Table 7-1.U.S. Standard Reinforcing Bars

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Eleven standard sizes of reinforcing bars are in use today. Table 7-1 lists the bar number, area in square inches, weight, and nominal diameter of the 11 standard sizes. Bars No. 3 through 11 and 14 and 18 are all deformed bars. Table 7-2 lists the bar number, area in square inches and millimeters, weight in pounds per foot as well as kilograms per meter, and nominal diameter of the 8 standard metric sizes. At various sites overseas, rebar could be procured locally and could be metric. Table 7-3 is given for comparison. Remember that bar numbers are based on the nearest number of one-eighth inch included in the nominal diameter of the bar. To measure rebar, you must measure across the round/square portion where there is no deformation. The raised portion of the deformation is not measured when measuring the rebar diameter.

Table 7-1. - U.S. Standard Reinforcing Bars

U.S. Standard Reinforcing Steel Bars

Bar Size Designation	Area Square Inches	Weight lb Per Foot	Diameter inches	Diameter mm
#3	.11	.376	.375	9.53
#4	.20	.668	.500	12.7
#5	.31	1.043	.625	15.88
#6	.44	1.502	.750	19.05
#7	.60	2.044	.875	22.23
#8	.79	2.670	1.000	25.40
#9	1.00	3.400	1.128	28.58
#10	1.27	4.303	1.270	31.75
#11	1.56	5.313	1.410	34.93
#14	2.25	7.650	1.693	43.00
#18	4.00	13.600	2.257	57.33

Table 7-2.—Metric Reinforcing Bars

METRIC REINFORCING STEEL BARS

BAR SIZE DESIGNATION	AREA Sq. Inches	Area Sq. mm	WEIGHT Lb Per Ft	WEIGHT KG/M	DIAMETER Inches	DIAMETER mm
10m	.16	100	.527	.785	.445	11.3
15m	.31	200	1.054	2.355	.630	16.0
20m	.47	300	1.563	2..355	.768	19.5
25m	.78	500	2.606	3.925	.992	25.2
30m	1.09	700	3.649	5.495	1.177	29.9
35m	1.55	1000	5.213	7.850	1.406	35.7
45m	2.33	1500	7.820	11.775	1.710	43.7
55m	3.88	2500	13.034	19.625	2.220	56.4