» Rebar steel Sizes and Grades «

Imperial bar appellations represent rebar stick diameters in fractions of an inch, such that #8 = ⁸/₈ inch = 1 inch diameter.

Imperial Bar Size	"Soft" Metric Size	Weight (^lb/_ft)	Nominal Diameter (in)	Nominal Diameter (mm)	Nominal Area (in²)
#3	#10	0.376	0.375	9.525	0.11
#4	#13	0.668	0.500	12.7	0.20
#5	#16	1.043	0.625	15.875	0.31
#6	#19	1.502	0.750	19.05	0.44
#7	#22	2.044	0.875	22.225	0.60
#8	#25	2.670	1.000	25.4	0.79
#9	#29	3.400	1.128	28.65	1.00
#10	#32	4.303	1.270	32.26	1.27
#11	#36	5.313	1.410	35.81	1.56
#14	#43	7.650	1.693	43	2.25
#18	#57	13.60	2.257	57.33	4.00

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Metric bar designation represents the specified rebar stick diameter in millimeters, rounded to the nearest 5 mm.

Metric Bar Size	Mass (^kg/_m)	Nominal Diameter (mm)	Cross-Sectional Area (mm²)
#10 M	0.785	11.3	100
#15 M	1.570	16.0	200
#20 M	2.355	19.5	300
#25 M	3.925	25.2	500
#30 M	5.495	29.9	700
#35 M	7.850	35.7	1000
#45 M	11.775	43.7	1500
#55 M	19.625	56.4	2500

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