Centigrade vs Fahrenheit cheat sheet: Difference between revisions

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::: fast, overstating approximation: double C and add 32
::: fast, overstating approximation: double C and add 32
:::: the doubling is off by 10%
:::: the doubling is off by 10%
:::: double C, subtract 10% of that result from the result, add 32
:::: double C, subtract 10% of that product from itself, then add 32


{|{{Prettytable}}
{|{{Prettytable}}
Line 38: Line 38:
|align="right"| 40
|align="right"| 40
| 104
| 104
|}
; 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.
{|{{Prettytable}}
|- valign="top"
! C
! F
! 2*C + 32
|- valign="top"
|align="right"| 0
| 32
| 32
|- valign="top"
|align="right"| 5
| 41
| 42
|- valign="top"
|align="right"| 10
| 50
| 52
|- valign="top"
|align="right"| 15
| 59
| 62
|- valign="top"
|align="right"| 20
| 68
| 72
|- valign="top"
|align="right"| 25
| 77
| 82
|- valign="top"
|align="right"| 30
| 86
| 92
|- valign="top"
|align="right"| 35
| 95
| 102
|- valign="top"
|align="right"| 40
| 104
| 112
|}
|}

Revision as of 10:21, 2 December 2020

Celsius = 5/9 (F - 32)

Fahrenheit = (9/5 C) + 32

fast, overstating approximation: double C and add 32
the doubling is off by 10%
double C, subtract 10% of that product from itself, then add 32
C F
0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
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.
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
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