Rebar takeoff combines bar layout with stock lengths and theoretical unit weight. Lap splice length is not a universal multiple that a quantity calculator should design; use the structural documents and applicable code requirements.
Rebar takeoff = required bar count × cut length, grouped by bar size and shape. Convert total length to theoretical weight with published unit weights; use structural documents for lap and development lengths rather than a generic multiplier.
Published: September 30, 2026
Last reviewed: September 30, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Determine each bar mark, spacing, run length, layers, and repeated members from the drawings.
Keep different bar sizes and shapes on separate takeoff lines.
Multiply cut length by quantity and add specified hooks, bends, development extensions, and laps where shown.
Do not invent lap lengths to make the quantity complete.
Theoretical weight = total bar length × published unit weight for that bar size.
Use recognized reinforcing-bar dimensional data for the selected specification.
Develop a cutting plan before rounding total length into stock pieces.
Separate unavoidable trim waste from required structural length.
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| Step | Calculation | Result |
|---|---|---|
| Total length | 20×18 | 360 ft |
| #4 nominal weight | 360×0.668 lb/ft | 240.5 lb |
| Stock planning | Apply cutting plan | Project-specific |
Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.