Because　of　the　predominance　of　construction　techniques,　a　solid　knowledge　of　reinforced　concrete　principles　and　rules　is　necessary　and　crucial.　This　study　focuses　on　a　comparative　studies　of　different　sizing　standards,　the　Euro　Code　2,　the　Egyptian　Code　203　and　the　Algerian　Code　93　for　a　rectangular　reinforced　concrete　section　subjected　to　simple　bending　in　limit　states　and　is　well　supported　on　one　hand　by　one　of　the　determining　factors　in　design　and　on　the　other　hand　by　the　economy　and　security.　The　comparison　of　sizing　standards　in　the　limit　states　will　assist　the　designer　in　their　choice　of　a　suitable　design　code.