to be in the proportion of 8:45 or 16:90. Now 45 or 90 graduations between ice and boiling water would be even coarser a scale than Centigrade and so he adopted the proportion of 32:180 to devise a more sensitive scale. The coldest temperature was thus named zero, the ice 32 degrees and the boiling water 32+180 or 212 and this came to be known as Fahernheit scale. To sum up: Ice Temp = zero degree C or 32 degrees F Boiling Water Temp = 100 degrees C or 212 degree F Conversion: For converting Celcius to Fahrenheit, multiply Celcius by nine-fifth (9/5 or 1.80) and add 32. For converting Fahrenheit to Celcius first deduct 32 from Fahrenheit and muliply the remainder by five-ninth (5/9 or 0.56).
  • O.K. We all agree the muliply by nine and devide by five +32 is the most accurate and the other method double and add 30 is approximate. Well try this: Double the Celcius, take off 10% and add 32, eg: 20 doubled =40, -10% =36 +32. Go on try it, easy to work out in your head.

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