Rebar Weight Calculator

Weight per Foot (lbs) is looked up purely from Bar Size against the ASTM A615 table, and it ranges from 0.376 lbs/ft for a #3 bar to 13.6 lbs/ft for a #18 bar -- roughly a 36x spread. Bar Length and Number of Bars only ever multiply that per-foot figure, so neither can produce a swing anywhere near that size on its own.

Only for the smaller sizes -- #3 through #8 follow that convention closely, where the bar number roughly equals the diameter in eighths of an inch. Sizes #9, #10, #11, #14, and #18 instead use a historical sizing convention based on old square bar stock, so their weight doesn't fall on the same even progression as the smaller bars. ASTM A615/A615M's own bar-size table reflects this history directly: it lists nominal weight, diameter, and cross-sectional area for each bar number as independent, standard-body-set values rather than values derived from a single diameter formula, which is why this calculator looks weight up from that table instead of computing it from bar number alone.

Yes -- Total Weight (lbs) is Weight per Foot times Bar Length times Number of Bars, and since both Bar Length and Number of Bars enter that formula as simple multiplying factors, a given percentage increase to either one raises Total Weight by that same percentage.

Estimated Cost applies a flat $0.65 per pound to the calculated Total Weight, which sits within rebar's typical historical market range but is not a live or regional price feed. Check current pricing with your supplier before using this figure for a firm material budget.