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Type the characters you see in this image:Try different image Conditions of Use Privacy Policy © 1996-2014, Amazon.com, Inc. or its affiliates Quick Celsius (°C) / Fahrenheit (°F) Conversion:measure/images/thermometer.js?mode=boxes Type a value in either box Or use the slider Or the Interactive Thermometer Or this method:
(Explanation Below ...) Typical Temperatures(only bold are exactly the same)
Some Tricks:Daily Temperatures: these three conversions "flip the digits" (accurate within 1°): °C °F Oven Temperatures: in the range 150 to 200 °C we can double °C to get °F (accurate within 8°F):
Going the other way: for the range 300 to 400 °F we can halve °F to get °C (accurate within 4°C). ExplanationThere are two main temperature scales:
They both measure the same thing (temperature!), but use different numbers:
Like this: Looking at the diagram, notice:
And so, to convert: from Celsius to Fahrenheit: first multiply by 180100, then add 32 from Fahrenheit to Celsius: first subtract 32, then multiply by 100180 180100 can be simplified to 95, and 100180 can be simplified to 59, so we get this: °C to °F: Divide by 5, then multiply by 9, then add 32 °F to °C: Subtract 32, then multiply by 5, then divide by 9 Example: Convert 25° Celsius (a nice warm day) to FahrenheitFirst: 25° / 5 = 5 Example: Convert 98.6° Fahrenheit (normal body temperature) to CelsiusFirst: 98.6° − 32 = 66.6 We can swap the order of divide and multiply if we want, but don't change the add or subtract. So this is also OK: Example: Convert 98.6° Fahrenheit to Celsius (again)First: 98.6° − 32 = 66.6 (Same answer as before, was it easier or harder this way?) We can write them as formulas:Celsius to Fahrenheit: (°C × 95) + 32 = °F Other Methods That WorkUse 1.8 instead of 9/59/5 is equal to 1.8, so we can also use this method: Celsius to Fahrenheit: °C ×
1.8 + 32 = °F To make "×1.8" easier we can multiply by 2 and subtract 10%, but it only works for °C to °F: Celsius to Fahrenheit: (°C × 2) less 10% + 32 = °F Example: Convert 20° Celsius (A nice day) to Fahrenheit
Add 40, Multiply, Subtract 40Since both scales cross at −40° (−40° C equals −40° F) we can:
Like this: Celsius to Fahrenheit: Add 40, multiply by 9/5, then subtract 40 Example: Convert 10° Celsius (A cool day) to Fahrenheit
Quick, but Not AccurateCelsius to Fahrenheit: Double, then add 30 Examples °C → °F:
Examples °F → °C:
Footnote: Temperature is a measure of how fast an object's particles are moving. 1041, 1042, 1043, 1044, 3724, 3725, 3726, 3727, 3728, 3729 |