Estimate the rebar needed for a slab in both directions.
Slabs are reinforced with a two-way grid. Bars run along the length and width, with the count driven by spacing, and each bar gets an overlap allowance where pieces splice. Estimating rebar in both directions and adding laps gives a realistic purchase for a reinforced slab.
Rebar Length
Rebar = bars along length + bars along width, each plus overlap
Rebar = bars along length + bars along width, each plus overlap Slabs are reinforced with a two-way grid. Bars run along the length and width, with the count driven by spacing, and each bar gets an overlap allowance where pieces splice.
Estimating rebar in both directions and adding laps gives a realistic purchase for a reinforced slab.
This calculator takes 5 inputs: Slab length, Slab width, Spacing, Overlap, Include overlap. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.