Rebar count, lap splices, total length and weight for continuous concrete footings
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Continuous footings under walls are usually reinforced with two or more horizontal bars running the full length. Rebar comes in stock lengths, so long runs need overlapping lap splices, and every lap adds bar. This tool counts the stock bars for each run, adds the laps, and optionally adds cross bars across the width.
Bars are held 3 inches inside the concrete at the ends and sides, the minimum cover for concrete cast against earth. The lap defaults to 40 bar diameters, a common spec (20 inches for #4 bar), but your plans or engineer set the actual lap, so change it to match. Corner and intersection bends are not included.
Need the concrete too? The concrete footing calculator sizes the pour and forms, and the foundation load calculator checks the footing width.
| Bar | Diameter | Weight (lb/ft) |
|---|---|---|
| #3 | 0.375" | 0.376 |
| #4 | 0.5" | 0.668 |
| #5 | 0.625" | 1.043 |
| #6 | 0.75" | 1.502 |
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