Rebar Calculator
Lay out a two-way grid at your spacing, count the runs in each direction including both edge bars, total the linear feet, convert to weight with your bar's pounds per foot, and round the purchase up to whole stock bars.
Rebar Calculator
Lay out a two-way grid at your spacing, count the runs in each direction including both edge bars, total the linear feet, convert to weight with your bar's pounds per foot, and round the purchase up to whole stock bars.
Method and assumptions
Figur turns your measurements into purchase quantities with standard geometry: it computes the area, length, or volume, applies the waste or spacing you enter, and rounds up to whole purchase units. Everything is calculated locally in your browser.
- Purchase quantities round up to whole units (sheets, bundles, boards, bars, or packages) because suppliers do not sell fractions.
- Assumed coverages and package sizes (for example, 3 bundles per square or 4×8 sheets) are common conventions; verify your product label and supplier.
- The waste percentage is applied exactly as entered; complex cuts, patterns, and damage can require more.
- The result does not replace your field measurements, plans, or local code requirements.
This tool provides a planning takeoff, not a binding bid, structural design, or engineering advice. Confirm quantities with field measurements, your supplier, and the applicable professionals before buying.
Sources and references
No external data source is required: this calculator applies standard geometry to the measurements, coverages, and waste you enter.
Frequently asked questions
What bar weight should I enter?
Standard weights per foot are 0.376 lb for #3, 0.668 lb for #4, and 1.043 lb for #5 rebar. The default assumes #4, the most common size in residential slabs.
Does this include laps, chairs, or dowels?
No. Lap splices, chairs, corner bars, and dowels into existing concrete add material beyond the clean grid counted here, so add them from your plan before ordering.