Concrete Strengths
Rebar
Welded Wire Mesh
Pan Slabs
Rebar
Rebar is sized nominally
by “eighths of an inch” of the bar’s diameter. A #3 bar is 3/8” in diameter.
A #6 bar is ¾” in diameter. 3/4 is the same as 6/8. Every bar can be
measured in eighths of an inch. A #10 bar is about 10/8” in diameter.
This is the same as 1.27”.
Diameter Lbs/lnft Diameter Metric bar size
(metric)
No. 2 0.250” 0.167 lbs 6.35mm No. 6
No. 3 0.375” 0.376 lbs 9.52mm No. 10
No. 4 0.500” 0.668 lbs 12.7mm No. 13
No. 5 0.625” 1.043 lbs 15.8mm No. 16
No. 6 0.750” 1.502 lbs 19.05mm No. 19
No. 7 0.875” 2.044 lbs 22.225mm No. 22
No. 8 1.000” 2.670 lbs 25.4mm No. 25
No. 9 1.128” 3.400 lbs 28.65mm No. 29
No. 10 1.270” 4.303 lbs 32.25mm No. 32
No. 11 1.410” 5.313 lbs 35.81mm No. 36
No. 14 1.693” 7.650 lbs 43.0mm No. 43
No. 18 2.257” 13.60 lbs 57.33mm No. 57
A few years ago, the metric equivalents were given nominal size names, but they were redesignated. It used to run 5, 10, 15, 20 on to 55 in increments of 5. But then someone decided otherwise.
Here’s what they used
to be called:
Imperial size Former metric name Current metric name
No. 2 No. 5 No. 6
No. 3 No. 10 No. 10
No. 4 not used No. 13
No. 5 No. 15 No. 16
No. 6 No. 20 No. 19
No. 7 not used No. 22
No. 8 No. 25 No. 25
No. 9 No. 30 No. 29
No. 10 not used No. 32
No. 11 No. 35 No. 36
No. 14 No. 45 No. 43
No. 18 No. 55 No. 57