28 mm rebar weight
4.830 kg/m · 3.246 lb/ft
28 mm rebar has a nominal diameter of 28 mm and a cross-sectional area of 616 mm².
28 mm rebar weight calculator
Weight of standard bar lengths
| Bars | 6 m (kg) | 12 m (kg) |
|---|---|---|
| 1 | 29.0 | 58.0 |
| 10 | 289.8 | 579.6 |
| 50 | 1,449.0 | 2,898.0 |
| 100 | 2,898.0 | 5,796.0 |
Bars per tonne
| Bar length | Bars per tonne |
|---|---|
| 6 m | 34.5 |
| 9 m | 23.0 |
| 12 m | 17.3 |
One tonne of 28 mm rebar is 207 m per tonne. Use this to turn a weight on a delivery note into a bar count.
How the weight is calculated
Area = π ÷ 4 × 28² = 615.8 mm². Weight per metre = area × 7850 kg/m³ = 615.8 × 10⁻⁶ m² × 7850 = 4.834 kg/m. The d² ÷ 162 rule gives 784 ÷ 162 = 4.840 kg/m.
Deformed bars and TMT bars are sold by nominal diameter and nominal mass; the ribs are already allowed for, and standards accept a small mass tolerance per bar. See the rebar weight formula guide.
28 mm rebar per square metre of slab
Weight of 28 mm rebar in a slab or wall for common spacings, for one layer in one direction and for bars both ways. Add laps, hooks and chairs on top.
| Spacing (centres) | One direction (kg/m²) | Both directions (kg/m²) |
|---|---|---|
| 100 mm | 48.30 | 96.60 |
| 125 mm | 38.64 | 77.28 |
| 150 mm | 32.20 | 64.40 |
| 200 mm | 24.15 | 48.30 |
| 250 mm | 19.32 | 38.64 |
| 300 mm | 16.10 | 32.20 |
Compared with nearby sizes
| Bar | kg/m | lb/ft | vs this bar |
|---|---|---|---|
| 20 mm rebar | 2.470 | 1.660 | −49 % |
| 25 mm rebar | 3.850 | 2.587 | −20 % |
| 28 mm rebar | 4.830 | 3.246 | — |
| 32 mm rebar | 6.310 | 4.240 | +31 % |
| 40 mm rebar | 9.860 | 6.626 | +104 % |
Bars this heavy are used in heavily loaded columns, transfer beams, piles, bridge decks and large foundations. The nearest US bar is #9 rebar (28.7 mm, 5.060 kg/m).
Frequently asked questions
What is the weight of 28 mm rebar per metre?
28 mm rebar weighs 4.830 kg/m (3.246 lb/ft). By the rule of thumb d squared over 162: 28 x 28 / 162 = 4.840 kg/m.
How much does a 12 m bar of 28 mm rebar weigh?
57.96 kg (4.830 kg/m × 12 m). A 6 m bar weighs 28.98 kg.
How many 12 m bars of 28 mm rebar are in a tonne?
About 17.3 bars, or 207 m per tonne.
What is the US equivalent of 28 mm rebar?
The nearest US bar is #9 rebar (28.7 mm, 5.060 kg/m). Check the steel area in the design before substituting one for the other.
How is the weight of 28 mm rebar calculated?
Area = π ÷ 4 × 28² = 615.8 mm². Weight per metre = area × 7850 kg/m³ = 615.8 × 10⁻⁶ m² × 7850 = 4.834 kg/m. The d² ÷ 162 rule gives 784 ÷ 162 = 4.840 kg/m.
How much 28 mm rebar is needed per square metre at 150 mm spacing?
One layer at 150 mm centres needs 32.20 kg/m² in one direction, 64.40 kg/m² for bars both ways, plus laps.
Other bar sizes
6 mm rebar · 8 mm rebar · 10 mm rebar · 12 mm rebar · 14 mm rebar · 16 mm rebar · 20 mm rebar · 25 mm rebar · 32 mm rebar · 40 mm rebar · 50 mm rebar
Full rebar weight chart · Steel weight calculator
Data adapted from Wikipedia, "Rebar" (CC BY-SA 4.0).