12 pieces of #4 x 20 ft
- Adjusted length
- 264 ft
- Weight per foot
- 0.668 lb/ft
- US tons
- 0.088176 tons
Nominal weights are planning values. Mill tolerances, coatings, bundles, laps, chairs, and structural design can change the final order.
Rebar Weight Calculator
Estimate rebar pounds, US tons, adjusted length, and weight per foot for common US rebar sizes from #3 through #8.
Inputs explainedResult checksExample valuesRuns in your browser
Formula steps
- Multiply length per bar by quantity.
- Add waste for cuts and laps.
- Multiply adjusted length by the nominal weight per foot for the selected bar size.
Examples
Recent answers
Recent rebar weight estimates will appear here.
Rebar weight estimates stay local. This is ordering and hauling math, not reinforcement design.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Rebar Weight Calculator
- Choose rebar size, then enter length per bar, quantity, and waste percent.
- Press Estimate weight to see adjusted length, nominal weight per foot, pounds, and US tons.
- For example, #4 rebar is commonly estimated at about 0.668 pounds per foot.
- Weight helps with ordering and hauling, but bar size, spacing, laps, and cover need proper design.
What people use it for
Estimate rebar weight for pickup or delivery planning.
Compare #3, #4, #5, and larger bars.
Add waste for cut lists and lap planning.
Convert total pounds to US tons.
Check a supplier list against a quick weight-per-foot chart.
Quick examples
#4 slab bars
12 bars, 20 ft each, 10% waste176.352 lb
#5 footing bars
8 bars, 30 ft each, 8% waste270.346 lb
#3 light grid
20 bars, 10 ft each, no waste75.2 lb
#6 heavy bars
6 bars, 40 ft each, 5% waste378.504 lb, about 0.189 tons
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Rebar Weight CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Home & ProjectsBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Rebar Weight Calculator?
Use it when your task matches one of these common needs: Estimate rebar weight for pickup or delivery planning. Compare #3, #4, #5, and larger bars. It works best when you already know the measurements, amounts, units, or options the page asks for.
What is the Rebar Weight Calculator doing with my inputs?
In plain language: The calculator multiplies length per bar by quantity, adds the waste percent, uses the nominal weight per foot for the selected rebar size, and divides total pounds by 2,000 for US tons. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.
What do the main Rebar Weight Calculator inputs mean?
Rebar size: the US bar size, such as #4 or #5, used to choose nominal weight per foot. Length per bar: the length of one straight bar, stock bar, or cut piece in feet. Quantity: how many matching bars or pieces at that length. Waste percent: extra length for cuts, lap splices, layout changes, bent pieces, and damaged bars.
How should I read the Rebar Weight Calculator answer?
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
What should I double-check before trusting the answer?
This is ordering and hauling math only. Nominal weights are planning values, and mill tolerances, coatings, cut lists, lap splices, chairs, bundle rules, bar spacing, concrete cover, inspections, and structural design can change the real order. Also check the unit, scale, mode, and result limit because small input changes can change the answer.
What does #4 rebar mean?
#4 is a common US rebar size with a nominal diameter of 1/2 inch and a planning weight of about 0.668 lb per foot.
How much does #5 rebar weigh per foot?
#5 rebar weighs about 1.043 lb per foot. For example, eight 30-foot #5 bars with 8% waste come out to about 270.35 lb.
How do I calculate total rebar weight?
Multiply length per bar by quantity, add waste, then multiply by the weight per foot for the bar size. The calculator also divides pounds by 2,000 to show US tons.
Does this work as a rebar weight chart?
Yes. The rebar size menu shows the weight per foot for #3, #4, #5, #6, #7, and #8 bars. Use the calculator when you also know length and quantity.
Can I use this for a concrete slab?
Yes, if you already know the bar size, bar length, and quantity. Use the separate Rebar Calculator first if you still need a slab grid count from spacing.
Why does waste matter for rebar weight?
Waste covers cutoffs, overlaps, lap splices, bent bars, layout changes, and damaged pieces. A neat cut list may need little waste; a messy layout needs more.
Does this include lap splice design?
No. It can add a waste allowance for laps, but lap length itself depends on bar size, concrete strength, grade, spacing, cover, and the project drawings.
Can this estimate delivery or hauling weight?
It gives a good planning weight in pounds and US tons. Check supplier bundle counts, coatings, mill tolerances, and truck or trailer limits before hauling.
Does epoxy-coated rebar weigh the same?
The steel weight is based on nominal bar size. Coatings, tags, bundling, and supplier packaging can add small differences to the delivered weight.
Is rebar weight the same as rebar design?
No. Weight helps with ordering and hauling. Bar size, spacing, lap length, cover, support chairs, placement, and inspections still need project-specific design.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.