Centigrade vs Fahrenheit cheat sheet: Difference between revisions
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Revision as of 11:03, 10 December 2022
Celsius = 5/9 (F - 32)
Fahrenheit = (9/5 C) + 32
| C | F | How does it feel? |
|---|---|---|
| 0° | 32° |
cold |
| 5° | 41°
<! — merged — > | |
| 10° | 50° |
chilly |
| 15° | 59°
<! — merged — > | |
| 20° | 68° | cool |
| 25° | 77° | warm |
| 30° | 86° | hot |
| 35° | 95° | tropical |
| 40° | 104° | melting point |
(2C° - 0.1(2C°)) + 32
Double C and add 32 becomes less accurate as the temperatures rise. It is exactly right at 0 C, off by 8 at 40 C, and off by 20 at 100 C.
- The doubling is off by 10%. 2 is 10/5, but the correct formula is 9/5, so the right factor is nine/tenths below the fudge factor.
- Double C, subtract roughly 10% of that product from itself, then add 32 improves the result.
| C | F | 2*C + 32 |
|---|---|---|
| 0° | 32° | 32° |
| 5° | 41° | 42° |
| 10° | 50° | 52° |
| 15° | 59° | 62° |
| 20° | 68° | 72° |
| 25° | 77° | 82° |
| 30° | 86° | 92° |
| 35° | 95° | 102° |
| 40° | 104° | 112° |
Feelings, whoa-oh-oh-oho, feelings
| C | feels |
|---|---|
| 0°..9° | cold |
| 10°..19° | chilly |
| 20°..24° | cool |
| 25°..29° | warm |
| 30°..34° | hot |
| 35°..39° | tropical |
| 40°+ | unendurable |
