#3 Rebar
The smallest standard US bar and the one bent most often: stirrups, ties and light slab steel are #3 work.
3/8 inch diameter, 0.11 in2, 0.376 lb per foot
| Nominal diameter | 3/8 in (9.5 mm) |
| Cross section area | 0.11 in2 (71 mm2) |
| Weight | 0.376 lb per foot (0.560 kg per meter) |
| Typical grade | Grade 60, 60 ksi yield |
| Soft metric name | No. 10 |
| 20 ft stock bar | about 7.5 lb |
| Nearest Canadian bar | 10M |
Notes for design and site
#3 rarely resists bending moments directly; it confines and positions the bars that do. Beam stirrups, column ties and crack control steel in residential slabs make up most of its life, and at under 8 pounds per 20 ft stick it is the one bar a single worker bends and places all day without thinking about it.
Hooks matter more than laps at this size, since stirrups anchor around longitudinal bars, but for the record a 40 diameter rough lap is about 15 inches. On metric drawings the same bar appears as No. 10, which trips people up because Canada has a different, slightly larger bar called 10M.
Related Calculators and Reference
- Shear and Stirrup Spacing Calculator: the calculation #3 exists to satisfy.
- Rebar Cutting List Calculator: hooks and bends, scheduled properly.
- Rebar Weight and Spacing Calculator: runs to pounds and kilograms.
- #4 Rebar: one step up, into slab and wall work.
- Grade 60 Rebar: the strength side of the standard US bar.
- Concrete Reinforcing Steel Institute: the US industry body for reinforcing steel.