Construction · Calculator
Rebar Length Calculator
Calculate total rebar length needed for a grid or layout.
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Rebar Length Calculator
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Estimate the total linear feet of rebar needed for a grid layout in a slab.
Formula
Length = (L/spacing × W) + (W/spacing × L)Step-by-step
- Compute bars in each direction
- Multiply by perpendicular dimension
- Sum both directions
Example
20×20 ft slab, 12in spacing = 820 ft total.
FAQ
Does this include overlaps?+
No, add extra for lap splices (typically 30× bar diameter).
What spacing should I use?+
12 inches on center is common for residential slabs.
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