• �� 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: http://www.sizes.com/units/temperature_centigrade.htm http://www.sizes.com/units/temperature_Fahrenheit.htm
• 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.
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• 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: http://www.wbuf.noaa.gov/tempfc.htm
• http://www.onlineconversion.com/temperature.htm 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!