Rebar Weight Takeoff
ASTM A615 nominal bar weight per foot x total linear feet, to tons and cost. A #5 bar (1.043 lb/ft) x 500 ft -> 522 lb (0.26 ton); a #8 (2.670) at the same length weighs 1,335 lb (0.67 ton), more than double for the #5-to-#8 jump. Rebar is bought by weight. Add lap and waste before the takeoff. The shop drawings and mill weights govern.
Formula and source
weight = unit_wt(bar_size) x total_len_ft; tons = weight / 2000; cost = weight x price_per_lb.
The ASTM A615 nominal reinforcing-bar unit weights (#3 0.376 lb/ft ... #18 13.60 lb/ft), by name.
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