Centigrade vs Fahrenheit cheat sheet: Difference between revisions
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Fahrenheit = (9/5 C) + 32 | Fahrenheit = (9/5 C) + 32 | ||
{|{{Prettytable}} | {|{{Prettytable}} | ||
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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. | 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. | |||
{|{{Prettytable}} | {|{{Prettytable}} | ||
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== Feelings, whoa-oh-oh-oho, feelings == | == Feelings, whoa-oh-oh-oho, feelings == | ||
{|{{Prettytable}} | |||
|- | |||
! C | |||
! feels | |||
|- valign="top" | |||
|align="right"|0..9 | |||
|cold | |||
|- valign="top" | |||
|align="right"|10..19 | |||
|chilly | |||
|- valign="top" | |||
|align="right"|20..24 | |||
|cool | |||
|- valign="top" | |||
|align="right"|25..29 | |||
|warm | |||
|- valign="top" | |||
|align="right"|30..34 | |||
|hot | |||
|- valign="top" | |||
|align="right"|35..39 | |||
|tropical | |||
|- valign="top" | |||
|align="right"|40+ | |||
|unendurable | |||
|} | |||
Revision as of 10:54, 2 December 2020
Celsius = 5/9 (F - 32)
Fahrenheit = (9/5 C) + 32
| C | F | How does it feel? |
|---|---|---|
| 0 | 32 |
cold |
| 5 | 41 | |
| 10 | 50 |
chilly |
| 15 | 59 | |
| 20 | 68 | cool |
| 25 | 77 | warm |
| 30 | 86 | hot |
| 35 | 95 | tropical |
| 40 | 104 | melting point |
(2 × C) + 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 |