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Converting fahrenheit to celsius

thescreensavers

thescreensavers

Diamond Member
F to C


100C --- Xc
____ = ___
212 F --- 78F


(--- used as spacing)

Work properly?

If I do it on my phone is gives me 25.56C- the correct answer according to google is 25.56, but why does the formula not work out correctly?


If I use my calculator with that formula I get 36.79??


Why, thanks
 
im gonna guess its a order of operations issue, either your phone or calc is doing something out of order
 
Because it's wrong.

F = 1.8*Grad+32

There's a DC offset of 32 degrees Fahrenheit at freezing. You can't assume that they are related purely by a ratio.
 
😕 What is this mess? Why not just use:

F = 1.8C + 32.

There, easy to estimate in your head. Double the Celcius, add 32, and you're within a few degrees.
 
Never used that formula.
Much simpler to subtract 32 from F
Then multiply times .556

Works as long as you dont need lots of precision.

So 80F - 32 = 48
48 x .556 = 26.6 C
 
Originally posted by: thescreensavers
Originally posted by: Brainonska511
Why not use this one?

[°F] = [°C] · 9/5 + 32 or [°C] = ([°F] - 32) · 5/9
Click to expand...

I know this is the proper way but why does my formula not work?
Click to expand...

Because the deviations between 1 deg C is not the same as the deviation between 1 deg F.
 
personally i just do the C*2+30 method and its close enough, unless its important then i just google it and let it do the math for me
 
Originally posted by: thescreensavers
Originally posted by: Brainonska511
Why not use this one?

[°F] = [°C] · 9/5 + 32 or [°C] = ([°F] - 32) · 5/9
Click to expand...

I know this is the proper way but why does my formula not work?
Click to expand...

Because there is an offset between C and F. 0 C = 32 F, so when you convert, you need to take into account that offset.

You can graph it (C on one axis, F on the other) and you'll see that it doesn't pass through the origin.
 
Yep that's correct. While they both measure temperature, their unit size is different, hence the required conversion.
Your ratio doesn't work because...basically you aren't converting the temperature...just picking one set of equal points on the scales and trying to linearly extrapolate another temperature, that ratio is not such.
 
Originally posted by: bonkers325
the relationship between F and C is not linear, therefore the formula u are using is incorrect
Click to expand...

Fail! It is linear but the OP is missing a constant term.
 
Originally posted by: thescreensavers
F to C


100C --- Xc
____ = ___
212 F --- 78F


(--- used as spacing)

Work properly?

If I do it on my phone is gives me 25.56C- the correct answer according to google is 25.56, but why does the formula not work out correctly?


If I use my calculator with that formula I get 36.79??


Why, thanks
Click to expand...

because they're offset by a constant!!!
 
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