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Rebar Calculator

Bar conversion, weight take-off and cutting plans in metric units. Unit weight uses w = 0.006165·d² (kg/m).

Original Size (mm)

Original Number of Bars

Or Enter Steel Area As (mm²)

Convert To Size (mm)

Equivalent Number of Bars

Formula: n_new = (n_old × A_old or As) / A_new

Bar Diameter, d (mm)

Steel Grade FY 415–500

Piece Length (m)

Extra per Piece (m)

Takeoff Mode

Quantity (pcs)

Waste/Loss (%)

Stock Bar Length (m)

Pieces

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Total Length (m)

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Total Weight (kg)

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Total Steel Area As

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Unit weight w = 0.006165×d². Area As = π/4×d². Waste applies to total length.

Auto Pack into Stock Bars of (m)

Show Table up to (bars)

Enter inputs and click Generate.

Bar Ø	Pieces	Piece Len	Extra	Net/pc	Total Len	Waste	Wt	As/pc	As total
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Tip: For hooks, add multiples of bar diameter (9d for 90°, 12d for 135°). For laps, add lap length (≈ 50d tension lap).