Centigrade vs Fahrenheit cheat sheet: Difference between revisions

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Fahrenheit = (9/5 C) + 32
Fahrenheit = (9/5 C) + 32
::: Fast, overstating approximation: double C and add 32.
:::: The doubling is off by 10%. 2 is 10/5; the correct formula is 9/5, so the correct factor is nine/tenths of the fudge factor.
:::: double C, subtract 10% of that product from itself, then add 32


{|{{Prettytable}}
{|{{Prettytable}}
Line 13: Line 9:
! How does it feel?
! How does it feel?
|- valign="top"
|- valign="top"
|align="right"| 0
|align="right" style="background:#C800FF"| 0°
| 32
|align="center"| 32°
| colspan="2"| cold|
| rowspan="2"|  
cold  
|- valign="top"
|- valign="top"
|align="right"| 5
|align="right" style="background:#C800FF"| 5°
| 41
|align="center"| 41°
<!-- merged -->
<!-- merged -->
|- valign="top"
|- valign="top"
|align="right"| 10
|align="right" style="background:#069EEE"| 10°
| 50
|align="center"| 50°
|  
| rowspan="2"|
chilly
|- valign="top"
|- valign="top"
|align="right"| 15
|align="right" style="background:#069EEE"| 15°
| 59
|align="center"| 59°
|
<!--  merged  -->
|- valign="top"
|- valign="top"
|align="right"| 20
|align="right" style="background:#B6DAEC"| 20°
| 68
|align="center"| 68°
|  
| cool
|- valign="top"
|- valign="top"
|align="right"| 25
|align="right" style="background:#FFEE00"| 25°
| 77
|align="center"| 77°
|  
| warm
|- valign="top"
|- valign="top"
|align="right"| 30
|align="right" style="background:#FFDD00"| 30°
| 86
|align="center"| 86°
|  
| hot
|- valign="top"
|- valign="top"
|align="right"| 35
|align="right" style="background:#FF6F00"| 35°
| 95
|align="center"| 95°
|  
| tropical
|- valign="top"
|- valign="top"
|align="right"| 40
|align="right" style="background:#FF0000"| 40°
| 104
|align="center"| 104°
|  
| melting point
|}
|}


; 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.
== (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.
 
{|{{Prettytable}}
{|{{Prettytable}}
|- valign="top"
|- valign="top"
Line 57: Line 61:
! 2*C + 32
! 2*C + 32
|- valign="top"
|- valign="top"
|align="right"| 0
|align="right"| 0°
| 32
|align="right"| 32°
| 32
|align="left"| 32°
|- valign="top"
|align="right"| 5°
|align="right"| 41°
|align="left"| 42°
|- valign="top"
|align="right"| 10°
|align="right"| 50°
|align="left"| 52°
|- valign="top"
|align="right"| 15°
|align="right"| 59°
|align="left"| 62°
|- valign="top"
|align="right"| 20°
|align="right"| 68°
|align="left"| 72°
|- valign="top"
|align="right"| 25°
|align="right"| 77°
|align="left"| 82°
|- valign="top"
|align="right"| 30°
|align="right"| 86°
|align="left"| 92°
|- valign="top"
|align="right"| 35°
|align="right"| 95°
|align="left"| 102°
|- valign="top"
|- valign="top"
|align="right"| 5
|align="right"| 40°
| 41
|align="right"| 104°
| 42
|align="left"| 112°
|}
 
== Feelings, whoa-oh-oh-oho, feelings ==
 
{|{{Prettytable}}
|-
! C
! feels
|- valign="top"
|- valign="top"
|align="right"| 10
|align="right"|0°..9°
| 50
|cold
| 52
|- valign="top"
|- valign="top"
|align="right"| 15
|align="right"|10°..19°
| 59
|chilly
| 62
|- valign="top"
|- valign="top"
|align="right"| 20
|align="right"|20°..24°
| 68
|cool
| 72
|- valign="top"
|- valign="top"
|align="right"| 25
|align="right"|25°..29°
| 77
|warm
| 82
|- valign="top"
|- valign="top"
|align="right"| 30
|align="right"|30°..34°
| 86
|hot
| 92
|- valign="top"
|- valign="top"
|align="right"| 35
|align="right"|35°..39°
| 95
|tropical
| 102
|- valign="top"
|- valign="top"
|align="right"| 40
|align="right"|40°+
| 104
|unendurable
| 112
|}
|}


; Feelings, whoa-oh-oh-oho, feelings
[[File:Fahrenheit vs celsius.jpg]]

Latest revision as of 12:22, 10 December 2022

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

(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

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