12 mm rebar weight
0.888 kg/m · 0.597 lb/ft
12 mm rebar has a nominal diameter of 12 mm and a cross-sectional area of 113 mm².
12 mm rebar weight calculator
Weight of standard bar lengths
| Bars | 6 m (kg) | 12 m (kg) |
|---|---|---|
| 1 | 5.3 | 10.7 |
| 10 | 53.3 | 106.6 |
| 50 | 266.4 | 532.8 |
| 100 | 532.8 | 1,065.6 |
Bars per tonne
| Bar length | Bars per tonne |
|---|---|
| 6 m | 187.7 |
| 9 m | 125.1 |
| 12 m | 93.8 |
One tonne of 12 mm rebar is 1,126 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 × 12² = 113.1 mm². Weight per metre = area × 7850 kg/m³ = 113.1 × 10⁻⁶ m² × 7850 = 0.888 kg/m. The d² ÷ 162 rule gives 144 ÷ 162 = 0.889 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.
12 mm rebar per square metre of slab
Weight of 12 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 | 8.88 | 17.76 |
| 125 mm | 7.10 | 14.21 |
| 150 mm | 5.92 | 11.84 |
| 200 mm | 4.44 | 8.88 |
| 250 mm | 3.55 | 7.10 |
| 300 mm | 2.96 | 5.92 |
Compared with nearby sizes
| Bar | kg/m | lb/ft | vs this bar |
|---|---|---|---|
| 8 mm rebar | 0.395 | 0.265 | −56 % |
| 10 mm rebar | 0.617 | 0.415 | −31 % |
| 12 mm rebar | 0.888 | 0.597 | — |
| 14 mm rebar | 1.210 | 0.813 | +36 % |
| 16 mm rebar | 1.580 | 1.062 | +78 % |
Bars of this size are typical for slab and wall reinforcement, footings of houses, lintels and stirrups in larger beams. The nearest US bar is #4 rebar (12.7 mm, 0.994 kg/m).
Frequently asked questions
What is the weight of 12 mm rebar per metre?
12 mm rebar weighs 0.888 kg/m (0.597 lb/ft). By the rule of thumb d squared over 162: 12 x 12 / 162 = 0.889 kg/m.
How much does a 12 m bar of 12 mm rebar weigh?
10.66 kg (0.888 kg/m × 12 m). A 6 m bar weighs 5.33 kg.
How many 12 m bars of 12 mm rebar are in a tonne?
About 93.8 bars, or 1,126 m per tonne.
What is the US equivalent of 12 mm rebar?
The nearest US bar is #4 rebar (12.7 mm, 0.994 kg/m). Check the steel area in the design before substituting one for the other.
How is the weight of 12 mm rebar calculated?
Area = π ÷ 4 × 12² = 113.1 mm². Weight per metre = area × 7850 kg/m³ = 113.1 × 10⁻⁶ m² × 7850 = 0.888 kg/m. The d² ÷ 162 rule gives 144 ÷ 162 = 0.889 kg/m.
How much 12 mm rebar is needed per square metre at 150 mm spacing?
One layer at 150 mm centres needs 5.92 kg/m² in one direction, 11.84 kg/m² for bars both ways, plus laps.
Other bar sizes
6 mm rebar · 8 mm rebar · 10 mm rebar · 14 mm rebar · 16 mm rebar · 20 mm rebar · 25 mm rebar · 28 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).