Rebar Weight Chart: lb/ft and kg/m for #3 to #18
ASTM A615 nominal weights, plus Canadian metric and project estimating
Written by M., a general contractor in Richmond, VA · Last updated
A #4 bar weighs 0.668 lb/ft. A #5 bar weighs 1.043 lb/ft. A standard 20-foot stick of #4 weighs 13.4 lb; a 20-foot stick of #5 weighs 20.9 lb.
These are the nominal weights in ASTM A615/A615M, the U.S. standard for deformed carbon-steel reinforcing bars; the same figures appear in Caltrans' ASTM standard reinforcing bar table (see Sources). Weight is set by the nominal diameter alone, so it does not change with grade.
ASTM A615 Rebar Weight Chart (#3 to #18)
Bar size numbers correspond to the diameter in eighths of an inch. A #4 bar is 4/8 = 0.500 in, a #8 bar is 8/8 = 1.000 in. Diameters, areas and soft-metric labels for every bar are on the rebar size chart. The system breaks above #11: there is no #12 or #13, then #14 and #18 are added for heavy structural work.
| Bar Size | Diameter (in) | Diameter (mm) | Weight (lb/ft) | Weight (kg/m) | Area (in²) |
|---|---|---|---|---|---|
| #3 | 0.375 | 9.5 | 0.376 | 0.560 | 0.11 |
| #4 | 0.500 | 12.7 | 0.668 | 0.994 | 0.20 |
| #5 | 0.625 | 15.9 | 1.043 | 1.552 | 0.31 |
| #6 | 0.750 | 19.1 | 1.502 | 2.235 | 0.44 |
| #7 | 0.875 | 22.2 | 2.044 | 3.042 | 0.60 |
| #8 | 1.000 | 25.4 | 2.670 | 3.973 | 0.79 |
| #9 | 1.128 | 28.7 | 3.400 | 5.060 | 1.00 |
| #10 | 1.270 | 32.3 | 4.303 | 6.404 | 1.27 |
| #11 | 1.410 | 35.8 | 5.313 | 7.907 | 1.56 |
| #14 | 1.693 | 43.0 | 7.650 | 11.380 | 2.25 |
| #18 | 2.257 | 57.3 | 13.600 | 20.240 | 4.00 |
Values are nominal per ASTM A615/A615M-22. Actual mill-run weight may vary by up to 6% under the standard tolerance. For takeoff and ordering, use the nominal values above; the supplier reconciles tolerance at delivery.
Weight Per Stick (20 ft and 60 ft)
Rebar is stocked in 20-foot lengths at most yards; #5 and larger are also rolled in 30, 40, and 60-foot lengths from mills. Cut-to-length orders are billed by total weight, but ordering full sticks is cheaper per pound.
| Bar Size | Per 20 ft Stick (lb) | Per 40 ft Stick (lb) | Per 60 ft Stick (lb) |
|---|---|---|---|
| #3 | 7.5 | 15.0 | 22.6 |
| #4 | 13.4 | 26.7 | 40.1 |
| #5 | 20.9 | 41.7 | 62.6 |
| #6 | 30.0 | 60.1 | 90.1 |
| #7 | 40.9 | 81.8 | 122.6 |
| #8 | 53.4 | 106.8 | 160.2 |
| #9 | 68.0 | 136.0 | 204.0 |
| #10 | 86.1 | 172.1 | 258.2 |
| #11 | 106.3 | 212.5 | 318.8 |
| #14 | 153.0 | 306.0 | 459.0 |
| #18 | 272.0 | 544.0 | 816.0 |
Loading and Handling
- - A bundle of 50 sticks of #4 in 20-foot length weighs 668 lb. A standard pickup with a 1,500 lb payload can carry up to 100 sticks safely on the bed.
- - Anything #8 (1") and larger in 40+ foot length needs a flatbed delivery and equipment to unload.
- - A #18 stick at 60 feet weighs 816 lb. These are placed by crane only.
Soft Metric / Canadian Bars (CSA G30.18)
Canadian projects and some U.S. specifications use the metric bar system. The number is the nominal diameter in millimeters rounded to a whole number. CSA G30.18 governs.
| Bar | Diameter (mm) | Area (mm²) | Weight (kg/m) | Weight (lb/ft) | Closest Imperial |
|---|---|---|---|---|---|
| 10M | 11.3 | 100 | 0.785 | 0.528 | #3 |
| 15M | 16.0 | 200 | 1.570 | 1.055 | #5 |
| 20M | 19.5 | 300 | 2.355 | 1.582 | #6 |
| 25M | 25.2 | 500 | 3.925 | 2.638 | #8 |
| 30M | 29.9 | 700 | 5.495 | 3.693 | #10 |
| 35M | 35.7 | 1000 | 7.850 | 5.276 | #11 |
| 45M | 43.7 | 1500 | 11.775 | 7.913 | #14 |
| 55M | 56.4 | 2500 | 19.625 | 13.190 | #18 |
The "Closest Imperial" column shows the nearest #-bar by area, not by exact diameter. Direct substitution between metric and imperial requires a structural review when the spec calls out a specific bar.
How to Estimate Total Project Weight
Total weight equals total linear feet of bar times weight per foot. The number you multiply by is the lb/ft value from the chart above.
Formula
Total weight (lb) = Total linear ft × Weight per ft × (1 + waste %)
Use 10% waste for clean rectangular slabs, 15% for grids with many laps, 20% for cut-up work with frequent splices. The waste covers tie wire (negligible) and short cut-off pieces that go to the scrap bin.
Worked Example: 20 ft × 30 ft Slab
Slab dimensions: 20 ft wide, 30 ft long, 4-inch thick. Spec: #4 rebar on a 12-inch on-center grid.
- - Bars running the 30-foot direction: ceil(20 / 1) + 1 = 21 bars × 30 ft = 630 ft
- - Bars running the 20-foot direction: ceil(30 / 1) + 1 = 31 bars × 20 ft = 620 ft
- - Total linear ft = 630 + 620 = 1,250 ft
- - Weight = 1,250 × 0.668 = 835 lb
- - With 15% waste allowance: 835 × 1.15 = 960 lb (round to 1,000 lb)
Order 1,000 lb of #4 rebar. In 20-foot stick equivalents, that is 75 sticks (1,000 / 13.4). To run the numbers for your slab, use the rebar calculator. For total combined load (rebar plus concrete) on transport and lift planning, see the concrete weight calculator.
Grades (ASTM A615): Why Weight Doesn't Change
Grade refers to yield strength, not bar diameter. A #5 Grade 40 bar and a #5 Grade 100 bar both weigh 1.043 lb/ft. The Grade 100 bar carries 2.5× the tensile load before yielding, but its mass is identical.
| Grade | Yield Strength (ksi) | Yield Strength (MPa) | Typical Use |
|---|---|---|---|
| 40 | 40 | 276 | Legacy; limited to #3 and #4 from most suppliers today |
| 60 | 60 | 414 | Default for residential and standard commercial |
| 75 | 75 | 517 | Heavy commercial, bridges, parking structures |
| 80 | 80 | 552 | Mat foundations and shear walls (per ACI 318) |
| 100 | 100 | 690 | High-performance and seismic designs (added to A615 in 2020) |
Identify grade in the field by the longitudinal rib marking: one line for Grade 60, two lines for Grade 75, three lines for Grade 80, four for Grade 100. Bars without grade markings are Grade 40.
Coated Bar Weight Differences
Coatings add a small amount of weight. For takeoff purposes the difference is negligible, but the supplier invoice often lists the coated weight separately.
- - Epoxy-coated (ASTM A775/A934): 7–12 mil coating; ~0.5% weight increase over plain bar.
- - Hot-dip galvanized (ASTM A767): 3.4 mil minimum coating; ~0.5–1% weight increase.
- - Continuous galvanized (ASTM A1094): thinner zinc coating applied during rolling; under 0.5% weight increase.
- - Stainless steel (ASTM A955): same nominal weight as A615; sold by diameter, not by coating.
Quick Reference
- - #3: 0.376 lb/ft · 0.560 kg/m · 7.5 lb per 20-ft stick
- - #4: 0.668 lb/ft · 0.994 kg/m · 13.4 lb per 20-ft stick
- - #5: 1.043 lb/ft · 1.552 kg/m · 20.9 lb per 20-ft stick
- - #6: 1.502 lb/ft · 2.235 kg/m · 30.0 lb per 20-ft stick
- - #8: 2.670 lb/ft · 3.973 kg/m · 53.4 lb per 20-ft stick
- - Weight is set by diameter; grade does not change it.
- - Add 10–15% waste when ordering for a slab; 20% for cut-up work.
Sources
- California Department of Transportation. Bridge Design Details, Chapter 13 Reinforcement, Table 13.1.1 ASTM Standard Reinforcing Bar Data (PDF). September 2025. Diameter, area and weight for #3 to #18 match the chart above. Retrieved October 31, 2026.
- ASTM International. ASTM A615/A615M, Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement. astm.org.
Kilograms per meter are about 1.488 times the pound-per-foot weight. Per-stick weights are the pound-per-foot weight times the stick length.