Rebar Size Chart
Standard US reinforcing bar sizes with nominal diameter, weight per foot, and cross-sectional area, along with each bar's soft-metric marking. Use the calculator to total the weight of an order.
Rebar weight calculator
Total weight
133.6 lb
Metric
60.6 kg
Total length
200 ft
200 ft × 0.668 lb/ft = 133.6 lb (0.07 short tons).
US rebar sizes
| Bar size | Metric size | Diameter (in) | Diameter (mm) | Weight (lb/ft) | Weight (kg/m) | Area (in²) | Area (mm²) |
|---|---|---|---|---|---|---|---|
| #2(historic) | 6 | 0.250 | 6.3 | 0.167 | 0.249 | 0.05 | 32 |
| #3 | 10 | 0.375 | 9.5 | 0.376 | 0.560 | 0.11 | 71 |
| #4 | 13 | 0.500 | 12.7 | 0.668 | 0.994 | 0.20 | 129 |
| #5 | 16 | 0.625 | 15.9 | 1.043 | 1.552 | 0.31 | 200 |
| #6 | 19 | 0.750 | 19.0 | 1.502 | 2.235 | 0.44 | 284 |
| #7 | 22 | 0.875 | 22.2 | 2.044 | 3.042 | 0.60 | 387 |
| #8 | 25 | 1.000 | 25.4 | 2.670 | 3.973 | 0.79 | 510 |
| #9 | 29 | 1.128 | 28.7 | 3.400 | 5.060 | 1.00 | 645 |
| #10 | 32 | 1.270 | 32.3 | 4.303 | 6.404 | 1.27 | 819 |
| #11 | 36 | 1.410 | 35.8 | 5.313 | 7.907 | 1.56 | 1006 |
| #14 | 43 | 1.693 | 43.0 | 7.650 | 11.384 | 2.25 | 1452 |
| #18 | 57 | 2.257 | 57.3 | 13.600 | 20.239 | 4.00 | 2581 |
There are no #12, #13, #15, #16, or #17 bars. #2 is a historic size rarely stocked today.
Reading rebar callouts on plans
| Callout | Meaning |
|---|---|
| #4 @ 12 OC, T&B, EW | #4 bars 12 in on center, top and bottom faces, each way |
| (3) #4 | Three #4 bars |
| #3 ties @ 9 OC, (2) per set | #3 bars bent into ties every 9 in, two ties per set |
| #7 @ 12" EW, EF | #7 bars 12 in apart, each way, on each face |
Rebar Size Chart FAQ
How are rebar sizes numbered?
For #3 through #8, the bar number is the diameter in eighths of an inch: #4 is 4/8 = 1/2 in, #5 is 5/8 in. From #9 up, bars were made to match the area of the old square bars, so their diameters are not exact eighths (#9 has 1.00 in² of area and a 1.128 in diameter).
What does "#4 @ 12 OC" mean on a drawing?
Number 4 bars spaced 12 inches on center (center to center). Drawings often add T&B (top and bottom faces) and EW (each way, meaning both directions), e.g. "#4 @ 12 OC, T&B, EW".
How much does a 20 ft stick of #4 rebar weigh?
#4 rebar weighs 0.668 lb per foot, so a 20 ft bar is 13.36 lb. A bundle of ten 20 ft bars is about 134 lb.
What does the metric size on rebar mean?
When US bars are used on a metric project, they are called out by a soft-metric size: the nominal diameter rounded to the nearest millimeter. #4 becomes 13, #5 becomes 16, and #6 becomes 19. It is the same physical bar.
Sources
Bar dimensions and weights per ASTM A615 / A706, as tabulated in Wikipedia's “Rebar” article and cross-checked against Continental Steel's A615 listings. Each weight also matches steel at 490 lb/ft³ to within 1%.