What is the diameter of #4 rebar in a bundle?

The diameter of #4 rebar is 0.5 inches. Rebar, or reinforcing bar, is categorized by numbers that correspond to its nominal diameter in eighths of an inch. For instance, #4 rebar has a nominal diameter of 4/8 inches, which simplifies to 0.5 inches. Understanding the sizing system of rebar is essential for ensuring structural integrity in concrete construction. Knowing these specifications helps in accurately calculating material requirements, ensuring that the right amount of reinforcement is utilized in a project, thereby enhancing safety and performance.