Rebar Weight Per Foot Calculator - ASTM A615 Weight Table 2026
Instantly calculate the exact weight of any rebar size (#2 through #18) by length and quantity. This free rebar weight per foot calculator uses ASTM A615 standard values to give you total weight in pounds and tons, plus a full material cost estimate - all in under 5 seconds.
Key Rebar Facts for USA Construction 2026
Most Common Bar
Residential slabs, footings & foundations use #4 (0.668 lb/ft) and #5 (1.043 lb/ft) in over 70% of USA projects.
2026 Rebar Price
Average USA market price for Grade 60 black rebar per pound. Epoxy-coated runs 20–30% higher depending on region and quantity.
Standard Lengths
Rebar ships in 20-ft and 40-ft sticks. Custom lengths are available. Lap splices add 5–10% to total linear footage on most projects.
Steel Density
Structural steel density used in all ASTM A615 weight calculations. Equals 7,850 kg/m³. Consistent across Grade 40, Grade 60, and Grade 75.
Who Uses This Rebar Weight Calculator?
DIY Homeowners
Planning a patio, driveway, or shed foundation? Get exact rebar weight and cost before heading to the supply yard - no guessing, no overspending.
Concrete Contractors
Estimate material weight for job bids, delivery scheduling, and truck load calculations. Covers all bar sizes from #2 through #18 in seconds.
Structural Engineers
Quickly verify rebar schedule weights, dead load contributions, and material cost budgets for residential and light commercial concrete structures.
Project Managers
Prepare accurate material takeoffs and procurement schedules. Supports multi-bar-size projects with a full weight breakdown and downloadable PDF report.
⚙ Rebar Weight Per Foot Calculator
Enter your bar size, length, and quantity below. Add up to 5 different bar sizes for a complete project estimate.
How the Rebar Weight Per Foot Calculator Works
Select Bar Size
Pick your ASTM A615 bar size from #2 through #18. The calculator shows diameter, weight per foot, and cross-sectional area for every size.
Enter Length & Quantity
Input the length of each bar and number of bars, or enter total linear footage directly. Multi-bar projects are supported with up to 5 different sizes.
Set Grade, Waste & Cost
Choose bar grade (40, 60, 75), coating type, and waste percentage. Enter your local cost per pound for an accurate material budget.
Get Full Results
Receive weight in pounds and tons, total linear footage, sticks to order, cost estimate, and a professional PDF report for your records or bid submission.
Rebar Weight Per Foot - ASTM A615 Complete Reference (2026)
Knowing the exact rebar weight per foot is critical for accurate material takeoffs, delivery scheduling, and job-site cost control. Every bar size in the USA follows the ASTM A615 standard, which specifies nominal diameter, cross-sectional area, and weight per linear foot for bars #2 through #18. This data does not change with bar grade - a #5 rebar weighs 1.043 lb/ft whether it is Grade 40 or Grade 60.
For most residential projects - driveways, patios, footings, and slabs - you will work with #3, #4, or #5 rebar. Commercial and industrial structures routinely use #6 through #11. Bridge and heavy foundation work often specifies #14 or #18. Use our concrete rebar calculator to determine how much rebar your specific slab or footing layout requires before running the weight estimate here.
ASTM A615 Rebar Weight Table - All Sizes #2 Through #18
The table below lists the exact published weight per foot values used in this calculator and recognized by every USA steel supplier and structural engineer.
| Bar Size | Diameter (in) | Diameter (mm) | Area (in²) | Weight (lb/ft) | Weight (kg/m) | Common Use |
|---|---|---|---|---|---|---|
| #2 | 0.250 (1/4") | 6.35 | 0.05 | 0.167 | 0.249 | Ties, light masonry |
| #3 | 0.375 (3/8") | 9.53 | 0.11 | 0.376 | 0.561 | Driveways, patios, light slabs |
| #4 | 0.500 (1/2") | 12.7 | 0.20 | 0.668 | 0.996 | Slabs, walls, columns |
| #5 | 0.625 (5/8") | 15.88 | 0.31 | 1.043 | 1.556 | Footings, foundations, beams |
| #6 | 0.750 (3/4") | 19.05 | 0.44 | 1.502 | 2.240 | Retaining walls, heavy slabs |
| #7 | 0.875 (7/8") | 22.23 | 0.60 | 2.044 | 3.049 | Structural beams, columns |
| #8 | 1.000 (1") | 25.40 | 0.79 | 2.670 | 3.982 | Columns, structural members |
| #9 | 1.128 (1-1/8") | 28.65 | 1.00 | 3.400 | 5.071 | Heavy columns, seismic zones |
| #10 | 1.270 (1-1/4") | 32.26 | 1.27 | 4.303 | 6.418 | Bridge piers, heavy foundations |
| #11 | 1.410 (1-3/8") | 35.81 | 1.56 | 5.313 | 7.924 | Large structural columns |
| #14 | 1.693 (1-3/4") | 43.00 | 2.25 | 7.650 | 11.410 | Industrial, bridge, heavy civil |
| #18 | 2.257 (2-1/4") | 57.30 | 4.00 | 13.600 | 20.284 | High-rise, nuclear, heavy civil |
The Rebar Weight Formula (ASTM A615)
The standard formula for calculating rebar weight per foot is: Weight (lb/ft) = (Bar Number)² ÷ 24. For example, #5 rebar: 5² ÷ 24 = 1.042 lb/ft (rounds to 1.043 as published). This formula works because the bar number is the diameter in eighths of an inch, and steel density is 490 lb/ft³. For total project weight, multiply weight per foot by total linear footage, then add your waste factor.
When planning any reinforced concrete project, use this weight data alongside our rebar spacing calculator and rebar cover calculator to build an accurate rebar schedule before ordering materials.
Waste Factor and Lap Splices
Always add 5–10% to your calculated linear footage before ordering. This accounts for lap splices (typically 40-bar-diameter minimum per ACI 318), cut waste at corners and ends, and any damaged bars. A simple rectangular slab needs about 5% extra; complex shapes with multiple cutoffs need 10–15%. For projects where structural integrity is critical, review your concrete PSI strength requirements alongside your rebar schedule.
💡 Pro Tip: Ordering by the Stick
Rebar ships in 20-ft and 40-ft sticks. Always round your total linear footage up to the nearest full stick length to avoid running short on the job site. Our calculator shows exactly how many full sticks to order based on your chosen stock length and waste factor.
⚠ Important: Metric vs. Imperial Bar Numbers
Do not confuse US bar numbers (#4, #5) with metric bar sizes (12mm, 16mm). A US #4 bar is NOT the same as a 4mm bar. In the US, #4 = 1/2 inch diameter. If you are importing rebar or working on a metric-spec project, verify the exact diameter before using this weight table. See the "soft metric" column above for the conversion.
Rebar Weight and Structural Dead Load
The weight of embedded rebar contributes to the structural dead load of a concrete element. For most residential slabs and footings, this contribution is modest - a 20x20-ft slab with #4 at 12-inch spacing weighs roughly 280 lbs of rebar versus 18,000 lbs of concrete. However, on large commercial slabs or heavily-reinforced elements, rebar dead load becomes significant. Engineers use our slab load calculator and concrete load bearing calculator to account for this in structural design.
Real Construction Project Rebar Weight Examples
🏠 Residential Patio Slab (20 x 20 ft)
Bar Size: #4 (0.668 lb/ft)
Spacing: 18 inches on-center each way
Total LF: ~560 linear feet
+ 10% Waste: 616 linear feet
Sticks Needed: 31 x 20-ft bars
Est. Material Cost: $225–$310
A standard 20x20 patio is a good starting point for #4 rebar at 18-inch spacing. For a concrete footing calculator, combine this with your footing dimensions.
🏭 Garage Foundation Perimeter Footing (100 LF)
Bar Size: #5 (1.043 lb/ft)
Bars: 2 continuous longitudinal bars
Total LF: ~200 linear feet
+ 10% Lap: 220 linear feet
Sticks Needed: 11 x 20-ft bars
Est. Material Cost: $127–$173
#5 is the go-to bar for residential footings under most USA building codes. See our concrete foundation calculator for the full footing volume and material estimate.
🏛 Commercial Column Grid (15 Columns)
Bar Size: #8 (2.670 lb/ft)
Bars per Column: 8 vertical bars x 12 ft
Total LF: 1,440 linear feet
+ 10% Waste: 1,584 linear feet
Sticks Needed: 80 x 20-ft bars
Est. Material Cost: $2,326–$3,171
#8 bars are standard for 12-inch-diameter columns in light commercial construction. Use our concrete column calculator alongside this tool to finalize your material order.
Frequently Asked Questions - Rebar Weight Per Foot
How much does #4 rebar weigh per foot?
#4 rebar weighs exactly 0.668 lbs per linear foot per ASTM A615. A standard 20-foot stick weighs 13.36 lbs. A bundle of 200 sticks (4,000 LF) weighs approximately 2,672 lbs. #4 is the most common bar used in residential slabs, walls, and light structural work across the USA.
What does #5 rebar weigh per foot?
#5 rebar weighs 1.043 lbs per linear foot per ASTM A615. This is the standard bar for residential footings and foundations in most US building codes. A 40-foot stick weighs 41.72 lbs. You can also pair this with our rebar spacing calculator to get the full quantity needed for your layout.
Does rebar grade (Grade 40 vs Grade 60) affect the weight per foot?
No. Bar grade refers to yield strength only - Grade 40 means 40,000 PSI yield, Grade 60 means 60,000 PSI yield. The weight per foot is identical for both grades at the same bar size. A #5 Grade 40 bar and a #5 Grade 60 bar both weigh 1.043 lb/ft. Grade 60 is the USA default for structural work.
How many pounds of rebar are in a ton?
One US short ton equals 2,000 lbs. At 0.668 lb/ft, a ton of #4 rebar covers approximately 2,994 linear feet. At 1.043 lb/ft, a ton of #5 rebar covers 1,917 linear feet. Steel suppliers often price rebar by the ton, so converting your linear footage to weight in tons is important for procurement and delivery planning.
What is the formula to calculate rebar weight?
The ASTM formula is: Weight (lb/ft) = (Bar Number)² ÷ 24. For total project weight: Total Weight = Weight per Foot × Total Linear Feet × (1 + Waste Factor). Example: 500 LF of #5 rebar with 10% waste = 500 × 1.043 × 1.10 = 573.65 lbs. This calculator handles all of that automatically.
How much does rebar cost per pound in 2026?
Grade 60 black rebar costs approximately $0.55–$0.75 per pound in 2026, depending on your region and quantity. Epoxy-coated rebar (ASTM A775) runs 20–30% more. Prices fluctuate with steel market conditions. Always get a current quote from your local rebar supplier or steel service center before finalizing your budget.
How much lap splice should I add to my rebar length calculation?
Per ACI 318, the minimum Class A lap splice is 40 bar diameters (40d). For #4 rebar (0.5-inch dia), that is 20 inches. For #5 (0.625-inch dia), it is 25 inches minimum. In practice, most contractors add 10% to total linear footage to cover both lap splices and cut waste. For complex shapes with many cuts, use 15%.
Can this calculator handle multiple bar sizes in one project?
Yes. In the Advanced Options panel, you can add up to 4 additional bar sizes. This is useful for projects like concrete beams that use #5 main bars and #3 stirrups, or foundations that combine #5 longitudinal bars with #4 transverse bars. The calculator returns a combined total weight and cost for all bar entries. For full structural design, also see our concrete beam calculator.
Data Sources and Accuracy
📅 Last Updated:
- Rebar weight tables: ASTM A615/A615M - Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement
- Bar sizes and dimensions: CRSI (Concrete Reinforcing Steel Institute) - Rebar Design Manual 2025
- Lap splice requirements: ACI 318-19 - Building Code Requirements for Structural Concrete
- Material cost benchmarks: NRMCA (National Ready Mixed Concrete Association) and regional steel supplier surveys, Q1 2026
- Labor rates: Bureau of Labor Statistics (BLS), Occupational Employment Survey, 2025
- Building code references: IBC (International Building Code) 2024
Disclaimer: All results are estimates for planning and budgeting purposes only. Material weights match ASTM A615 published values exactly. Cost estimates reflect 2026 USA market averages and will vary by region and supplier. Always verify quantities and costs with your local steel supplier before ordering. This calculator does not replace professional engineering review for structural applications.
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