What is the diameter of #5 rebar?

The diameter of #5 rebar is 5/8 inch. In the rebar sizing system, the number preceding the term "rebar" indicates the diameter in eighths of an inch. Therefore, #5 rebar has a diameter of 5 eighths of an inch (5/8). This sizing convention is utilized in the construction industry to standardize the dimensions of steel reinforcement bars, ensuring compatibility in construction practices. Understanding these sizes is crucial for contractors when determining the required materials for structural reinforcement and meeting engineering specifications.