#10 Rebar — Diameter, Weight & Area
Deformed reinforcing bar per ASTM A615 / A706
#10 rebar (also written No. 10 or number 10 bar) is 1.27" — 1.27 inches (32.26 mm) — in nominal diameter; the "10" stands for 10/8 of an inch. It weighs 4.303 pounds per foot (6.404 kg/m) with a nominal cross-section of 1.27 in² (819 mm²). A standard 20 ft bar weighs 86.1 lb, a 40 ft bar 172.1 lb.
These nominal values (per ASTM A615) are what reinforcement schedules, quotes, and delivery tickets use — the deformations are already accounted for in the nominal diameter.
Size & Weight
| Nominal diameter | 1.27 in (32.26 mm) |
| Nominal area | 1.27 in² (819 mm²) |
| Weight | 4.303 lb/ft (6.404 kg/m) |
Ordering Numbers
| 20 ft bar | 86.1 lb |
| 40 ft bar | 172.1 lb |
| Bars per US ton (20 ft) | 23 |
Frequently Asked Questions
What is the diameter of #10 rebar?
1.27", i.e. 1.27 inches or 32.26 mm — bar numbers count eighths of an inch, so #10 is nominally 10/8".
How thick is #10 rebar?
Number 10 bar is 1.27" thick (32.26 mm). That is the nominal diameter: the ribs are already included, because the nominal size is defined by mass per foot.
How much does #10 rebar weigh per foot?
4.303 lb per foot (6.404 kg/m). A 20 ft bar weighs 86.1 lb; a US ton is about 23 such bars.
What is the area of #10 rebar?
The nominal cross-section of #10 is 1.27 in² (819 mm²) — the value reinforcement schedules use when summing required steel area.
What is the metric equivalent of #10 rebar?
The closest European size is Ø32 (32 mm, 6.31 kg/m, B500 per EN 10080). Matches are approximate — when substituting, match the required steel area, not the bar count.
What grade is #10 rebar?
Grade is independent of size: ASTM A615 Grade 40, 60, or 75 (yield in ksi), with Grade 60 the US default. A706 covers weldable low-alloy bars for seismic work.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About