#9 rebar weight
3.400 lb/ft · 5.060 kg/m
#9 rebar has a nominal diameter of 28.7 mm (1.128 in) and a cross-sectional area of 647 mm².
#9 rebar weight calculator
Weight of standard bar lengths
| Bars | 20 ft (lb) | 40 ft (lb) | 60 ft (lb) |
|---|---|---|---|
| 1 | 68.0 | 136.0 | 204.0 |
| 10 | 680.0 | 1,360.0 | 2,040.0 |
| 50 | 3,400.0 | 6,800.0 | 10,200.0 |
| 100 | 6,800.0 | 13,600.0 | 20,400.0 |
Bars per ton
| Bar length | Bars per short ton (2000 lb) |
|---|---|
| 20 ft | 29.4 |
| 40 ft | 14.7 |
| 60 ft | 9.8 |
One short ton of #9 rebar is 588 ft per short ton. Use this to turn a weight on a delivery note into a bar count.
How the weight is calculated
Area = π ÷ 4 × 28.7² = 646.9 mm². Weight per metre = area × 7850 kg/m³ = 646.9 × 10⁻⁶ m² × 7850 = 5.078 kg/m. In US units: 1.128² × 2.67 = 3.401 lb/ft.
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.
#9 rebar per square foot of slab
Weight of #9 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 (lb/ft²) | Both directions (lb/ft²) |
|---|---|---|
| 4 in | 10.20 | 20.40 |
| 6 in | 6.80 | 13.60 |
| 8 in | 5.10 | 10.20 |
| 10 in | 4.08 | 8.16 |
| 12 in | 3.40 | 6.80 |
| 18 in | 2.27 | 4.53 |
Compared with nearby sizes
| Bar | lb/ft | kg/m | vs this bar |
|---|---|---|---|
| #7 rebar | 2.044 | 3.042 | −40 % |
| #8 rebar | 2.670 | 3.973 | −21 % |
| #9 rebar | 3.400 | 5.060 | — |
| #10 rebar | 4.303 | 6.404 | +27 % |
| #11 rebar | 5.313 | 7.907 | +56 % |
Bars this heavy are used in heavily loaded columns, transfer beams, piles, bridge decks and large foundations. The nearest metric bar is 28 mm rebar (28 mm, 4.830 kg/m); in soft metric sizes #9 rebar is called No.29.
Frequently asked questions
What is the weight of #9 rebar per foot?
#9 rebar weighs 3.400 lb/ft (5.060 kg/m).
How much does a 20 ft bar of #9 rebar weigh?
68.0 lb (3.400 lb/ft × 20 ft). A 40 ft bar weighs 136.0 lb.
How many 20 ft bars of #9 rebar are in a ton?
About 29 bars per short ton (2000 lb), or 588 ft per short ton.
What is the metric equivalent of #9 rebar?
The nearest metric bar is 28 mm rebar (28 mm, 4.830 kg/m). In soft metric designation #9 rebar is also called No.29; it is the same bar. Check the steel area in the design before substituting one for the other.
How is the weight of #9 rebar calculated?
Area = π ÷ 4 × 28.7² = 646.9 mm². Weight per metre = area × 7850 kg/m³ = 646.9 × 10⁻⁶ m² × 7850 = 5.078 kg/m. In US units: 1.128² × 2.67 = 3.401 lb/ft.
How much #9 rebar is needed per square foot at 12 in spacing?
One layer at 12 in centres needs 3.400 lb/ft² in one direction, 6.800 lb/ft² for bars both ways, plus laps.
Other bar sizes
#3 rebar · #4 rebar · #5 rebar · #6 rebar · #7 rebar · #8 rebar · #10 rebar · #11 rebar · #14 rebar · #18 rebar
Full rebar weight chart · Steel weight calculator
Data adapted from Wikipedia, "Rebar" (CC BY-SA 4.0).