Free Rebar Cost Calculator – Estimate Material Costs
Rebar is priced by weight, not by the bar, so the true cost of a job hides inside a weight chart: bar size, total length, waste, labor, delivery, and cutting all stack up. This calculator handles multiple bar sizes in one estimate, works in imperial or metric units, and accepts the price per ton, pound, kilogram, foot, or meter.
Enter each bar size as its own line, add your waste allowance and crew costs, and press Calculate. The tool converts every line to weight using the standard rebar chart, adds waste before costing, then layers labor, delivery, and cutting on top for a total project cost with per-bar and per-pound readouts.
Multi-size estimates in imperial or metric, with waste, labor, delivery, and cutting.
Quick Answer
80 bars of #5 rebar at 20 feet each is 1,600 feet, or 1,668.8 lbs at 1.043 lb per foot. A 10% waste allowance brings it to 1,835.7 lbs (0.918 tons), so material at $800 per ton costs $734.27. Add 8 hours of labor at $45 ($360) and $120 delivery for a total project cost of $1,214.27, about $15.18 per bar.
How to use the rebar cost calculator
Set the unit system and entry mode, fill in one line per bar size, add your price and crew costs, then press Calculate. Results stay hidden until you run a calculation.
Start with the two dropdowns. Unit system switches the whole tool between imperial (feet, pounds, short tons of 2,000 lb) and metric (meters, kilograms, tonnes of 1,000 kg). Entry mode chooses how you describe each line: Bars mode takes the length per bar and the number of bars, the way contractors actually order, while Length mode takes the total length per bar size directly. Changing either dropdown rebuilds the line items, so set them first.
Each line needs a bar size (#3 through #11, picked from the standard chart), a length, and a bar count in bars mode. Press Add another bar size for mixed jobs, such as #5 for a footing with #4 stirrups. Then enter the rebar price with its basis (per ton, pound, foot, tonne, kilogram, or meter), a waste allowance, installation hours with the crew rate, delivery, and any cutting and bending charges. If your supplier quotes per bar rather than by weight, run the numbers and compare the tool’s cost-per-pound readout against the weight price; the per-bar quote often hides a markup.
The standard rebar weight chart
Every estimate on this page starts from weight, and the weights are not estimates: they are the nominal values from ASTM A615, the standard specification for deformed carbon-steel bars for concrete reinforcement. The tool multiplies each line’s length by its size’s weight per foot (or per meter in metric mode).
| Bar size | Diameter | Weight (lb/ft) | Weight (kg/m) |
|---|---|---|---|
| #3 | 3/8 in (9.5 mm) | 0.376 | 0.560 |
| #4 | 1/2 in (12.7 mm) | 0.668 | 0.994 |
| #5 | 5/8 in (15.9 mm) | 1.043 | 1.552 |
| #6 | 3/4 in (19.1 mm) | 1.502 | 2.235 |
| #7 | 7/8 in (22.2 mm) | 2.044 | 3.042 |
| #8 | 1 in (25.4 mm) | 2.670 | 3.973 |
| #9 | 1-1/8 in (28.7 mm) | 3.400 | 5.060 |
| #10 | 1-1/4 in (32.3 mm) | 4.303 | 6.404 |
| #11 | 1-3/8 in (35.8 mm) | 5.313 | 7.907 |
Bar numbers #3 through #8 are eighths of an inch of diameter (#4 is 4/8, or 1/2 inch); larger bars are sized by cross-sectional area. The metric column converts at 1.488164 kg/m per lb/ft. Keep this chart handy when a supplier quote looks off: divide any per-bar price by the bar’s weight and you have the real per-pound price to compare.
How the calculation works
Weight first, then waste, then money. The tool converts each line to weight, adds the lines, applies the waste percentage to the base weight, and only then prices the total.
Line weight = Length × Weight per foot (or per meter)
Base weight = Sum of all line weights
Total weight = Base weight × (1 + Waste % ÷ 100)
Material cost = Total weight × Price (per ton, tonne, pound, or kilogram) or Total length × Price (per foot or meter)
Total project cost = Material cost + (Hours × Labor rate) + Delivery + Cutting
Waste is added to the base weight before costing, because you pay for the steel you cut off and throw away. Labor, delivery, and cutting are added after, because they do not change with the steel weight. If your supplier quotes per pound, per kilogram, per foot, or per meter instead of per ton, the price-basis selector converts the quote to the same total without you doing the unit math.
Worked example: 80 bars of #5
A contractor needs 80 bars of #5 rebar, each 20 feet long, at $800 per ton. Labor is 8 hours at $45 per hour, plus $120 delivery. Total length is 80 × 20 = 1,600 feet. At 1.043 lb per foot, base weight is 1,600 × 1.043 = 1,668.8 lbs. A 10% waste allowance adds 166.9 lbs, giving 1,835.7 lbs, or 0.918 tons. Material cost is 0.918 × $800 = $734.27. Labor is 8 × $45 = $360, delivery $120. Total project cost: $734.27 + $360 + $120 = $1,214.27, which is $15.18 per bar and $0.66 per pound. The calculator above is pre-filled with these inputs and returns these exact figures.
What competing calculators miss
Most rebar calculators handle a single bar size, one price unit, and nothing else: no waste allowance, no labor, no delivery, no metric option. Weight-only tools tell you the tonnage but leave you to price it by hand. Installation-cost pages give per-square-foot presets for driveways and slabs but cannot handle a mixed list of bar sizes, and none of them let you enter the price the way your supplier actually quotes it.
This page keeps the whole job in one estimate. Multiple bar sizes as separate line items, an imperial/metric switch, price entry per ton, pound, kilogram, foot, or meter, a bars-count mode that matches how contractors order, and per-bar and per-pound cost readouts so two supplier quotes can be compared honestly. The breakdown under the results shows every line’s weight, the waste math, and the cost per unit, so nothing is a black box.
Buying tips that lower the real cost
Always get quotes per ton and per bar from the same supplier. The per-bar price often hides a markup over the weight price, and the calculator’s cost-per-pound readout exposes it: if their per-bar quote works out to $0.90 per pound while their per-ton price is $0.40 per pound, you are paying for convenience, not steel. Buy standard 20-foot lengths where possible; cut lengths cost more per pound.
Size the waste allowance to the job, not to habit. Straight runs with few cuts lose little, so 5% covers it; layouts with many bends, hooks, and short offcuts justify 10 to 15%, because every bend consumes bar and every offcut under a few feet is scrap. Lap splices, where bars overlap to continue a run, also eat length that never shows in the drawings.
For large jobs, ask about bundle pricing: a full bundle is typically 2 to 3 tons and the per-ton price drops noticeably at that volume. And remember that delivery is almost always billed separately, which is why the calculator keeps it as its own line item instead of burying it in the steel price. When the rebar is part of a bigger pour, estimate the concrete volume for the same job so the two material budgets line up, and check beam length runs before ordering cut bars to length. If the job’s steel specification cites a ductility figure, the reduction of area calculator explains how that percentage is measured.
Takeaways
- Rebar is bought by weight. Convert every quote to a per-pound or per-ton price before comparing suppliers.
- Add waste to the weight before costing: 5 to 10% for simple layouts, 10 to 15% for complex bends and splices.
- Price the full job, not just the steel: labor, delivery, and cutting are often a third of the total.
- Guard protruding rebar on site. OSHA requires protection against impalement wherever workers could fall onto it.
Frequently asked questions
By weight, usually per ton (2,000 lb) or per tonne (1,000 kg). Some suppliers quote per bar or per foot; convert those to a per-pound price before comparing quotes, which the calculator’s cost-per-pound readout does for you.
#4 rebar (1/2 inch diameter) weighs 0.668 lb per foot, or 0.994 kg per meter. A standard 20-foot bar weighs about 13.36 lbs.
About 150. A 20-foot #4 bar weighs 13.36 lbs, and 2,000 divided by 13.36 is roughly 149.7. The calculator prints this reference figure alongside imperial results.
Yes. Cutting and bending always produce offcuts, and lap splices consume extra length. Add 5 to 10% for simple layouts and 10 to 15% for complex ones with many bends. The calculator adds waste to the base weight before costing, since you pay for the steel you cut off.
It translates the whole project into the unit suppliers quote. If a supplier’s per-bar price is well above the calculator’s cost per bar at their own per-ton price, the difference is markup or cutting charges, and you can negotiate from a position of knowledge.
Yes. Switch the unit system to metric and enter lengths in meters with the price per tonne, per kilogram, or per meter. Weights use the standard chart converted at 1.488164 kg/m per lb/ft.
Only what you enter. Delivery is usually billed separately, so the calculator keeps delivery and cutting as their own line items added after the material cost.
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References
- ASTM International. ASTM A615/A615M-22: Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement (nominal weights table). Accessed October 23, 2026.
- McGraw-Hill Access Engineering. Steel Reinforcement Information: ASTM standard reinforcing bar sizes, weights, and dimensions. Accessed October 23, 2026.
- U.S. Navy Construction Training Manual. Reinforcing Bars: bar designation system, grades, and identification marks. Accessed October 23, 2026.
- Occupational Safety and Health Administration. Standard interpretation: guarding protruding reinforcing steel against impalement under 29 CFR 1926.701(b). April 24, 2006. Accessed October 23, 2026.
- CPWR – The Center for Construction Research and Training. Construction Solutions: capping reinforcement bars to prevent impalement. Accessed October 23, 2026.