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R/AUSTRALIA AND NEW ZEALAND

AS/NZS 4671 Reo Weight Chart (kg/m)

Mass per metre, area and metres per tonne for AS/NZS 4671 bars from N10 to N40, with a calculator and Excel download.
Bar sizes
9
Range
N10–N40
kg/m, d in mm
d² / 162
Used in
Australia and New Zealand
S-01/WEIGHT CHART9 SIZES

AS/NZS 4671 bar sizes and weights

AS/NZS 4671 rebar sizes and nominal weights
Bar sizeDiameter (mm)Area (mm²)Mass (kg/m)Metres per tonne
N101078.50.6171,622
N1212113.10.8881,126
N1616201.11.578634
N2020314.22.466405
N2424452.43.551282
N2828615.84.834207
N3232804.26.313158
N36361,017.97.990125
N40401,256.69.865101
Download Excel (.xlsx)Download CSV

Nominal masses calculated from each bar's nominal diameter at 7,850 kg/m³. Printed tables can differ in the third decimal place through rounding, and delivered bars vary within the rolling tolerance AS/NZS 4671 allows.

S-02/CALCULATORMETRES → KG

AS/NZS 4671 steel weight calculator

Enter each bar size with the number of bars and the length of each. The total updates as you type, with a summary by size.

  • 147.96 kg
Total steel

147.96 kg

= 0.148 tonnes

Nominal mass only. Add laps, hooks and wastage for an order quantity; rolling tolerance means delivered weight can differ slightly from nominal.

S-03/READING THE SIZESAS/NZS 4671

How AS/NZS 4671 bars are specified

AS/NZS 4671 is the Australian and New Zealand standard for steel reinforcing materials. Deformed bars on Australian projects are almost always 500N: grade 500, normal ductility.

Australian drawings mark deformed bars as N followed by the diameter, so N12 is a 12 mm normal-ductility deformed bar and N24 is 24 mm.

AS/NZS 4671 grades combine strength and ductility class: 500N is the normal-ductility deformed bar used on most Australian work, 500L is low-ductility (common in mesh) and 250N is plain round bar.

To estimate steel, multiply the total length of each bar size by its mass per metre, then add laps, hooks and a wastage allowance before ordering. Masses on a schedule are nominal; the bars delivered can come in slightly over or under.

The same chart for other standards: IS 1786, BS 4449 and ASTM A615.

S-04/QUESTIONS5

An N12 bar has a nominal mass of 0.888 kg per metre. A 12 m length weighs 10.66 kg.

About 634 m. An N16 bar weighs 1.578 kg/m, so one tonne is 1,000 ÷ 1.578 metres.

Mass in kg per metre = d² ÷ 162, where d is the bar diameter in millimetres. It is the bar's cross-sectional area multiplied by the density of steel, 7,850 kg/m³. For a 16 mm bar: 16² ÷ 162 = 1.58 kg/m. Multiply by the total length of bars to get the weight.

They are nominal masses calculated from each bar's nominal diameter at 7,850 kg/m³, which is how nominal mass is derived. Printed tables can differ in the third decimal place because of rounding. Delivered bars vary within the rolling tolerance the standard allows, so check the mill certificate for actual weights.

N is the ductility class: normal ductility, grade 500. The number is the nominal diameter in millimetres. An N16 bar is 16 mm and weighs 1.578 kg per metre nominal.
ARCHED / ESTIMATING

Need the full bar bending schedule?

A weight chart gives you the steel for one bar. A schedule needs every bar on the drawings: shapes, cutting lengths, laps and the totals by size. Send the reinforcement drawings and we return the BBS in Excel, checked and signed off by an engineer.