Steel Rebar Calculator

The complete rebar calculator suite — weight, slab, spacing, development & lap length, cutting length, column & beam steel, tonnage and cost.

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Rebar Weight Chart (kg per metre)

Metric

Økg/mkg/ft12 m

Imperial (US #)

#Ølb/ftkg/m

Frequently Asked Questions

How do you calculate rebar weight?

Rebar weight per metre = d² ÷ 162.28, where d is the bar diameter in mm. Multiply by length and quantity for the total.

How do I calculate rebar for a concrete slab?

Bars one way = floor((slab dimension − 2×cover) ÷ spacing) + 1, both directions, × the bar's kg/m.

What is the development length of rebar?

Per IS 456, Ld = (φ × 0.87 × fy) ÷ (4 × τbd).