Centigrade vs Fahrenheit cheat sheet: Difference between revisions

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Line 9: Line 9:
! How does it feel?
! How does it feel?
|- valign="top"
|- valign="top"
|align="right"| 0
|align="right"| 0°
| 32
| 32°
| rowspan="2"|  
| rowspan="2"|  
cold  
cold  
|- valign="top"
|- valign="top"
|align="right"| 5
|align="right"| 5°
| 41
| 41°
<!-- merged -->
<!-- merged -->
|- valign="top"
|- valign="top"
|align="right"| 10
|align="right"| 10°
| 50
| 50°
| rowspan="2"|  
| rowspan="2"|  
chilly
chilly
|- valign="top"
|- valign="top"
|align="right"| 15
|align="right"| 15°
| 59
| 59°
<!-- merged -->
<!-- merged -->
|- valign="top"
|- valign="top"
|align="right"| 20
|align="right"| 20°
| 68
| 68°
| cool
| cool
|- valign="top"
|- valign="top"
|align="right"| 25
|align="right"| 25°
| 77
| 77°
| warm
| warm
|- valign="top"
|- valign="top"
|align="right"| 30
|align="right"| 30°
| 86
| 86°
| hot
| hot
|- valign="top"
|- valign="top"
|align="right"| 35
|align="right"| 35°
| 95
| 95°
| tropical
| tropical
|- valign="top"
|- valign="top"
|align="right"| 40
|align="right"| 40°
| 104
| 104°
| melting point
| melting point
|}
|}
Line 61: Line 61:
! 2*C + 32
! 2*C + 32
|- valign="top"
|- valign="top"
|align="right"| 0
|align="right"| 0°
| 32
| 32°
| 32
| 32°
|- valign="top"
|- valign="top"
|align="right"| 5
|align="right"| 5°
| 41
| 41°
| 42
| 42°
|- valign="top"
|- valign="top"
|align="right"| 10
|align="right"| 10°
| 50
| 50°
| 52
| 52°
|- valign="top"
|- valign="top"
|align="right"| 15
|align="right"| 15°
| 59
| 59°
| 62
| 62°
|- valign="top"
|- valign="top"
|align="right"| 20
|align="right"| 20°
| 68
| 68°
| 72
| 72°
|- valign="top"
|- valign="top"
|align="right"| 25
|align="right"| 25°
| 77
| 77°
| 82
| 82°
|- valign="top"
|- valign="top"
|align="right"| 30
|align="right"| 30°
| 86
| 86°
| 92
| 92°
|- valign="top"
|- valign="top"
|align="right"| 35
|align="right"| 35°
| 95
| 95°
| 102
| 102°
|- valign="top"
|- valign="top"
|align="right"| 40
|align="right"| 40°
| 104
| 104°
| 112
| 112°
|}
|}


Line 105: Line 105:
! feels
! feels
|- valign="top"
|- valign="top"
|align="right"|0..9
|align="right"|0°..9°
|cold
|cold
|- valign="top"
|- valign="top"
|align="right"|10..19
|align="right"|10°..19°
|chilly
|chilly
|- valign="top"
|- valign="top"
|align="right"|20..24
|align="right"|20°..24°
|cool
|cool
|- valign="top"
|- valign="top"
|align="right"|25..29
|align="right"|25°..29°
|warm
|warm
|- valign="top"
|- valign="top"
|align="right"|30..34
|align="right"|30°..34°
|hot
|hot
|- valign="top"
|- valign="top"
|align="right"|35..39
|align="right"|35°..39°
|tropical
|tropical
|- valign="top"
|- valign="top"
|align="right"|40+
|align="right"|40°+
|unendurable
|unendurable
|}
|}

Revision as of 10:58, 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
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