Proof that girth affects size more than length

titsmagee9

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I was thinking about whether I'd rather gain a half inch in girth or a half inch in length, and decided to do some calculations, assuming a uniform circumference (not as troublesome as you might assume considering base girth is usually bigger than mid-shaft girth (what most people use), making up for some inconsistency/thinning above mid shaft).

A lot of you may be overwhelmed by the amount of equations/numbers in this post. To help that, I've bolded the important numbers.

Volume of a Cylinder: V = pi*r^2*h

Circumference (or girth): C = 2*pi*r or, rearranged, r = C/(2*pi)

Therefore: V = pi*(C/(2*pi))^2*h or, simplified, V = C^2/(4*pi)*h

So, with my size, a length (or h) of 6.75" and a girth (or C) of 5.75": V = (5.75)^2/(4*pi)*6.75 = 17.76 cubic inches

Length of 7.25" and girth of 5.75": V = (5.75)^2/(4*pi)*7.25 = 19.07 cubic inches

Length of 6.75" and girth of 6.25": V = (6.25)^2/(4*pi)*6.75 = 20.98 cubic inches

Now some of you may be saying, Hey, but a half inch increase in girth is proportionally greater than a half inch increase in length, given that generally girth is less than length (e.g. .5/6.75 = 7.4% but .5/5.75 = 8.7%). However correcting for this, and instead using a 10% increase (length of 7.425" or girth of 6.325") still shows us that girth is more important:

Length of 7.425" and girth of 5.75": V = (5.75)^2/(4*pi)*7.425 = 19.54 cubic inches

Length of 6.75" and girth of 6.325": V = (6.325)^2/(4*pi)*6.75 = 21.49 cubic inches

So as you can see, girth is more important in terms of total size than length.

Some further examples that illustrate this:

Length of 8" and girth of 5.5": V = (5.5)^2/(4*pi)*8 = 19.26 cubic inches

Length of 7" and girth of 6": V = (6)^2/(4*pi)*7 = 20.05 cubic inches

Length of 6" and girth of 6.5": V = (6.5)^2/(4*pi)*6 = 20.17 cubic inches

So, in conclusion, hats off to the girthy guys. And the opposite (hats on?) for those who only consider the length number when evaluating size.

And to the rare guys who are elite in length and girth, well you're just fucking huge.
 

D_Phil_S_Steen

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Yup. Put more simply, the volume of a cock is directly proportionate to the length and directly proportionate to the square of the radius. Therefore an increase in radius increasing the volume exponentially, whereas an increase in height just increases the volume in a linear fashion.

Yup, I'm a maths geek.
 

RigidDreamer

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Yup. Put more simply, the volume of a cock is directly proportionate to the length and directly proportionate to the square of the radius. Therefore an increase in radius increasing the volume exponentially, whereas an increase in height just increases the volume in a linear fashion.

Yup, I'm a maths geek.

Is it weird that I get turned on hearing people talk about math?


Perhaps this thread should be cross-referenced with this thread. Two math heavy threads in one day...
 

pcghabsy

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This is pretty damn obvious, isn't it? To be more accurate, volume is affected more by radius (which is squared) than length. "Size" is a fairly vague term though, and of course none of this accounts for practical sensations.
 
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Well obviously, since its volume is proportional to the square of the radius...
 

Mr.Stout

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He basically did all that math to show that bigger dimensions = bigger volumes. About as groundbreaking as using a calculator.


Well actually the point was to show that the differences in girth increase the overall size greater then the difference in length. So it is not just bigger dimensions= bigger volumes, but it is which dimensions produce the biggest difference.
 

Ed69

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This all sounds great!.....Until you find a woman like my wife,who does not like short and fat!...LOL

Enjoy what you have and find a partner that likes what you have to offer.
 
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554279

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The angle of the dangle is in direct proportion to the heat of the meat...

but the heat of the meat is controlled by the shake in her seat and only measured by the stain on the sheet...
 

confusedman

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Everything seems correct but what i believe is more important is the ratio length/girth in terms of shape and proportion.Ofcourse the ideal cock size must be more than 23cubic inches on average.A nice ration should be close to the phi number which is 1.21 if i remember correctly.
 

fowfer

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Me at ages(all BPEL):

16 years 5.5" x 5" = 10.94 cu.in. vol.
60 years 7.0" x 5.7" = 19.95 cu.in. vol.
and after PE
73 years 8.5" x 6.25" = 26.56 cu.in. vol.

Even though I am happy with my current size, I must confess, it has almost completely eliminated vaginal sex. My wife could barely handle the 7" x 5.7" but cannot the larger size. Thank goodness she has a big mouth. lol

fow
 

dirkjesje

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Everything seems correct but what i believe is more important is the ratio length/girth in terms of shape and proportion.Ofcourse the ideal cock size must be more than 23cubic inches on average.A nice ration should be close to the phi number which is 1.21 if i remember correctly.
Ridiculous. The ideal cock must be more than 23cubic inches on average?
Well a big cock starts already at 15cubic inches - and you set it more than 50% higher to be ideal?
The ideal cock is one that fits.
And at 20cubic inches or higher that's porn...

I've calculated and posted a volume percentage chart out of the Lifestyle Condoms study ( with an high average - because volunteers ) somewhere on this board. Look it up!
Yes, you're confused...

PS1 : a girth - even base girth - unpumped - above 8" is already ridiculous.
PS2 : Shane Diesel is just an hair of 7.5" in girth. Why don't I see such a dick in your pics?
 
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dirkjesje

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My length is around 9 and my girth is 6 and sometimes 6 1/4 if I am rock hard. Is that considered big?
If you wonders if that's big, you're not measuring correctly...
But however that's from 99.7100% ( very large ) to 99.9003% ( huge ) on the volume chart.
( from 1 in about 345 to 1 in about 1000 )
 
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shr1125

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Here's a good visual estimation:

Green = 8" length
Red = 6.5" length
Blue = 5" length

Compare all three lengths at a 4" Girth. The difference between them is ~4 cubic inches. Even though an 8" cock is 1.6 times longer than a 5" willie, when they both have 4.0" girth, the volumetric difference is only ~4ci. In other words, when girth is held constant at 4", the extra three inches in length (8" vs. 5") only increases volume by 4ci.

Now look at the red points (i.e., a 6.5" long cock). At 6.5" in girth, a cock that size has a volume of ~21 ci, but at a girth of 4", only about 7.5ci. That's almost three times larger in volume. When length is held constant (e.g., at 6.5"), an increase of girth from 4" to 6.5" accounts for a tripling in volume.

That's a lot.
 

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cadehung

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I appreciate this discussion of girth and how it's thought of as the less valued dick dimension. My cock measurement pics show that mine is 7.25" (7 1/4) long and 7.37" (7 3/8) in girth mid-shaft (fatter than it is long), for a volume of 31 cubic inches. It's 8" around at the base. According to “The Visualizer” website, the average hardon is 6.1" long and 4.8" in girth, for a volume of 11 cubic inches. That would make mine is 2.8 times the size of the average cock, the same as if it measured 10.5 inches long and 6 (still fat) inches in girth. The Visualizer says my cock size is "Extremely Rare". Math Geeks are welcome to check my calculations. Fans of girth, lets meat up.
 
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