Three pricing units show up on the same rebar quote: dollars per hundredweight ($/cwt), dollars per short ton ($/ton), and dollars per stick or per pound. A US hundredweight is exactly 100 lb and a US short ton is 2,000 lb, so $/cwt to $/ton is a fixed ×20 conversion with no rounding loss [S1][S3].
Mill price letters from CMC, Gerdau Long Steel North America, and Nucor all lead with $/cwt because that matches how service centers and rebar fab shops stock and cut bar [S2]. Per-piece pricing only enters the picture at the retail or fab-shop level, where a rebar cutter and rebar bender operation yields cut-to-length bars billed by the stick.
Unit Definitions and Conversion Math
In US steel trading, the hundredweight (cwt) is 100 lb, the short ton is 2,000 lb, and 1 short ton equals exactly 20 cwt, so multiplying a $/cwt quote by 20 returns the $/short ton figure and dividing a $/ton quote by 20 returns the $/cwt figure [S1][S3][S5]. The metric tonne (1,000 kg, or 2,204.6 lb) sits 10.23% above a US short ton, which is why a metric-ton quote from a Canadian or Mexican mill is not directly comparable to a US $/short ton quote without a 2,000/2,204.6 = 0.9072 conversion factor [S3].
For per-pound and per-piece, the chain runs: $/cwt ÷ 100 = $/lb, and $/lb × (weight per stick) = $/piece. With #5 rebar at 1.043 lb/ft and a 20 ft stick at 20.86 lb, a $42/cwt quote implies $0.42/lb and about $8.76 per 20 ft #5 bar before any fab or cut charge [S2][S4]. The same #5 stick priced at the $840/ton mill assessment weighs 0.01043 ton, so the per-stick cost is $840 × 0.01043 = $8.76, the cross-check on the per-pound path.
Where Each Unit Is Used in the Supply Chain
Mill assessments and producer price letters are quoted in $/cwt because that matches the standard North American pricing convention for long products, and Fastmarkets’ daily rebar assessment reports both $/cwt and the equivalent $/short ton on the same line [S2]. Service centers and rebar fab shops buy by the ton (typical purchase orders start at 20 ton) and sell to contractors by the piece, by the foot, or by the hundredweight, with the choice driven by job size and the equipment on site [S3].
Per-piece pricing shows up wherever cut-and-bend inventory is the constraint, meaning the fab shop already owns the rebar straightener and rebar tool inventory and is selling processed length, not raw weight. Per-pound pricing is the natural unit for the engineering take-off, since rebar is specified by bar size (#3 through #18 in the US system) and each size has a published weight per foot that the take-off multiplies by linear footage to get total weight [S4].
Current Price Levels and What Moved Them
Fastmarkets assessed US domestic rebar fob mill at $42/cwt ($840/short ton) on June 11, 2025, up 7.69% from $39/cwt the prior week, and the same assessment put import rebar loaded truck Port of Houston at $780-840/ton ($39-42/cwt), up from $720-760/ton a week earlier [S2]. CMC, Gerdau, and Nucor each issued customer letters with a $3/cwt price increase on standard sizes in the first half of June 2025, and Nucor added a separate $40/ton premium on 20 ft length bars to differentiate from the standard 60 ft stock length [S2].
The driver was the doubling of Section 232 steel and aluminum tariffs to 50%, effective June 4, 2025, which reduced import competitiveness and gave domestic mills room to push list prices even with end-user demand described by buyers as lackluster and slowing [S2]. The domestic rebar versus No1 heavy melt Chicago scrap spread widened to $558.75/ton on June 11, 2025, up 12.03% from $498.75/ton a week earlier, which is a useful margin proxy for the melt-and-re-roll economics behind the mill hike [S2].
Decision Matrix: Which Unit to Use
For a buyer comparing two mill offers, the cleanest unit is $/cwt because that is what the producer price letter uses, and any $/ton or $/lb quote should be converted back to $/cwt before comparison to avoid the short ton versus metric tonne trap [S1][S2][S3]. For a contractor writing a bid, the working unit is $/lb, because the structural take-off gives pounds per size, and a per-pound quote is the only one that survives a switch between #4, #5, and #6 bar without re-pricing the whole job [S4].
For a fab shop selling to a small concrete contractor who needs 30 pre-cut #4 bars at 4 ft each, per-piece pricing is operationally correct because the cutting, bundling, and loading cost is roughly fixed per stick regardless of weight, and a 120 lb order of 4 ft #4s is not what arrives on a 20 ton truck. For a distributor quoting a service-center order of 20-40 ton, per-hundredweight is the right granularity because it lets the buyer adjust tonnage without re-quoting 400 individual sticks.
The common error is mixing units mid-quote, for example a $30 figure that the supplier intends as $/cwt but the buyer reads as $/lb, which produces a 100× price error. The defense is the explicit notation: $/cwt, $/short ton, $/lb, or $/piece, and verifying the ton type (short ton at 2,000 lb versus metric tonne at 1,000 kg versus long ton at 2,240 lb) on every cross-border quote [S3][S5].
Limitations and Common Failure Modes
Per-piece pricing hides freight in a way that per-hundredweight pricing does not, because a 20 ft #3 bar weighs 7.46 lb and a 20 ft #18 bar weighs about 122 lb, so a fixed $/piece adder overcharges the small bar and undercharges the large bar relative to the steel content [S4]. Per-pound pricing looks clean on a spreadsheet but breaks down at the mill order level because mills do not sell in 1,000 lb increments, so the contractor must convert back to cwt or tons to place a real PO [S3].
Lead times of three to four weeks reported in the same June 2025 assessment window mean a quote locked at $42/cwt is not protected if delivery slips into a tariff or scrap-price regime change [S2].
Standards, Sourcing, and Cost Cross-Checks
Rebar weight per foot is governed by ASTM published lookup values, not theoretical diameter calculations, because mill-actual diameter and rib geometry deviate from nominal values, so a contractor’s per-pound conversion should always use the ASTM weight per foot for the chosen bar size [S4]. The Fastmarkets daily and monthly assessments are the standard US reference for both domestic fob mill and import landed prices, with the rebar No1 heavy melt Chicago scrap spread serving as a margin indicator for the domestic melt shop [S2].
For a sanity check on any per-piece quote, take three steps: convert the mill-side $/cwt to $/lb using the 1/100 rule, multiply by the ASTM weight per foot and the stick length to get theoretical per-piece steel cost, then add the fab cut and bend charge, which for a #5 20 ft stick on a standard rebar bender typically runs a few dollars per piece. The Rebar PPI 2026 long-steel classification data sits upstream of these conversions and determines which PPI series the per-cwt move shows up in for contract escalation clauses. Rebar weight tolerance at the pour is governed separately by ACI 117 placement tolerances, which is where a $/cwt error first becomes visible as a placement-tolerance rejection on site.