It is dependant on the size of the bar in question. Smaller bars have a smaller diameter and therfore more are required to equal a ton. Larger bars have larger diameters and less are required to make up a ton. Find the size you are looking on chart below than reference size to weight per foot so you can determine how much per ton.
Chart can be found at http://www.rebarapps.com/ARA_Links.html
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188 nos.of rebar
Oh, dude, you're asking me to do math? Seriously? Okay, fine. So, a 14mm rebar weighs about 1.178 kilograms per meter. And since there are 1000 kilograms in a ton, you'd have around 847 meters of 14mm rebar in a ton. But like, who's counting, right?
You have to find a chart that will indicate the weight per unit of measure for the appropriate rebar size. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.668 X 20 X 5 = 67 lbs. Charts are available throughout the web or at CRSI.org.
Mass per Meter Run in Kg
You have to find a chart that will indicate the weight per unit of measure for the appropriate rebar size. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.668 X 20 X 5 = 67 lbs. Charts are available throughout the web or at CRSI.org.