How thick is a #3 bar in inches?

The thickness of a #3 bar, which is a steel reinforcing bar (rebar), is standardized in the construction industry. A #3 bar has a nominal diameter of 3/8 of an inch. This is a critical specification used when determining the necessary reinforcement for concrete structures, as the size of the rebar impacts the overall strength and support of the concrete.

When choosing the correct answer, it's essential to consider that rebar sizes are defined by their diameter, and a #3 bar specifically has that established measurement of 3/8”. Other options do not accurately reflect the size of a #3 bar, as they represent different diameters that would not correspond to the standards set for rebar sizing. This precise specification helps architects, engineers, and builders ensure that they use the correct rebar for their projects.