Live tool
Reinforcing steel weight, worked out in the page.
Steel is ordered by the piece and invoiced by the kilo. This converts between the two: pick a diameter, set a length, read the weight. Or enter a tonnage and get the number of bars it comes to.
Diameter, mm
Common sizes in the Saudi market. 12 m is the usual stock length.
- Mass per metre
- 0kg/m
- Per 12 m bar
- 0kg
- Bars per tonne
- 0pcs
- Weight of this quantity
- 0tonnes
Order
Nothing added yet. Build a multi-size order and the totals appear here.
| Ø mm | Length m | Pieces | kg | tonnes | Remove |
|---|---|---|---|---|---|
| Total | 0 | 0 | 0 | ||
m = 0.006165 × d² kg/m These are nominal weights, from the nominal diameter and a density of 7,850 kg/m³. What a mill actually delivers falls inside the tolerance band of the governing standard, and where it falls inside that band is a commercial question, not a technical one. I wrote about that here.
Common questions
How is the weight of reinforcing steel calculated?
From the nominal diameter: mass per metre = 0.006165 × d² kg/m, with d in millimetres. The constant comes from a steel density of 7,850 kg/m³. A 16 mm bar is 0.006165 × 16² = 1.578 kg/m, so a 12 m bar weighs about 18.94 kg.
How many bars are in one tonne?
Divide 1,000 kg by the weight of one bar. For 16 mm at 12 m that is 1,000 ÷ 18.94, about 52.8 bars. Enter a tonnage in the calculator and it gives the number of bars directly.
Why is the invoiced weight different from the calculated weight?
The calculator gives the nominal weight. A mill delivers inside the tolerance band of the governing standard, so the weighed steel can sit a little above or below the nominal figure and still comply. Where it falls inside that band is a commercial question, which is why the tolerance belongs in the contract.
Which bar lengths and diameters can I use?
Any. The common Saudi market sizes, 10 to 32 mm, are one tap away, and 12 m is the usual stock length, but both can be changed, including diameters not on the list.
Can I keep a record of an order?
Yes. Add several lines to build a multi-size order with totals, then copy the table or use Print / PDF to save a dated sheet you can attach to a quotation.
Is anything I type sent anywhere?
No. The calculation runs in your browser, and nothing you enter leaves the page.
For beams, channels, angles, bars, flats, pipe and tube, use the section weight calculator.