Centigrade vs Fahrenheit cheat sheet: Difference between revisions

Revision as of 11:00, 2 December 2020

Celsius = 5/9 (F - 32)

Fahrenheit = (9/5 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.

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 |- valign="top"
 |align="right"| 0Â°
-| 32Â°
+|align="right"| 32Â°
-| 32Â°
+|align="right"| 32Â°
 |- valign="top"
 |align="right"| 5Â°
-| 41Â°
+|align="right"| 41Â°
-| 42Â°
+|align="right"| 42Â°
 |- valign="top"
 |align="right"| 10Â°
-| 50Â°
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 |- valign="top"
 |align="right"| 15Â°
-| 59Â°
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-| 62Â°
+|align="right"| 62Â°
 |- valign="top"
 |align="right"| 20Â°
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+|align="right"| 68Â°
-| 72Â°
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 |- valign="top"
 |align="right"| 25Â°
-| 77Â°
+|align="right"| 77Â°
-| 82Â°
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 |- valign="top"
 |align="right"| 30Â°
-| 86Â°
+|align="right"| 86Â°
-| 92Â°
+|align="right"| 92Â°
 |- valign="top"
 |align="right"| 35Â°
-| 95Â°
+|align="right"| 95Â°
-| 102Â°
+|align="right"| 102Â°
 |- valign="top"
 |align="right"| 40Â°
-| 104Â°
+|align="right"| 104Â°
-| 112Â°
+|align="right"| 112Â°
 |}