How this calculator works
Estimate reinforcing bar count, total length and weight for a rectangular mat.
bar mass ≈ d²/162 kg/m; count ≈ dimension ÷ spacing + 1
Structure · Calculator
Estimate reinforcing bar count, total length and weight for a rectangular mat.
Estimate reinforcing bar count, total length and weight for a rectangular mat.
The calculator uses the following core relationship:
Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.
A rebar calculator helps estimate reinforcing steel quantities for slabs, foundations and concrete structures by calculating bar count, length and weight.
Common rebar sizes and unit weights can help estimate steel requirements.
Construction tip: Always verify dimensions, material specifications and project conditions before ordering materials.
Estimate reinforcing bar count, total length and weight for a rectangular mat.
The calculator uses inputs such as Slab length (m), Slab width (m), Bar spacing (mm), Bar diameter (mm), and Layers. Use values from your drawings, measurements, product data, or project specifications.
Use outputs such as Bars along length, Bars along width, Total rebar length, and Steel weight for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.
Continue your estimate with related Construction Calc Lab.