#7 Rebar — Diameter, Weight & Area
Deformed reinforcing bar per ASTM A615 / A706
#7 rebar (also written No. 7 or number 7 bar) is 7/8" — 0.875 inches (22.23 mm) — in nominal diameter; the "7" stands for 7/8 of an inch. It weighs 2.044 pounds per foot (3.042 kg/m) with a nominal cross-section of 0.6 in² (387 mm²). A standard 20 ft bar weighs 40.9 lb, a 40 ft bar 81.8 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 | 0.875 in (22.23 mm) |
| Nominal area | 0.6 in² (387 mm²) |
| Weight | 2.044 lb/ft (3.042 kg/m) |
Ordering Numbers
| 20 ft bar | 40.9 lb |
| 40 ft bar | 81.8 lb |
| Bars per US ton (20 ft) | 48 |
Frequently Asked Questions
What is the diameter of #7 rebar?
7/8", i.e. 0.875 inches or 22.23 mm — bar numbers count eighths of an inch, so #7 is nominally 7/8".
How thick is #7 rebar?
Number 7 bar is 7/8" thick (22.23 mm). That is the nominal diameter: the ribs are already included, because the nominal size is defined by mass per foot.
How much does #7 rebar weigh per foot?
2.044 lb per foot (3.042 kg/m). A 20 ft bar weighs 40.9 lb; a US ton is about 48 such bars.
What is the area of #7 rebar?
The nominal cross-section of #7 is 0.6 in² (387 mm²) — the value reinforcement schedules use when summing required steel area.
What is the metric equivalent of #7 rebar?
The closest European size is Ø20 (20 mm, 2.47 kg/m, B500 per EN 10080). Matches are approximate — when substituting, match the required steel area, not the bar count.
What grade is #7 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