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<h4 class="dechead">On One Hand: Consider the Use
You should install rebar in a grid formation. If you pour a concrete slab for heavy duty use, such as a driveway, you will need to make the grid sections smaller, about 18 inches each. If the slab will have lighter duty use, such as for a patio, you can likely use a 24-inch grid.
On the Other: Check Building Codes
Contact your city's building commission or department of building and safety to confirm the requirements for your area. Be sure to state what function the concrete slab will perform so that you get the correct legal requirement.
Bottom Line
Install rebar in a grid with sections no larger than your building code specifies. Divide your slab's length and width by the grid size to calculate how many rebar pieces you need. If you meet or exceed local building code requirement for the amount of rebar, your slab will pass inspection if needed and will function well.
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