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Not only are Celsius and Fahrenheit degrees different sizes ... And to do it the other way around: 72 Fahrenheit is 40/2, which is 20 Celsius. You can even use 30 instead of 32, ...
From Celsius to Fahrenheit: Double the Celsius number and add 30. Formula: °F ≈ (°C × 2) + 30 From Fahrenheit to Celsius: Subtract 30 from Fahrenheit and divide by 2. Formula: °C ≈ (°F - 30) ÷ 2 ...
C to F: Multiply the temperature by 2 and then add 30 (actual formula is multiply by 1.8, add 32) ex: 22 C is roughly equal to 74 degrees using my method, actual conversion is 71.6 ...