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 |