What does this tool do?
Rebar weight is the total length multiplied by the unit weight of the bar size. This calculator also converts a lap allowance into the number of stock bars required and shows the metric weight.
The Formula
Weight (lb) = Total length × Weight per ft; Bars = ⌈Total length × (1 + Lap ÷ 100) ÷ Bar length⌉Frequently Asked Questions
How much does #4 rebar weigh?
#4 bar weighs about 0.668 lb per ft, so 200 ft is roughly 134 lb.
How much lap should I allow?
Common laps are 30–40 bar diameters, but the structural drawing and code govern. The percentage here is only a planning allowance.