Rebar Size Chart. The nominal diameter of a deformed bar is equivalent to the diameter of a plain bar having the same weight per foot as the deformed bar. Opting for a desired length of rebar is.
U.s.rebarsizes:imperialbardesignationsrepresentthebardiameterin fractionsof1/8inch,suchthat#8=8/8inch=1inchdiameter.area=(bar size/9)2suchthatareaof#8=(8/9)2=0.79inch.thisappliesto#8barsand smaller.largerbarshaveaslightlylargerdiameterthantheonecomputedusing the1/8inchconvention. When using the imperial measurement system, the most common rebar sizes are #4 and #5 rebar. The most commonly used rebars in retaining walls are #3, #4 and #5.