There are 225 2d roofing nails in a pound. If you need something longer like 1.75 inches that would be a five penny (5d) and there are only 145 in a pound.
http://wiki.answers.com/Q/How_many_roofing_nails_a...

There are not pounds in a gram. There are grams in a pound. There are 28 grams in 1 ounce, and 16 ounces in a pound. So 28 times 16 is 448, which is how many grams are in a pound.
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1. Measure each area of the roof, in feet, to determine how many shingles will be needed. 2. Multiply the length of each area by the width to determine the square footage. 3. Add
http://www.ehow.com/how_6372968_estimatepoundsro...

I believe you're asking how many pounds are in three tons. If i am correct the answer would add up to 2000 multiplied by 3 which is. 6000 lb.
http://wiki.answers.com/Q/How_many_pound_is_3T
