Rebar Weight Calculator
* Weights based on ASTM A615/A706 standards. Actual weights may vary slightly by manufacturer.
Disclaimer: Estimates are for budgeting purposes only. Actual costs vary by location, contractor, material availability, and project complexity. Always get professional quotes for exact pricing.
Standard Rebar Weights (ASTM A615/A706)
| Size | Diameter | Weight / Foot | Weight / 20 ft |
|---|---|---|---|
| #3 | 3/8" | 0.376 lbs | 7.5 lbs |
| #4 | 1/2" | 0.668 lbs | 13.4 lbs |
| #5 | 5/8" | 1.043 lbs | 20.9 lbs |
| #6 | 3/4" | 1.502 lbs | 30.0 lbs |
| #7 | 7/8" | 2.044 lbs | 40.9 lbs |
| #8 | 1" | 2.67 lbs | 53.4 lbs |
| #9 | 1-1/8" | 3.4 lbs | 68.0 lbs |
| #10 | 1-1/4" | 4.303 lbs | 86.1 lbs |
| #11 | 1-3/8" | 5.313 lbs | 106.3 lbs |
* Weights per ASTM A615 and A706 specifications for bare (uncoated) steel rebar.
How We Calculate
Our rebar weight calculator uses ASTM A615/A706 standard weights to estimate total weight based on rebar size, length, and quantity. The formula is: total weight = quantity × length (ft) × weight per foot.
How the math works: Weight per piece = length × weight/ft. Total weight = weight per piece × quantity. The weight per foot values are from ASTM specifications and represent standard steel reinforcement bar densities.
Standard Rebar Weights
All calculations use ASTM A615 (carbon steel) and A706 (low-alloy steel) standards. These specifications define precise weight tolerances. Weights shown are for bare (uncoated) rebar. Epoxy-coated or galvanized rebar adds less than 1% additional weight.
Common Applications
Slabs & Driveways: #3 or #4 rebar spaced 12–18 inches on center. Typical 20×20 ft slab uses 30–40 pieces of 20-foot rebar.
Foundations: #4 or #5 rebar for footings, #5 or #6 for foundation walls. A typical residential foundation uses 200–400 linear feet of rebar.
Columns & Beams: #6 to #10 depending on load. Structural members require engineering calculations for proper sizing and quantity.
Transportation Planning
Standard rebar comes in 20-foot lengths (also available in 40- and 60-foot for commercial). Calculate total weight to determine vehicle requirements. Pickup trucks (1,500 lb capacity) handle 50–100 pieces of #4 rebar. Larger loads require flatbed trailers. Always secure loads with heavy-duty straps rated for steel.
Data Sources
Weight data from ASTM A615/A706 specifications, Concrete Reinforcing Steel Institute (CRSI), and steel manufacturers. We review and update this data regularly.
Last updated: 2026-02-09
Frequently Asked Questions
How much does rebar weigh? +
Rebar weight varies by size. Common sizes: #3 (3/8") weighs 0.376 lbs/ft, #4 (1/2") weighs 0.668 lbs/ft, #5 (5/8") weighs 1.043 lbs/ft, #6 (3/4") weighs 1.502 lbs/ft, and #8 (1") weighs 2.67 lbs/ft. A 20-foot piece of #4 rebar weighs about 13.4 lbs.
What do rebar numbers mean? +
Rebar numbers (#3, #4, #5, etc.) indicate the bar diameter in eighths of an inch. #4 = 4/8" = 1/2" diameter, #5 = 5/8" diameter, #6 = 3/4" diameter. The number directly tells you the nominal diameter. This sizing system is standard in the US per ASTM specifications.
What size rebar is most common? +
#4 (1/2") and #5 (5/8") are most common for residential concrete work. #4 is standard for driveways, sidewalks, and light slabs. #5 is used for foundations, structural slabs, and footings. #6 and larger are for heavy structural applications, beams, and commercial construction.
How do I calculate rebar weight for shipping? +
Multiply rebar pieces by length to get total linear feet, then multiply by weight per foot for your rebar size. Example: 50 pieces of 20-foot #4 rebar = 1,000 ft × 0.668 lbs/ft = 668 lbs total. Add 10% for bundling straps. Knowing total weight helps estimate shipping costs and crane capacity.
Can I cut rebar to reduce weight? +
Yes, rebar is commonly sold in 20-foot lengths but can be cut to size with an angle grinder, reciprocating saw with metal blade, or bolt cutters (up to #5). Cutting reduces material waste and weight for transport. Most suppliers offer cutting services for a fee ($1–$3 per cut).
How much rebar fits in a pickup truck? +
A standard pickup (1,500 lb capacity) can carry about 100–120 pieces of 20-foot #4 rebar (1,340 lbs), or 50–60 pieces of #5 (1,043–1,252 lbs). Always secure rebar with straps and use a red flag if extending beyond the tailgate. Check your truck's payload rating before loading.
Does epoxy-coated rebar weigh more? +
Epoxy-coated rebar weighs approximately the same as bare rebar — the coating adds less than 1% to total weight. The coating thickness is 7–12 mils (0.007"–0.012"), which is negligible. Epoxy coating prevents corrosion in harsh environments but doesn't significantly affect handling or shipping weight calculations.
What is the weight difference between Grade 40 and Grade 60 rebar? +
Grade 40 and Grade 60 rebar have identical weights — the grade refers to tensile strength (40,000 vs 60,000 psi), not physical dimensions. A #4 Grade 60 bar weighs the same as a #4 Grade 40 bar (0.668 lbs/ft). Grade 60 is stronger and more commonly specified in modern construction.
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