---
title: "Rebar Weight Chart: Pounds per Foot by Bar Size, and How Rebar Is Priced"
url: https://www.uncap.com/post/rebar-weight-chart
author: "Denis Dyli"
published: 2026-10-08
updated: 2026-10-08
summary: "Under ASTM A615 Table 1, rebar weight per foot runs from 0.376 pounds for a #3 bar to 13.60 pounds for a #18 bar, with #4 at 0.668 and #5 at 1.043. Order weight is pieces times cut length times weight per foot, and NIST Handbook 44 defines a hundredweight as 100 pounds and a ton as 2,000 pounds. Rebar is commonly priced per hundredweight or per ton, and one mill, Gerdau, announces its price changes in both units, so quotes need a validity window."
---

# Rebar Weight Chart: Pounds per Foot by Bar Size, and How Rebar Is Priced

> Under ASTM A615 Table 1, rebar weight per foot runs from 0.376 pounds for a #3 bar to 13.60 pounds for a #18 bar, with #4 at 0.668 and #5 at 1.043. Order weight is pieces times cut length times weight per foot, and NIST Handbook 44 defines a hundredweight as 100 pounds and a ton as 2,000 pounds. Rebar is commonly priced per hundredweight or per ton, and one mill, Gerdau, announces its price changes in both units, so quotes need a validity window.

A contractor calls in 120 pieces of #5 at 20 feet. Your yard pulls sticks, your quote prices pounds, and the number that connects the two is the bar's nominal weight per foot. That is the whole job of a rebar weight chart. Below is the chart for every standard ASTM A615 bar size from #3 to #18, quoted from the standard's own table, then the math from pieces to pounds to a price.

**Quick answer:** Under ASTM A615 Table 1, rebar weight per foot runs from 0.376 pounds for a #3 bar to 13.60 pounds for a #18 bar. A #4 bar weighs 0.668 pounds per foot and a #5 weighs 1.043. Total weight is pieces times length times weight per foot. Divide pounds by 100 for hundredweight and by 2,000 for tons.

## The rebar weight chart for ASTM A615 bars, #3 to #18

ASTM A615/A615M covers deformed and plain carbon-steel bars for concrete reinforcement, and its Table 1 sets the standard sizes, nominal weights and nominal dimensions for each bar designation number. The values below are quoted from that table as published in the [ASTM A615/A615M-12 listing on the ANSI Webstore](https://webstore.ansi.org/standards/astm/astma615a615m12). Each line gives the bar size, its nominal diameter, its weight per foot, then the metric mass and the A615M bar designation in brackets.

- #3 (0.375 inch): 0.376 lb per foot [0.560 kg/m, bar 10]
- #4 (0.500 inch): 0.668 lb per foot [0.994 kg/m, bar 13]
- #5 (0.625 inch): 1.043 lb per foot [1.552 kg/m, bar 16]
- #6 (0.750 inch): 1.502 lb per foot [2.235 kg/m, bar 19]
- #7 (0.875 inch): 2.044 lb per foot [3.042 kg/m, bar 22]
- #8 (1.000 inch): 2.670 lb per foot [3.973 kg/m, bar 25]
- #9 (1.128 inch): 3.400 lb per foot [5.060 kg/m, bar 29]
- #10 (1.270 inch): 4.303 lb per foot [6.404 kg/m, bar 32]
- #11 (1.410 inch): 5.313 lb per foot [7.907 kg/m, bar 36]
- #14 (1.693 inch): 7.65 lb per foot [11.38 kg/m, bar 43]
- #18 (2.257 inch): 13.60 lb per foot [20.24 kg/m, bar 57]

Notice the gaps. The table jumps from #11 to #14 and from #14 to #18, so a line that reads #12 or #16 on an order is a typo to catch before it reaches the yard.

Gerdau and Nucor, two North American rebar mills, publish the same weights for #3 through #18 on their current product pages, and both charts stop at #18. The current edition, A615/A615M-26, also includes a No. 20 bar, and ASTM warns that design codes "may not recognize the use of the No. 20 [64] bar, the largest bar included in this specification." If a job calls for one, get its weight from the producing mill.

## What does nominal mean on a rebar weight chart?

Nominal means the bar's weight and diameter are defined through an equivalent plain round bar. A deformed bar has ribs, so its real outline is not a clean circle. ASTM A615 states that the nominal dimensions of a deformed bar "are equivalent to those of a plain round bar having the same weight [mass] per foot [metre] as the deformed bar."

That is why a #9 shows 1.128 inches rather than a tidy fraction: the weight comes first and the diameter follows. The Concrete Reinforcing Steel Institute (CRSI) defines the bar number as "approximately the bar diameter in eighths of an inch," and its [reinforced concrete terminology](https://www.crsi.org/reinforcing-basics/reinforced-concrete-terminology/) gives the example that "A #5 [#16] bar is approximately 5/8 inch [16 millimeters] in diameter." The eighths rule matches the table exactly from #3 through #8. Above that it drifts: 9/8 is 1.125 inches against a nominal 1.128 for #9, and 14/8 is 1.75 inches against 1.693 for #14. For weight math, use the chart, not the rule.

Grade does not change the weight per foot. ASTM A615 gives one nominal weight per bar designation in Table 1 and sets grade separately: the current edition defines Grade 40, Grade 60, Grade 80 and Grade 100 by minimum yield strength. CRSI puts it simply: "The Grade designation is equal to the minimum yield strength of the bar in ksi." So a Grade 60 #5 and a Grade 80 #5 extend to the same pounds, but the order line still needs the grade the project specification calls for.

## How to turn rebar weight per foot into an order weight

The math behind every rebar weight per foot figure on an order is the same four steps.

- Step 1, look up the size: take the weight per foot for the bar size from the chart.
- Step 2, weigh one piece: multiply that weight by the cut length in feet.
- Step 3, weigh the line: multiply by the number of pieces.
- Step 4, total the order: add the lines for the order, or for the release that ships on one truck.

Here it is on two lines of a bar list. The first line is 120 pieces of #5 at 20 feet: 1.043 times 20 is 20.86 pounds per piece, and 120 pieces come to 2,503.2 pounds. The second is 50 pieces of #8 at 30 feet: 2.670 times 30 is 80.1 pounds per piece, and 50 pieces come to 4,005 pounds. The order totals 6,508.2 pounds of steel.

The same math answers the questions a counter hears every day. A 20 foot stick of #4 weighs 13.36 pounds, #5 weighs 20.86 pounds, and #6 weighs 30.04 pounds. Gerdau lists typical lengths of "20, 30, 40 and 60 foot," so for the longer sticks, multiply the same weight per foot by 30, 40 or 60.

For a bent bar, bending does not add or remove steel, so the piece weighs what its cut length weighs. Use the cut length on the bar list, not the out-to-out dimensions of the finished shape.

## Pounds, hundredweight and tons: the conversions

Once a line is in pounds, it can be priced by the hundredweight or the ton, as rebar often is. The definitions come from Appendix C of NIST Handbook 44, the General Tables of Units of Measurement published by the National Institute of Standards and Technology.

- Hundredweight (cwt): "100 pounds = 1 hundredweight (cwt)."
- Ton (tn): "20 hundredweights = 1 ton (tn) = 2 000 pounds."
- Long measure: a gross or long hundredweight is 112 pounds and a long ton is 2,240 pounds. NIST Handbook 44 notes these are "used commercially in the United States to only a very limited extent."
- Metric ton: 2,204.623 pounds, which is not the same as a 2,000 pound ton.

NIST also records the convention that makes trade shorthand work: "When the terms 'hundredweight' and 'ton' are used unmodified, they are commonly understood to mean the 100-pound hundredweight and the 2000-pound ton." Where a document mixes metric and US units, spell out which ton you mean.

Run the example order through those definitions. The #5 line at 2,503.2 pounds is 25.03 hundredweight, or 1.25 tons. The full order at 6,508.2 pounds is 65.08 hundredweight, or 3.25 tons. Simple math, which is why a storefront can do it on every line.

## How is rebar priced by weight?

Rebar is counted in pieces but commonly priced by weight, per hundredweight or per ton. The quote extends each line from pieces and length to pounds using the chart weight, then applies the rate for that bar. A price per hundredweight and a price per ton say the same thing, since a ton is 20 hundredweight.

Gerdau, for one, states its rebar price moves in both units at once. Its [rebar price announcement of May 5, 2026](https://www2.gerdau.com/sites/gln_gerdau/files/downloadable_files/Gerdau%20Price%20Announcement%20-%20Rebar%20-%20May%202026.pdf) raised "the transactional price of Concrete Reinforcing Bar Products in the United States by $1.50/cwt ($30 per net ton)." Twenty hundredweight at $1.50 is $30. On the 2,503 pound #5 line above, that move is about $37.55. It is a change in one mill's price, not a price to quote from. Your cost and selling rate come from your suppliers and your ERP.

The same letter shows why a rebar quote needs a date on it. Orders confirmed by the end of business on May 4 were "price protected if shipped by May 17, 2026." As our [rebar and structural steel industry page](https://www.uncap.com/industry/rebar-structural-steel) puts it, "Steel reprices with its market." A number quoted on Monday may not hold for a pour three weeks out, so a rate needs a validity window and a record of every requote.

One more decision sits on the invoice: whether it carries the calculated weight from the chart or the weight off a scale. The industry page treats that as the supplier's call. Decide once and put it in your terms.

## Putting the rebar weight chart inside an online order

Rebar needs three units on the same order line. The buyer thinks in pieces and feet, the yard pulls sticks, and the invoice bills pounds. As our industry page puts it, a storefront that only knows "each" cannot show the weight, and one that only knows weight cannot tell the yard how many sticks to pull.

On Shopify, this logic is built during implementation from your ERP data: "Converting pieces and lengths to pounds by each size's nominal weight per foot is built during implementation. The buyer enters pieces and feet and sees pounds and the extended price on the same line." Pricing per hundredweight or ton, by size and grade, is configured during implementation on top of account prices.

The quote layer is product, not build. In [Uncap Quotes](https://www.uncap.com/products/quotes), negotiated prices, tiers and volume breaks apply automatically, quotes carry validity windows and a full revision history, and approved quotes turn straight into Shopify orders. Bar list import, where the contractor uploads the list from the placing drawings instead of keying it, is built during implementation, and so are releases by pour or floor, where each release becomes its own Shopify order against one approved quote.

For other building products quoted by the job, see our field notes on [quote-to-order for construction supply](https://www.uncap.com/post/quote-to-order-construction-supply). For the wider move from phone and fax orders to a storefront, see our guide to [building materials ecommerce](https://www.uncap.com/post/building-materials-ecommerce).

Uncap has been a Shopify Platinum Partner since 2013, with 380+ storefronts launched on Shopify. If you want weight pricing, bar list import and ERP mapping written down and costed before anything is built, [Uncap Blueprint](https://www.uncap.com/blueprint) is a fixed $7,500, four-week plan credited toward implementation. Talk to Our Experts, and bring a bar list from a recent job.

## Frequently asked questions

### How much does a 20 foot piece of #5 rebar weigh?

A 20 foot piece of #5 rebar weighs 20.86 pounds at its nominal weight. ASTM A615 Table 1 lists #5 bar at 1.043 pounds per foot, and 1.043 times 20 feet is 20.86 pounds.

### How much does a 20 ft piece of number 6 rebar weigh?

A 20 foot piece of #6 rebar weighs 30.04 pounds at its nominal weight. ASTM A615 Table 1 lists #6 bar at 1.502 pounds per foot with a nominal diameter of 0.750 inch.

### How much does 1 ft of number 4 rebar weigh?

One foot of #4 rebar weighs 0.668 pounds. That is the nominal weight in ASTM A615 Table 1, where #4 has a nominal diameter of 0.500 inch and a metric mass of 0.994 kilograms per meter. A 20 foot stick of #4 weighs 13.36 pounds.

### What does #8 rebar weigh per foot?

A #8 rebar weighs 2.670 pounds per foot. ASTM A615 Table 1 gives #8 a nominal diameter of 1.000 inch and a metric mass of 3.973 kilograms per meter.

### Is #4 or #5 rebar stronger?

At the same grade, a #5 bar carries more steel than a #4 bar. ASTM A615 Table 1 gives #5 a nominal cross-sectional area of 0.31 square inch against 0.20 square inch for #4, while grade sets the minimum yield strength per square inch. Which bar a structure needs is set by the engineer on the drawings, not by the supplier.

### Does rebar grade change its weight per foot?

No, rebar grade does not change its nominal weight per foot. ASTM A615 lists one nominal weight for each bar designation number in Table 1 and defines grade separately by minimum yield strength. A Grade 60 #5 and a Grade 80 #5 both extend at 1.043 pounds per foot.