this post was submitted on 10 Oct 2024
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American here, got stationed in Italy for a few years. Learning Celsius was easy with this in mind:
0 freezing
10 cool
20 nice
30 hot
40 sweltering
If you need to do the actual calculation, double the celsius value, subtract the tens digit (i.e. -10%), add 32. For example:
Double it: 20 * 2 = 40
Subtract the tens digit: 40 - 4 = 36
Add 32: 36+32 = 68
Cool!!
Or a "good enough" rough estimate is: double (the Celsius number) + 30
(0 * 2) + 30 = 30F freezing
(10 * 2) + 30 = 50F cool
(20 * 2) + 30 = 70F nice
(30 * 2) + 30 = 90F hot
(40 * 2) + 30 = 110F sweltering
In reverse: subtract 30 (from the Fahrenheit number), and divide by 2
(30F - 30) / 2 = 0 C freezing
(40F - 30) / 2 = 5 C freezing
(50F - 30) / 2 = 10 C cool
(60F - 30) / 2 = 15 C cool
(70F - 30) / 2 = 20 C nice
(80F - 30) / 2 = 25 C nice
(90F - 30) / 2 = 30 C hot
(100F - 30) / 2 = 35 C hot
(110F - 30) / 2 = 40 C sweltering
(120F - 30) / 2 = 45 C start praying
It's easier to just remember a few key values and estimate based on those. I know the conversions for every ten degrees Celsius from -10 to 30