Calculate rebar quantity, weight, and cost for concrete reinforcement. Get accurate estimates for slab, foundation, and structural projects.
Slab Dimensions
Rebar Size
Standard residential - driveways, garage floors, footings
Bar Spacing
Standard residential slabs
Optional: Cost Estimation
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Planning a concrete slab, driveway, or foundation? Our rebar calculator determines exactly how much reinforcing steel you need. Calculate bar quantities, total weight, tie wire requirements, and material costs for any concrete reinforcement project.
Rebar (reinforcing bar) strengthens concrete by providing tensile strength that concrete alone lacks. Calculating rebar involves determining the number of bars needed in each direction based on spacing, then computing total linear feet, weight, and the number of standard 20-foot bars to purchase. Proper spacing and coverage ensures structural integrity per building codes.
Rebar Quantity Formula
Bars = (Length ÷ Spacing) + 1Calculate exact quantities to avoid costly over-ordering or project delays from material shortages.
Know the total weight for delivery planning, crane requirements, and structural considerations.
Estimate material costs accurately with current pricing for rebar and tie wire.
Select appropriate bar sizes and spacing to meet structural requirements and building codes.
Optimize bar lengths and cuts to minimize waste and save money on materials.
Plan tie wire needs, delivery requirements, and labor estimates based on accurate quantities.
Calculate rebar grid requirements for residential driveways that support vehicle traffic.
Determine reinforcement needs for residential and commercial foundation slabs.
Plan rebar layout for garage slabs that support vehicles and equipment.
Calculate rebar for pool surrounds that need to withstand moisture and foot traffic.
Generate accurate material takeoffs for bidding concrete reinforcement jobs.
Plan your concrete project with confidence, knowing exactly what materials to purchase.
For residential slabs like patios and walkways, #3 rebar (3/8") is typically sufficient. Driveways and garage floors usually require #4 (1/2"). Foundations and structural slabs typically need #5 (5/8") or larger. Always consult local building codes or a structural engineer for specific requirements.