# how to convert pounds to feet? building copper coil

Discussion in 'General Electronics Chat' started by ElectromagnetNewbee, Sep 27, 2014.

1. ### ElectromagnetNewbee Thread Starter Member

Jul 13, 2014
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0
i finally got the chance to work on the math for building a coil.

My end result was in "pounds".

How do I covert it to feet or inches or whatever?

2. ### ronv AAC Fanatic!

Nov 12, 2008
3,404
1,478
You can google it and find a site that gives you weight per 1000 feet of copper wire.

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3. ### alfacliff Well-Known Member

Dec 13, 2013
2,449
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look for an AWG, american wire guage wire table. tht has the specs for wire.

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4. ### #12 Expert

Nov 30, 2010
16,705
7,355
You're looking for a chart like this one:

• ###### chart 001.JPG
File size:
196.7 KB
Views:
53
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Jul 13, 2014
69
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ha. nice.

6. ### ElectromagnetNewbee Thread Starter Member

Jul 13, 2014
69
0
5v/3.33 = 1.50 ohms
datasheet says AWG 24 to find resistance per pound.
it has 24.9870 ohms per pound.
1/20.9870 = 0.0476
0.0476*1.50 = 0.0714 Pounds of coil.

Give me the calculation algorithm for this?

7. ### #12 Expert

Nov 30, 2010
16,705
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Glad you could see the humor in that post.

I stole that chart from a place that was going out of business and have it hanging in my shop, but you need one of your own so you don't have to check the Internet every time you need to do a calculation.

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8. ### #12 Expert

Nov 30, 2010
16,705
7,355
No, 1.50 ohms x 1 pound /24.987 ohms = .0600 pounds.

My chart says 20.702 ohms per pound in "single layer of enamel" wire, size 24 AWG.

1.50/20.702 = .0724568 pounds

Who ya' gonna trust? Some chart on the Internet or a poster from the 1960's?

Last edited: Sep 27, 2014
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9. ### shteii01 AAC Fanatic!

Feb 19, 2010
3,515
515
Copper density is 8.96 grams per centimeter cubed.

24 AWG has cross sectional area of 0.205 millimeters squared. That would be 0.00205 centimeters squared.

Multiply the two and you get 0.018368 grams per centimeter. This tells us mass per unit of length. Convert your pounds to grams and find out how long you wire is in centimeters.

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