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Old Feb 08, 2007, 05:36 PM
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Need easy g/m^2 to oz/yd^2 conversion

I am looking for a easy program or online conversion for g/m^2 to oz/yd^2 and vice versa.

Maybe even a chart that gives me the common weights of composite fabrics in metric and US weights.

Thanks in advance,
TommyT
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Old Feb 08, 2007, 05:49 PM
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From: http://www.onlineconversion.com/foru...1110473881.htm


Re: ounces/linear yd -> grams/linear meter
by Robert Fogt on 03/10/05 at 16:04:10

To calculate the conversion factor, you start with the basic units.

For this:
ounces/yard to grams/meter

You would use this formula:
(ounces to grams)/(yard to meter)

You need to know this:
ounces to grams
yards to meters

1 ounce = 28.349523125 gram
1 yard = 0.9144 meter

Now calculate:
ounce/yard * (28.349523125/0.9144) = gram/meter

Your conversion factor is 31.0034154910324, which we can just round to 31.

23.75 oz/yd * 31 = 736.25 g/m
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Old Feb 08, 2007, 11:12 PM
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mm not exactly.

Just use google.com! Type in oz/yd^2 to g/m^2 or vice versa g/m^2 to oz/yd^2 and hit enter. It does it for you.

1 oz / (yd^2) = 33.9057475 g / (m^2)

1 g / (m^2) = 0.0294935247 oz / (yd^2)

Hans
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Old Feb 09, 2007, 02:13 AM
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Hi Reinking

The conversion factor given by flybike (33.9) is right. The difference with the value you gave is that 31 is useful to convert oz/yd into g/m, but not oz/sqyd into g/sqm.

Rafael
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Old Feb 09, 2007, 12:35 PM
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Use the logic presented to compute oz/sqyd into g/sqm or simply take the reciprocal of the value shown in the example I posted.
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Last edited by reinking; Feb 09, 2007 at 01:25 PM. Reason: Answered the wrong question :-)
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Old Mar 25, 2016, 10:42 AM
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1 ounce = 28.349523125 gram
1 yard = 0.9144 meter
1 oz / yd^2 = 28.349523125 gram / (0,.9144 meter x 0.9144 meter) = 33.905747 g / m^2
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Old Mar 29, 2016, 10:11 AM
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We´ve found this tool quite useful: http://www.compositesconsultants.com/cats/tools.php
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Old Mar 29, 2016, 05:18 PM
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simple answer is to multiply or divide by 34 depending on which way you are doing the conversion.

and for more involved conversions this is the tool that everyone should have: http://joshmadison.com/convert-for-windows/ no installation needed, just stick it somewhere easily accessible like the quick launch bar. as downloaded it won't do weight per area conversions but you can add custom tabs to it for anything you want.
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Old Apr 28, 2016, 01:01 PM
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For those interested in the theory of units conversion from a retired physicist: (this would be a lot easier with real equations. If enough are interested, I could generate this in a pdf with those equations.)
No matter what we're converting, it all amounts to multiplying by the correct value of 1. The trick is to know what that is, and which way you go: divide or multiply.
Assuming you understand English and metric units, you can get get to anything by starting with some relationships that define the relationships between the two:
1 lb = 454 grams
(The physicist in me cringes: Pounds measure force, and grams measure mass. So, we'll all agree that we're talking about the force of gravity on 454 grams being one pound. I'll now step of the soapbox.)

1 in = 2.54 centimeters

The other thing to remember is DON'T FORGET THE UNTIS! Without them you can get lost.
So, let's convert oz/(yd*yd) to g/(m*m). As an example, I'll convert 1oz/yd^2 to gm/m^2

Since a pound is 16 ounces, we have 16 oz = 454 gms, or
1 = 454gms/16oz

So, 1oz/yd^2 = 1oz/yd^2*(454gm/16oz)
= 1oz/yd^2*28.375gm/oz

Now we note that:
1 yd = 36 inches, or
1 = 36in/yd

Adding that into the mix we get
2 oz/yd^2 = (1oz/yd^2*28.375gm/oz)/(36in/yd*36in/yd)
= 1oz/yd^2*0.02189429gm-yd^2/in^2

Finally, we need to convert square inches into square meters. Look at the definitions above, we see that

100in = 254cm = 2.54m (from 100cm = 1m)
or 1 = 100in/2.54m

So, 1oz/yd^2 = 1oz/yd^2*0.02189429gm-yd^2/in^2*(100in/2.54m*100/2.54m)
= 1oz/yd^2*33.936218gm-yd^2-m^2/in^20m^2


If we cancel out all the units, we get
1 oz/yd^2 - 33.93621gm/m^2 (Gee, that looks familiar)


Finally, we get our conversion factor:
1 = 33.93621(gm-m^2)/(oz/yd^2)

And now we see why units are important: If I want to convert oz/yd^2 to gm/m^2, I want the oz and yds to go away. If I multiply by my factor of

1 = 33.93621(gm-m^2)/(oz/yd^2)

the oz/yd^2 units cancel and I get the answer in gm/m^2. If I want to convert gm/m2 20 oz/yd^2, I divide and get the answer it oz/yd^2
Morale of the story: The statement "The conversion factor is 33.93621" doesn't have much meaning. What we want to say is "The conversion factor is 33.93621(gm-m^2)/(oz/yd^2)." That works.
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Old Apr 28, 2016, 05:05 PM
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Quote:
Originally Posted by ZAGNUT View Post
.................http://joshmadison.com/convert-for-windows/ ..............................
Wow! That is a good one Zagnut.
It even runs in my Linux Mint 17.2
Very convenient and quick.
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Old Apr 28, 2016, 08:41 PM
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Quote:
Originally Posted by Jim.Thompson View Post
Wow! That is a good one Zagnut.
It even runs in my Linux Mint 17.2
Very convenient and quick.
Yep, I use it often and I love the custom tab to stuff like cloth conversions, wingloadings etc.
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