Science, Tech, Math › Science How to Convert Fahrenheit to Celcius Share Flipboard Email Print Illustration by Hugo Lin. ThoughtCo. Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated May 07, 2019 Here is how to convert °F to °C. This is actually Fahrenheit to Celsius and not Fahrenheit to Celcius, though the mis-spellings of the temperature scales are common. So are the temperature scales, which are used to measure room temperature, body temperature, set thermostats, and take scientific measurements. Temperature Conversion Formula The temperature conversion is easy to do: Take the °F temperature and subtract 32.Multiply this number by 5.Divide this number by 9 to obtain your answer in °C. The formula to convert °F to °C is: T(°C) = (T(°F) - 32) × 5/9 which is T(°C) = (T(°F) - 32) / 1.8 °F to °C Example Problem For example, convert 68 degrees Fahrenheit into degrees Celsius: T(°C) = (68°F - 32) × 5/9 T(°C) = 20 °C It's also easy to do the conversion the other way, from °C to °F. Here, the formula is: T(°F) = T(°C) × 9/5 + 32 T(°F) = T(°C) × 1.8 + 32 For example, to convert 20 degrees Celsius to the Fahrenheit scale: T(°F) = 20°C × 9/5 + 32 T(°F) = 68 °F When doing the temperature conversions, one quick way to make certain you did the conversion right is to remember Fahrenheit temperatures are higher than the corresponding Celsius scale until you get down to -40°, which is where the Celsius and Fahrenheit scales meet. Below this temperature, degrees Fahrenheit are lower than degrees Celsius.