#8 rebar weight
2.670 lb/ft · 3.973 kg/m
#8 rebar has a nominal diameter of 25.4 mm (1 in) and a cross-sectional area of 507 mm².
#8 rebar weight calculator
Weight of standard bar lengths
| Bars | 20 ft (lb) | 40 ft (lb) | 60 ft (lb) |
|---|---|---|---|
| 1 | 53.4 | 106.8 | 160.2 |
| 10 | 534.0 | 1,068.0 | 1,602.0 |
| 50 | 2,670.0 | 5,340.0 | 8,010.0 |
| 100 | 5,340.0 | 10,680.0 | 16,020.0 |
Bars per ton
| Bar length | Bars per short ton (2000 lb) |
|---|---|
| 20 ft | 37.5 |
| 40 ft | 18.7 |
| 60 ft | 12.5 |
One short ton of #8 rebar is 749 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 × 25.4² = 506.7 mm². Weight per metre = area × 7850 kg/m³ = 506.7 × 10⁻⁶ m² × 7850 = 3.978 kg/m. In US units: 1.000² × 2.67 = 2.673 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.
#8 rebar per square foot of slab
Weight of #8 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 | 8.01 | 16.02 |
| 6 in | 5.34 | 10.68 |
| 8 in | 4.01 | 8.01 |
| 10 in | 3.20 | 6.41 |
| 12 in | 2.67 | 5.34 |
| 18 in | 1.78 | 3.56 |
Compared with nearby sizes
| Bar | lb/ft | kg/m | vs this bar |
|---|---|---|---|
| #6 rebar | 1.502 | 2.235 | −44 % |
| #7 rebar | 2.044 | 3.042 | −23 % |
| #8 rebar | 2.670 | 3.973 | — |
| #9 rebar | 3.400 | 5.060 | +27 % |
| #10 rebar | 4.303 | 6.404 | +61 % |
Bars this heavy are used in heavily loaded columns, transfer beams, piles, bridge decks and large foundations. The nearest metric bar is 25 mm rebar (25 mm, 3.850 kg/m); in soft metric sizes #8 rebar is called No.25.
Frequently asked questions
What is the weight of #8 rebar per foot?
#8 rebar weighs 2.670 lb/ft (3.973 kg/m).
How much does a 20 ft bar of #8 rebar weigh?
53.4 lb (2.670 lb/ft × 20 ft). A 40 ft bar weighs 106.8 lb.
How many 20 ft bars of #8 rebar are in a ton?
About 37 bars per short ton (2000 lb), or 749 ft per short ton.
What is the metric equivalent of #8 rebar?
The nearest metric bar is 25 mm rebar (25 mm, 3.850 kg/m). In soft metric designation #8 rebar is also called No.25; it is the same bar. Check the steel area in the design before substituting one for the other.
How is the weight of #8 rebar calculated?
Area = π ÷ 4 × 25.4² = 506.7 mm². Weight per metre = area × 7850 kg/m³ = 506.7 × 10⁻⁶ m² × 7850 = 3.978 kg/m. In US units: 1.000² × 2.67 = 2.673 lb/ft.
How much #8 rebar is needed per square foot at 12 in spacing?
One layer at 12 in centres needs 2.670 lb/ft² in one direction, 5.340 lb/ft² for bars both ways, plus laps.
Other bar sizes
#3 rebar · #4 rebar · #5 rebar · #6 rebar · #7 rebar · #9 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).