#8 Rebar
One inch even: #8 is the round number of US reinforcing and the standard column and mat bar of mid rise work.
1 inch diameter, 0.79 in2, 2.670 lb per foot
| Nominal diameter | 1.000 in (25.4 mm) |
| Cross section area | 0.79 in2 (510 mm2) |
| Weight | 2.670 lb per foot (3.973 kg per meter) |
| Typical grade | Grade 60, 60 ksi yield |
| Soft metric name | No. 25 |
| 20 ft stock bar | about 53 lb |
| Nearest Canadian bar | 25M |
Notes for design and site
Column verticals, transfer elements and thick foundation mats are its home. At 0.79 in2 apiece the counts stay manageable in members that would drown in #5, and the inch even diameter makes it the bar everyone uses for mental checks of cover, spacing and hook sizes.
A 40 diameter rough lap is 40 inches, and at that length lapped column verticals start costing real steel and pour access, which is why mechanical couplers become common at #8 and above. A 20 ft bar is 53 pounds: two people or equipment.
Related Calculators and Reference
- Development Length and Lap Splice Calculator: lap versus coupler starts here.
- Rebar Cutting List Calculator: schedules that keep 53 lb bars from being cut twice.
- Quantity Takeoff Calculator: tonnage for the whole element.
- #9 Rebar: the square inch bar one step up.
- 25M Rebar: the Canadian counterpart.
- Concrete Reinforcing Steel Institute: the US industry body for reinforcing steel.