this post was submitted on 12 Sep 2026
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Mildly Interesting
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I prefer the converted fractions for ease. Your solution while right will confuse most Americans. (1.8x-40c)+32=-40f
Dear fellow Americans: Fun tip, lazy (but inaccurate) math is (2x-40c)+30= -50f which when you get to normal ranges works well enough in a margin of error. Or just learn to enjoy the beautiful thing that is Celsius and stop using/converting to Fahrenheit.
Americans use fractions daily. The rest of the avoids them. The dimensional analysis maybe.
I've done 9/5+32 in my head so much it's easier and faster for me. Then it's 100% accurate to boot.
is -40 not a normal temperature, at least compared with +30c?
Normal should be subjective normal, -40 is an extreme temp and over 40c is also extreme. I’m talking 5-25c where the lazy math works well enough.
So 20c is 68f proper conversion or 70f with lazy. 30, is 86f proper and 90f lazy. Basically for a normal day the temp is close enough that no one would notice.