You need the size of the rebar involved to calculate the weight. Charts can be found at CRSI.org or Rebarapps.com.
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. You need to know the size of the bar to calculate.
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12" of #4 rebar = 0.668 lb/ft
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.
diameter 16
1yrd of grout will fill 100 block with typical 32" on center vertical rebar and 48" horizontal rebar.
25mm = 3.973 kg/m