Metal · Rebar
Rebar size and weight chart
A rebar's number is its diameter in eighths of an inch: #4 is 4/8 = ½ inch and weighs 0.668 lb per foot (0.994 kg/m), so a 20 ft bar weighs 13.4 lb and a 40 ft bar 26.7 lb. From #9 up the sizes follow the area instead (#9 is 1 in² of steel). The chart gives every standard size with its soft metric name, the diameter, the area and the weight per foot, per metre and per bar.
Standard rebar sizes, ASTM A615 / A706
| Bar size | Metric size | Diameter, in | Diameter, mm | Area, in² | lb/ft | kg/m | 20 ft bar, lb | 40 ft bar, lb |
|---|---|---|---|---|---|---|---|---|
| #3 | #10 | 0.375 | 9.5 | 0.11 | 0.376 | 0.560 | 7.5 | 15.0 |
| #4 | #13 | 0.500 | 12.7 | 0.20 | 0.668 | 0.994 | 13.4 | 26.7 |
| #5 | #16 | 0.625 | 15.9 | 0.31 | 1.043 | 1.552 | 20.9 | 41.7 |
| #6 | #19 | 0.750 | 19.0 | 0.44 | 1.502 | 2.235 | 30.0 | 60.1 |
| #7 | #22 | 0.875 | 22.2 | 0.60 | 2.044 | 3.042 | 40.9 | 81.8 |
| #8 | #25 | 1.000 | 25.4 | 0.79 | 2.670 | 3.973 | 53.4 | 106.8 |
| #9 | #29 | 1.128 | 28.7 | 1.00 | 3.400 | 5.060 | 68.0 | 136.0 |
| #10 | #32 | 1.270 | 32.3 | 1.27 | 4.303 | 6.404 | 86.1 | 172.1 |
| #11 | #36 | 1.410 | 35.8 | 1.56 | 5.313 | 7.907 | 106.3 | 212.5 |
| #14 | #43 | 1.693 | 43.0 | 2.25 | 7.650 | 11.384 | 153.0 | 306.0 |
| #18 | #57 | 2.257 | 57.3 | 4.00 | 13.600 | 20.239 | 272.0 | 544.0 |
Nominal values of ASTM A615 (the same sizes and weights in A706 and A996): the diameter, area and weight are those of a plain round bar of the same weight per foot, since the ribs make the real outline larger. kg/m = lb/ft × 1.48816; the metric size is the soft metric designation stamped on bars made in metric (#13 for #4). The permitted variation in weight is 6 % under nominal for a single bar. For metric bars sold by diameter (B500, TMT, 8 to 32 mm), see the steel round bar and rebar chart.
Questions people ask
- How much does #4 rebar weigh per foot?
- 0.668 lb per foot, 0.994 kg per metre. A 20 ft bar weighs 13.4 lb and a 40 ft bar 26.7 lb. #4 is ½ inch (12.7 mm) in diameter, metric size #13.
- What size is #5 rebar?
- 5/8 inch, 15.9 mm, with an area of 0.31 in². It weighs 1.043 lb per foot (1.552 kg/m); its metric name is #16.
- How do you calculate rebar weight?
- Multiply the weight per foot from the chart by the length: 120 ft of #5 is 120 × 1.043 = 125 lb. For a bar not in the chart, area (in²) × 3.4 gives lb/ft, because steel weighs 3.4 lb per foot for each square inch of section.