0:02
If you're sharing a recipe with a friend
0:04
in Europe and it says to bake at 350°
0:07
Fahrenheit, what Celsius value should
0:09
they set their oven to?
0:14
Fahrenheit and Celsius start at
0:16
different points and their degrees are
0:18
different sizes. So, we need two steps
0:21
and we need to run those steps in the
0:27
On the Fahrenheit scale, water freezes
0:31
On the Celsius scale, it freezes at
0:33
zero. So, to line the two scales up, we
0:39
Water boils at about 212° Fahrenheit or
0:42
100° Celsius. So, on the Fahrenheit
0:45
scale, the gap between freezing and
0:50
On the Celsius scale, that same gap is
0:56
180 / 100 is 1.8. So, each Celsius
1:01
degree corresponds to 1.8 Fahrenheit
1:04
degrees. So, second, we divide by 1.8.
1:11
To convert 350° Fahrenheit to Celsius,
1:15
we subtract 32 then divide by 1.8. 350 -
1:24
318 / 1.8 is about 177°
1:29
Celsius. So, that's what your friend
1:31
should set their oven to.
1:36
You can check this on
1:37
metric-conversions.org.
1:47
Here's a common mistake, dividing first
1:58
That's about 14° C too cool. Always take
2:08
There's a shortcut you can do in your
2:09
head. Subtract 30, then have it.
2:13
If you're converting a mild 68° F,
2:16
our shortcut gives 19° C.
2:19
The exact answer is 20°, so it's only 1°
2:25
Let's try our recipe. 350 - 30 halved is
2:33
That's about 17° too cool.
2:38
Let's see where the shortcut is useful
2:41
and where we should be careful.
2:45
both give exactly 10° C.
2:48
That's the only place our shortcut is
2:52
At boiling point, the shortcut says 91°
2:56
not 100. The further you go from 50° F,
3:04
Here's why. Our shortcut divides by two,
3:08
but the real conversion factor is only
3:10
1.8. Dividing by too big a number pulls
3:14
every answer toward 10° C,
3:16
and the farther you go from 50° F,
3:19
the bigger the error.
3:23
the shortcut reads too warm. Above it,
3:26
the shortcut reads too cold.
3:31
So, for an exact answer, subtract 32
3:34
from the Fahrenheit temperature, then
3:36
divide by 1.8. If you want a quick
3:39
calculation you can do in your head,
3:41
subtract 30 and have it, but that only
3:43
gives a rough estimate.
3:49
To get exact answers every time, you can
3:51
use the Fahrenheit to Celsius converter
3:54
on metricconversions.org.
3:56
There's a link in the description below.
3:58
If you found this video useful, please
4:00
like and subscribe. If you have any
4:02
questions, please feel free to ask them
4:04
in the comments below.
4:11
Thanks for watching. Here's another
4:12
video you might enjoy.
