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Rebar Spacing Calculator
Linear feet, pieces, tie wire, and cost of rebar for a slab. 40x bar diameter lap splice reminder.
Updated April 2026
Rebar Spacing Calculator
Estimate rebar quantity, tie wire, and cost for a concrete slab.
Bars along length16
Bars along width10
Total linear feet392 ft
20 ft sticks needed20
Approx weight262 lb
Tie wire~120 ft
Estimated rebar cost$300
Edge clearance: keep rebar at least 3" from slab edges and 2" from the bottom.
Lap splice: overlap continuous bars by at least 20" (40× bar diameter) at splices.
Support: use chairs or dobies to hold bars off the ground during pour.
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What it does
Slab dimensions + rebar size + 16" OC = linear feet, pieces to buy (20 ft stock), tie wire, cost. Plus 40x lap splice reminder.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/rebar-spacing-calculator" width="100%" height="720" frameborder="0" loading="lazy" title="Rebar Spacing Calculator" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Enter slab dimensions.
- Pick rebar size + spacing.
- Read pieces + tie wire.
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