#18 rebar weight
13.600 lb/ft · 20.239 kg/m
#18 rebar has a nominal diameter of 57.3 mm (2.257 in) and a cross-sectional area of 2579 mm².
#18 rebar weight calculator
Weight of standard bar lengths
| Bars | 20 ft (lb) | 40 ft (lb) | 60 ft (lb) |
|---|---|---|---|
| 1 | 272.0 | 544.0 | 816.0 |
| 10 | 2,720.0 | 5,440.0 | 8,160.0 |
| 50 | 13,600.0 | 27,200.0 | 40,800.0 |
| 100 | 27,200.0 | 54,400.0 | 81,600.0 |
Bars per ton
| Bar length | Bars per short ton (2000 lb) |
|---|---|
| 20 ft | 7.4 |
| 40 ft | 3.7 |
| 60 ft | 2.5 |
One short ton of #18 rebar is 147 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 × 57.3² = 2,578.7 mm². Weight per metre = area × 7850 kg/m³ = 2,578.7 × 10⁻⁶ m² × 7850 = 20.243 kg/m. In US units: 2.257² × 2.67 = 13.616 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.
#18 rebar per square foot of slab
Weight of #18 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 | 40.80 | 81.60 |
| 6 in | 27.20 | 54.40 |
| 8 in | 20.40 | 40.80 |
| 10 in | 16.32 | 32.64 |
| 12 in | 13.60 | 27.20 |
| 18 in | 9.07 | 18.13 |
Compared with nearby sizes
Bars this heavy are used in heavily loaded columns, transfer beams, piles, bridge decks and large foundations. The nearest metric bar is 50 mm rebar (50 mm, 15.400 kg/m); in soft metric sizes #18 rebar is called No.57.
Frequently asked questions
What is the weight of #18 rebar per foot?
#18 rebar weighs 13.600 lb/ft (20.239 kg/m).
How much does a 20 ft bar of #18 rebar weigh?
272.0 lb (13.600 lb/ft × 20 ft). A 40 ft bar weighs 544.0 lb.
How many 20 ft bars of #18 rebar are in a ton?
About 7 bars per short ton (2000 lb), or 147 ft per short ton.
What is the metric equivalent of #18 rebar?
The nearest metric bar is 50 mm rebar (50 mm, 15.400 kg/m). In soft metric designation #18 rebar is also called No.57; it is the same bar. Check the steel area in the design before substituting one for the other.
How is the weight of #18 rebar calculated?
Area = π ÷ 4 × 57.3² = 2,578.7 mm². Weight per metre = area × 7850 kg/m³ = 2,578.7 × 10⁻⁶ m² × 7850 = 20.243 kg/m. In US units: 2.257² × 2.67 = 13.616 lb/ft.
How much #18 rebar is needed per square foot at 12 in spacing?
One layer at 12 in centres needs 13.600 lb/ft² in one direction, 27.200 lb/ft² for bars both ways, plus laps.
Other bar sizes
#3 rebar · #4 rebar · #5 rebar · #6 rebar · #7 rebar · #8 rebar · #9 rebar · #10 rebar · #11 rebar · #14 rebar
Full rebar weight chart · Steel weight calculator
Data adapted from Wikipedia, "Rebar" (CC BY-SA 4.0).