• ALoafOfBread@lemmy.ml
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    1 year ago

    For easier mental C -> F conversion, take (2C)-(2C/10)+32 where C = temp in c.

    16c × 2 = 32

    32/10 = 3.2

    32 - 3.2 = 28.8

    28.8+32 = 60.8, which is exactly correct.

    Or if you just want a rough estimate for weather, 2C+(22 to 32) gets you close enough with easier mental math

    16x2+30 = 62, just 1 degree off.

    37x2+30 = 104 is like 6 degrees off, though. The further from zero you are, the smaller the number you should add.