Steel Weight Calculator: Free Bar Stock Tool for US Forge Shops
Calculate the exact weight of any steel bar profile in pounds before you call your supplier. Round, square, flat, hex, tube, rectangular tube, and angle iron. AISC-verified density data. Add quantity, waste factor, and get a cost estimate in seconds.
Bar Stock Math in American Shops: What Goes Wrong Without It
If you have ever ordered steel bar stock by eyeballing a length and guessing at the weight, you already know what happens: you either run short three pieces from the end of the job and wait a week for a second delivery, or you end up with a pile of expensive drops in the corner that nobody ever uses. Both outcomes cost real money, and both are completely avoidable if you spend about sixty seconds running the calculation before you pick up the phone or pull up your supplier’s ordering portal.
The math is not complicated. Steel weight comes down to one equation that has not changed since the first structural steel table was published: weight equals volume times density. The density of carbon steel is 0.2836 pounds per cubic inch, a figure established in the American Institute of Steel Construction Steel Construction Manual, currently in its 16th Edition, which sets 490 pounds per cubic foot (490 pcf) as the standard design density for all carbon structural steel. That constant converts to 0.2836 lb/in³ and is used by every licensed structural engineer, every steel service center, and every fabrication estimator in the country. The only part of the equation that changes from one order to the next is the volume, and the volume depends on the shape and dimensions of the bar you are ordering.
What makes this calculation slip through the cracks in most shops is not ignorance of the formula but the friction of doing it manually for every line item on a cut list. A job might involve four different profiles in three different lengths. Running the arithmetic by hand for every combination, in a shop where you also have steel to move and parts to cut, is the kind of task that gets skipped under time pressure. The result is that most small to mid-size fabrication shops in the United States operate on an informal ordering system that amounts to “order what I used last time plus twenty percent.” That system works until it does not, and when it does not, the cost shows up in emergency freight charges, project delays, or a stockroom full of material that does not match anything on the current job roster.
This calculator addresses that friction by putting all eight common bar stock profiles into one tool with material-grade-specific densities pulled from the AISC Steel Construction Manual and the ASM International Metals Handbook, Volume 1. You enter your dimensions, pick your grade, set your quantity and waste factor, and get the order weight in pounds in one step. The tool also calculates the linear weight per foot, which is what you need when your supplier quotes by the foot rather than by the pound, and it lets you enter a price per pound to get an estimated material cost before placing the order.
The waste factor field is the feature that separates this calculator from most generic weight tools online. Blacksmithing and knife-making shops typically lose 25 to 35 percent of starting bar weight to scale and grinding. Structural fabrication shops typically add 10 to 15 percent for cut-off ends and weld gaps. A general machine shop cutting blanks from bar stock might run 5 to 12 percent. The default 30 percent in the calculator is calibrated for forge shop use; change it to match your specific process and the result becomes a precise order quantity rather than a starting point that still requires a gut-check.
How the Calculator Handles All Eight Common Bar Stock Profiles
Every profile this calculator handles uses the same underlying approach: find the cross-sectional area of the bar, multiply by the length to get volume in cubic inches, then multiply by the density in pounds per cubic inch to get weight in pounds. The formula for cross-sectional area is the only thing that changes between profiles, and each one comes from basic geometry that has been standard in US engineering reference texts since at least the 1950s.
Round Bar
Round bar is the most common starting stock for knife making, turned parts, and shafting. The cross-section is a circle, so the area equals pi times the radius squared. Since bar stock is specified by diameter rather than radius, the formula uses diameter divided by two for the radius.
Volume = π × (D ÷ 2)² × Length
// D = diameter in inches, Length in inches
Weight = Volume × 0.2836 lb/in³
A 3/4-inch round bar of 1084 steel, 12 inches long: Volume = 3.14159 x (0.375)² x 12 = 5.301 in³. Weight = 5.301 x 0.2836 = 1.503 lb per piece.
Square Bar
Square bar cross-section area is simply the side length squared. Square bar is common in general blacksmithing for hooks, handles, and hardware.
Volume = S² × Length
Weight = Volume × 0.2836 lb/in³
Flat Bar
Flat bar is the starting stock for most farrier tools, kitchen knife blanks cut from wider stock, and structural hardware. Width is the larger dimension, thickness the smaller.
Volume = Width × Thickness × Length
Weight = Volume × 0.2836 lb/in³
Hex Bar
Hex bar (hexagonal bar stock) is used for bolt blanks, tool handles, and decorative ironwork. The across-flats dimension is what hardware stores and suppliers call the wrench size. The hex cross-section area formula uses the geometric constant 0.866025 (which is the square root of 3 divided by 2), giving the area of a regular hexagon directly from the across-flats width.
Cross-section Area = 0.866025 × AF²
Volume = 0.866025 × AF² × Length
// AF = across-flats width in inches
Round Tube and Pipe
For round tube and pipe, you subtract the hollow interior from the outer circle. Enter the outer diameter and wall thickness; the calculator derives the inner diameter as OD minus two times the wall thickness and computes the annular ring area. This is the correct calculation for DOM (Drawn Over Mandrel) tubing, ERW (Electric Resistance Welded) pipe, and schedule pipe when you know the actual OD and wall thickness from the pipe chart.
ID = OD - (2 × Wall)
Volume = π × (OD² - ID²) ÷ 4 × Length
Square Tube and Rectangular Tube
Square and rectangular hollow structural sections (HSS) are widely used in welded frames, table bases, equipment racks, and off-road fabrication. The outer dimensions and wall thickness determine the cross-section area by subtracting the inner rectangle from the outer.
Square Tube: Volume = (OD² - (OD - 2×Wall)²) × Length
Rect Tube: Volume = (W×H - (W-2W)×(H-2W)) × Length
// W = wall thickness
Angle Iron (Equal and Unequal Leg)
Angle iron (structural angle) is the L-shaped steel section used in framing, brackets, and forge tooling. The standard cross-section area formula for an angle with leg lengths A and B and uniform thickness T is (A + B – T) x T, which accounts for the corner material shared between both legs. This calculator handles both equal-leg angles (A = B) and unequal-leg angles by letting you enter different leg lengths.
Area = (LegA + LegB - T) × T
Volume = Area × Length
// T = leg thickness (same for both legs)
Structural shapes note: For wide-flange beams (W-shapes), standard channels (C-shapes), S-beams, and similar structural sections, the actual cross-section area from AISC section property tables is more accurate than a geometric approximation because the flange-to-web fillet transitions add material that a simple formula underestimates. For those shapes, use the tabulated weight-per-foot values from the AISC Steel Construction Manual Part 1 directly.
Steel Grade Densities: Official AISC, ASTM, and ASM Handbook Reference Data
Every density value in this calculator is sourced from one of three authoritative US reference sources: the AISC Steel Construction Manual (16th Edition, 2023), the ASM International Metals Handbook Volume 1 (Properties and Selection: Irons, Steels, and High-Performance Alloys), or the relevant ASTM product standard for the material in question. Using verified institutional density values rather than rounded approximations keeps this calculator accurate enough for supplier order quantities and material cost estimates across all common forging and fabrication steels.
| Steel Grade | Density (lb/in³) | Density (kg/m³) | Standard / Source | Typical US Applications |
|---|---|---|---|---|
| A36 / 1018 / Mild | 0.2836 | 7,850 | AISC SCM 16th Ed, 490 pcf | Structural steel, general fabrication |
| 1084 High Carbon | 0.2836 | 7,850 | ASM Handbook Vol.1 | Blades, springs, wear parts |
| 1095 High Carbon | 0.2836 | 7,850 | ASM Handbook Vol.1 | Knife blades, springs |
| 5160 Chrome-Vanadium | 0.2840 | 7,861 | ASM Handbook Vol.1 | Swords, axes, leaf springs |
| O1 Tool Steel | 0.2844 | 7,872 | ASM Handbook Vol.16 | Dies, punches, blades |
| W2 Tool Steel | 0.2836 | 7,850 | ASM Handbook | Hamon blades, chisels |
| 52100 Bearing Steel | 0.2836 | 7,850 | ASM Handbook | ABS test blades, hunting knives |
| 304 Stainless | 0.2865 | 7,930 | ASTM A240 | Food service, marine, decorative |
| 316 Stainless | 0.2883 | 7,980 | ASTM A240 | Saltwater, chemical, medical |
A practical note for structural engineers and fabricators: the AISC uses a single density of 490 pcf for all carbon structural steels regardless of strength grade, from A36 (Fy = 36 ksi) through A514 (Fy = 100 ksi). The grade determines mechanical properties through alloying and heat treatment, not through changes in bulk density. For stainless steels, ASTM A240 specifies the density of 304 at 7,930 kg/m³ and 316 at 7,980 kg/m³, both slightly higher than carbon steel because of the nickel and chromium additions. Using the carbon steel value (7,850 kg/m³) for stainless in a weight-critical application introduces about a 1.5 percent error on 304 and about 1.7 percent on 316, which is small but becomes significant at tonnage quantities.
Mill Tolerance and Real-World Accuracy
The formulas this calculator uses assume perfect nominal dimensions: a 3/4-inch round bar is exactly 0.750 inches in diameter. In practice, ASTM A108 and A36 bar stock carries dimensional tolerances, and your actual piece may be anywhere from -0.016 to +0.031 inches off nominal for common sizes under 2 inches. This tolerance band introduces a weight variance of approximately 2 to 4 percent relative to the nominal calculation. For ordering purposes, this level of accuracy is more than adequate. For precision weight verification of a delivered lot, you weigh the actual pieces. For AISC section property use in structural calculations, use the tabulated values from the AISC Manual rather than calculating from nominal bar dimensions.
For US users purchasing from national steel service centers, the reference documentation is the American Iron and Steel Institute (AISI) product standards and the Metals Service Center Institute (MSCI) shipping documentation, both of which use the AISC-standard 490 pcf density for weight calculations on invoices and bills of lading.
Three Real US Shop Orders Calculated Step by Step
Marcus runs a small production knife operation out of his Austin garage, making chef’s knives for local restaurant accounts. He is building a batch of 20 blades and plans to start each from a 3/4-inch diameter 1084 round bar, 14 inches long, which gives him enough material for the blade plus tang with about an inch of cut-off waste per piece. He wants to know how many pounds to order and what it will cost at his supplier’s current rate of $0.42 per pound for 1084 bar.
Profile: Round bar, 3/4 in diameter, 14 inches long, 1084 steel
Volume per piece: 3.14159 x (0.375)² x 14 = 6.185 in³
Weight per piece: 6.185 x 0.2836 = 1.754 lb
Net total (20 pieces): 1.754 x 20 = 35.08 lb
With 30% forge/grind waste: 35.08 x 1.30 = 45.60 lb to order
Estimated cost at $0.42/lb: 45.60 x 0.42 = $19.15
Marcus orders 50 pounds of 3/4-inch round 1084 from Texas Knifemaker’s Supply, giving himself a small buffer above the calculated 45.6 lb for pieces that might crack during heat treatment and need to be replaced.
Riverside Metal Works in Nashville is building a set of 10 equipment stands for a local brewery, each requiring two pieces of 2-inch by 3-inch rectangular HSS (hollow structural section) with 3/16-inch wall, 48 inches long. The project manager needs to know the total steel weight for the freight estimate and the material cost at $0.68 per pound for A513 rectangular tube.
Profile: Rectangular tube, 3 in width x 2 in height, 3/16 in wall (0.1875 in), 48 in long, carbon steel
Inner width: 3.00 - 2x0.1875 = 2.625 in
Inner height: 2.00 - 2x0.1875 = 1.625 in
Cross-section area: (3.0 x 2.0) - (2.625 x 1.625) = 6.000 - 4.266 = 1.734 in²
Volume per piece: 1.734 x 48 = 83.23 in³
Weight per piece: 83.23 x 0.2836 = 23.60 lb
2 pieces x 10 stands = 20 pieces total: 23.60 x 20 = 472.0 lb
With 10% fabrication waste: 472.0 x 1.10 = 519.2 lb to order
Material cost estimate at $0.68/lb: 519.2 x 0.68 = $353.06
Riverside orders 525 lb of the rectangular tube in full mill lengths and confirms with the freight company that the haul is about 520 pounds, which keeps them under the threshold for a full pallet shipping rate versus a smaller parcel carrier quote.
Jennifer is a professional farrier and part-time blacksmith in Portland who uses 5160 spring steel for her custom hoof picks and rasps. She is placing a quarterly order and needs to know the weight of 25 pieces of 1/2-inch x 1-1/4-inch flat bar, each 10 inches long, plus 15 pieces of 3/4-inch hex bar 8 inches long for decorative hook blanks. She also wants to know the linear weight per foot of each profile for quick reference in future orders.
5160 Flat Bar (1/2 in x 1-1/4 in x 10 in):
Volume: 0.50 x 1.25 x 10 = 6.25 in³
Weight per piece: 6.25 x 0.2840 = 1.775 lb (5160 density = 0.2840)
25 pieces net: 1.775 x 25 = 44.38 lb
Linear weight: 6.25/10 x 12 x 0.2840 = 2.130 lb/ft
Mild Steel Hex Bar (3/4 in AF x 8 in):
Volume: 0.866025 x 0.75² x 8 = 0.866025 x 0.5625 x 8 = 3.897 in³
Weight per piece: 3.897 x 0.2836 = 1.105 lb
15 pieces net: 1.105 x 15 = 16.58 lb
Combined order with 20% waste: (44.38 + 16.58) x 1.20 = 73.15 lb
Jennifer places a single combined order for 75 pounds, split between the two profiles. Having the linear weight per foot figured out means she can quote future orders in feet when suppliers offer better pricing on full mill length cuts rather than cut-to-length service.
What Does Steel Bar Stock Cost Per Pound in the US Right Now?
The price-per-pound field in the calculator is most useful when you plug in a quote from your actual supplier rather than a market benchmark, because steel pricing varies significantly by region, purchase quantity, and delivery terms. That said, having a general range in mind before you call helps you recognize when a quote is out of line. The following ranges reflect typical US steel service center pricing for small-quantity cut-to-length orders as of early to mid-2025, based on publicly available market data from the US Geological Survey National Minerals Information Center and industry sources.
Hot-rolled carbon steel bar stock (A36, 1018) in common round and flat profiles typically runs from $0.35 to $0.60 per pound for quantities under 500 pounds from a service center, with prices dropping toward $0.25 to $0.35 per pound for full-mill-length purchases or truckload quantities. Cold-finished bars, which have tighter tolerances and a smoother surface, add roughly $0.05 to $0.15 per pound over hot-rolled equivalents. Alloy bar steels like 4140 and 4340 range from $0.60 to $1.20 per pound. Specialty knifemaking steels (1084, 1095, 5160, O1) sold through specialty suppliers like Admiral Steel or New Jersey Steel Baron range from $2.50 to $8.00 per pound in small quantities, reflecting the cost of high-carbon production and the niche market they serve. Stainless bar stock (304 and 316) typically runs from $1.80 to $4.00 per pound depending on size and quantity.
Freight is a significant additional cost that the price-per-pound field in this calculator does not capture. For small shops ordering 50 to 200 pounds of bar stock at a time, UPS Ground or LTL freight can add $0.10 to $0.25 per pound effectively to the total cost. Ordering in quantities that justify a full pallet (typically 500 to 2,000 pounds) substantially lowers the per-pound freight contribution. The weight calculation this tool provides feeds directly into freight estimation, since most carriers quote based on total shipment weight for LTL loads.
Steel prices fluctuate with domestic production capacity, scrap metal markets, and trade policy. The US Department of Commerce monitors steel imports and domestic production under Section 232 trade provisions, and tariff changes can shift service center pricing by 5 to 20 percent over short periods. The calculator’s cost estimate is only as current as the price you enter, which is another reason to use an actual supplier quote rather than a market average.
Expert Tips for Ordering Steel Bar Stock Without Expensive Mistakes
Always Set a Waste Factor Before Ordering
The net weight from a pure dimensional calculation is the theoretical minimum, never what you actually order. Forge shops should use 25 to 35 percent waste. Fab shops cutting blanks should use 10 to 15 percent. Machining shops should use 5 to 10 percent. Run the calculation with your specific waste factor rather than rounding up by feel and you will stop carrying excess drops that tie up cash in inventory.
Get the Linear Weight Before You Call
Many US steel service centers price cut-to-length orders by the foot, not by the pound. Have the linear weight per foot from the calculator ready before the call so you can convert their price-per-foot quote directly into a total cost and compare it to a price-per-pound quote from another supplier. Without it, you are comparing two different numbers that require a calculation neither party may do on the spot.
Use Actual OD and Wall Thickness for Tube, Not Nominal Pipe Size
Nominal pipe size (NPS) is not the outside diameter. A 1-inch NPS pipe has an OD of 1.315 inches. If you enter the nominal size into the tube calculator instead of the actual OD from the pipe schedule chart, your weight will be significantly off. Always look up the actual OD and wall thickness from the ASME B36.10 pipe schedule or the supplier’s product spec sheet before running the tube calculation.
Check the Mill Test Certificate Density for Critical Applications
For fabrication involving weight-sensitive structures, engineered supports, or aerospace applications, the nominal density constant is not good enough. Request the Mill Test Certificate (MTC) from your steel supplier. The MTC shows the actual chemistry of the specific heat of steel you received, and from that you can calculate a more precise density using the known mass contributions of each alloying element. The AISC constant covers commercial and fabrication work well; the MTC route is for structural-critical use.
Order in Full Mill Lengths When Your Budget Allows
Steel service centers typically sell bar stock in 12-foot, 20-foot, or random-length mill bars, with cut-to-length service adding a cutting charge and sometimes a premium per piece. If your project can absorb some additional material, ordering full mill lengths and cutting in-house is almost always cheaper per pound than ordering cut-to-length on short pieces. Use the calculator to find the weight of a full 20-foot bar and compare it to the weight of the cut pieces you actually need to decide if the cut charge is worth it.
Save Your PDF Report with Every Order
The PDF report from this calculator captures every input and result in a single document. Save it alongside your supplier invoice for every order. When the same job comes around six months later, you have a complete record of the exact dimensions, grade, waste factor, and per-piece weight you used the first time. That record shortens the ordering process for repeat jobs from 20 minutes to two minutes.
Quick Reference: Steel Bar Stock Weight Per Foot for Common US Sizes
| Profile | Size | lb / ft (A36 / Carbon) | lb / ft (304 SS) | Notes |
|---|---|---|---|---|
| Round Bar | 1/2 in | 0.668 | 0.677 | Standard knifemaking billet size |
| Round Bar | 3/4 in | 1.502 | 1.522 | Common forge shop round bar |
| Round Bar | 1 in | 2.670 | 2.706 | Standard machining stock |
| Round Bar | 1-1/4 in | 4.172 | 4.228 | Axle and shaft stock |
| Round Bar | 2 in | 10.68 | 10.82 | Heavy bar stock |
| Square Bar | 1/2 in | 0.850 | 0.861 | Decorative ironwork |
| Square Bar | 3/4 in | 1.913 | 1.939 | Tool handles, hooks |
| Square Bar | 1 in | 3.400 | 3.445 | General fabrication |
| Flat Bar | 1/4 x 2 in | 1.700 | 1.723 | Strapping and brackets |
| Flat Bar | 1/2 x 2 in | 3.400 | 3.445 | Blade stock, hardware |
| Flat Bar | 1/2 x 3 in | 5.100 | 5.168 | Large blade blanks |
| Hex Bar | 3/4 in AF | 1.658 | 1.680 | Bolt blanks, hook stock |
| Hex Bar | 1 in AF | 2.948 | 2.987 | Nuts and fittings stock |
| Sq Tube | 1 x 1 x 1/8 wall | 1.440 | 1.459 | Light framing |
| Sq Tube | 2 x 2 x 3/16 wall | 4.320 | 4.378 | Equipment frames |
| Angle | 2 x 2 x 1/4 | 3.190 | 3.233 | Shelf brackets, framing |
Calculated using AISC density (0.2836 lb/in³) for carbon steel and ASTM A240 density (0.2865 lb/in³) for 304 stainless. Values match standard AISC and supplier reference tables.
Frequently Asked Questions About Steel Bar Stock Weight Calculations
Use 0.2836 lb/in³ (490 pcf or 7,850 kg/m³). This is the density specified in the AISC Steel Construction Manual, 16th Edition, and is the standard value used by every licensed structural engineer, steel service center, and fabrication estimator in the United States for all carbon and mild structural steel grades from A36 through A572 Grade 65. The calculator defaults to this value automatically for all carbon steel selections.
A regular hexagon has a cross-section area equal to 0.866025 times the across-flats dimension squared, where 0.866025 is the geometric constant (square root of 3 divided by 2). A round bar uses pi divided by 4 times the diameter squared. For the same nominal size, a hex bar is slightly lighter than a round bar because the corners of the hexagon have less material than the full circle would contain. A 3/4-inch hex bar weighs about 1.658 lb/ft; a 3/4-inch round bar weighs about 1.502 lb/ft. Note that the 3/4-inch refers to across-flats for hex and to diameter for round, so you are comparing the same tool size but different actual cross-section shapes.
US tube and pipe is sold and specified by outer diameter and wall thickness, not by inner diameter, because wall thickness is the controlled manufacturing dimension. The inner diameter is derived from OD minus twice the wall thickness. When you look up a tube in a supplier’s catalog or in the ASME B36.10 pipe schedule table, you will find OD and wall thickness listed, not ID. Entering OD and wall directly matches the numbers on your order sheet without requiring you to do a pre-conversion calculation.
For ordering purposes, the nominal calculation is typically within 2 to 4 percent of the actual weighed weight of delivered material. ASTM dimensional tolerances for hot-rolled bar stock allow plus or minus 1 to 3 percent variation in cross-section dimensions depending on size, which propagates to weight variance when squared in the area formula. For cut-to-length carbon bar stock, the calculation is accurate enough to order the right quantity, confirm freight weights, and estimate material costs. For precision applications where exact batch weight matters (such as certified aerospace material traceability), you weigh the actual pieces on calibrated scales.
For forge shop and knife-making use, 25 to 35 percent is the typical range. Scale loss from repeated heat cycles accounts for 2 to 5 percent. Grinding and profiling loss during blade shaping accounts for another 20 to 35 percent depending on how much material removal the design requires. A simple kitchen knife profile removes less material than a heavily tapered blade with a full distal taper and long ricasso. Add another 5 to 10 percent if you are quench-hardening in batches where some pieces may crack and need to be replaced. The 30 percent default in this calculator is calibrated for general single-bevel knife making. Adjust it up or down based on your specific process and track your actual material usage over several projects to dial it in precisely.
Not directly, because wide-flange beams, standard I-beams, and channels have flange-to-web fillet transitions that add material a simple geometric formula underestimates by 2 to 5 percent. For structural sections, use the tabulated weight-per-foot values from Part 1 of the AISC Steel Construction Manual, which lists actual weights derived from precise cross-section measurements for every W, S, C, MC, L, and HSS shape in production. If you need to estimate the weight of a structural section that is not in the AISC tables, the AISC Shapes Database (available as a free download at aisc.org) contains the tabulated weights for all standard US sections.
5160 spring steel contains 0.7 to 0.9 percent chromium and about 0.1 percent vanadium in addition to its carbon content. Chromium has a slightly higher atomic mass than iron, so chromium-alloyed steels are marginally denser than plain carbon steels of similar carbon content. The ASM Handbook lists 5160 at 7,861 kg/m³ (0.2840 lb/in³) versus 7,850 kg/m³ (0.2836 lb/in³) for plain carbon grades. The difference is about 0.14 percent, which amounts to about 0.06 pounds on a 40-pound order. For ordering purposes, the difference is negligible; for MTC-documented precision work, use the grade-specific value.
Linear weight (pounds per foot) lets you convert between feet and pounds directly, which you need when suppliers quote pricing by the foot. If a service center quotes 3/4-inch round bar at $0.65 per foot, you multiply by the linear weight of 1.502 lb/ft to get $0.433 per pound effective price, then you can compare it to another supplier quoting the same material at $0.42 per pound. Linear weight also tells you how many feet of stock a given weight order contains, which matters when you are buying full-length bars and cutting them yourself: a 100-pound order of 3/4-inch round bar contains 100 / 1.502 = 66.6 linear feet.
Yes. The formula (Leg A + Leg B – Thickness) times Thickness gives the correct cross-section area for any unequal-leg angle where both legs have the same wall thickness. This is the standard formula used in structural engineering references and matches the AISC tabulated weights for equal-leg angles to within 0.5 percent. For unequal-leg angles, the calculator handles them accurately as long as both legs share the same thickness, which is the standard manufacturing configuration for ASTM A36 and A572 structural angles. If you have an angle with different leg thicknesses (a machined or custom angle rather than a standard structural shape), this formula does not apply.
Yes, using the Custom Density option. Enter the density in pounds per cubic inch for your material: aluminum 6061 is 0.0975 lb/in³, aluminum 2024 is 0.101 lb/in³, copper (C11000) is 0.323 lb/in³, cartridge brass (C26000) is 0.308 lb/in³, and naval brass (C46400) is 0.304 lb/in³. These values are from ASM Handbook Vol.2 (Nonferrous Alloys). All the profile formulas apply equally to any homogeneous metal or alloy; only the density changes.
DOM (Drawn Over Mandrel), ERW (Electric Resistance Welded), and seamless pipe all have the same material density and use the same weight formula: cross-section area times length times density. The differences are in manufacturing process and dimensional tolerance, not in the weight calculation method. DOM tube typically has tighter OD and wall tolerances than ERW, meaning your calculated weight will be closer to the actual weighed weight. For seamless pipe specified by nominal pipe size (NPS) and schedule, look up the actual OD and wall from the ASME B36.10M table; do not use nominal pipe size as the diameter in the calculator.
Use the Flat Bar profile. Enter the plate width in the Width field, the plate thickness in the Thickness field, and the plate length in the Length field. All inputs are in inches (or feet using the toggle). The formula is identical to flat bar because plate is simply a very wide, relatively thin flat bar. A standard 4-foot by 8-foot plate at 1/4-inch thick: Width = 48 in, Thickness = 0.25 in, Length = 96 in. Volume = 48 x 0.25 x 96 = 1,152 in³. Weight = 1,152 x 0.2836 = 326.7 lb, matching the standard reference figure of 326.7 lb for a 4×8 quarter-inch A36 plate.
Scale (iron oxide) forms on the surface of steel with every heat cycle and flakes off during forging, permanently reducing the weight of the workpiece. A rough rule of thumb for forge shop practice is that each heat-and-hammer cycle removes about 0.3 to 0.5 percent of surface material to scale. A blade with 10 to 15 full heats loses approximately 2 to 5 percent of its starting weight to scale before grinding begins. The waste factor field in this calculator lets you include this loss in your ordering calculation: if you set 35 percent waste, you are accounting for roughly 30 percent grinding loss plus approximately 5 percent scale loss across the forging process.
A 1-inch diameter round bar, 20 feet (240 inches) long, of carbon steel (0.2836 lb/in³): Volume = pi x (0.5)² x 240 = 188.5 in³. Weight = 188.5 x 0.2836 = 53.45 lb. This matches the standard reference figure of 2.67 lb/ft x 20 ft = 53.4 lb. You can also verify this directly by entering the values into the calculator above: Profile = Round, Diameter = 1 in, Length = 20 ft (with the ft toggle selected), Material = Mild.
ASTM A108 covers cold-finished carbon and alloy steel bars, specifying dimensional tolerances for round, square, hexagonal, and flat profiles. ASTM A36 covers hot-rolled structural steel shapes, plates, and bars, and references ASTM A6 for the general requirements including tolerances on cross-section dimensions, length, camber, and straightness. For stainless bar stock, ASTM A276 (hot and cold-finished stainless bars) and ASTM A484 (general requirements for stainless bars) govern the dimensional requirements. These documents are published and maintained by ASTM International and are available through their online document portal.
The PDF report from this calculator is suitable as an internal reference document for purchase requests, material requisitions, and shop planning records. It shows all inputs, the density source (AISC SCM 16th Ed or ASTM A240), and the calculated results in a clean, dated format that can be attached to a purchase order or filed with project records. It is not a certified engineering calculation or a material specification document, and it should not be submitted as a structural design calculation for permit or code compliance purposes. For those applications, a licensed professional engineer produces and stamps the calculation using the applicable building code and AISC design standards.
Related Blacksmithing and Metalwork Calculators
All calculations on this page use the steel density constants from the AISC Steel Construction Manual, 16th Edition (490 pcf for carbon steel) and ASTM A240 (for stainless steel grades), as documented by the ASM International Metals Handbook, Volume 1. These values are suitable for ordering, estimating, and planning purposes. They are not certified engineering calculations and must not be used for structural design, load-bearing analysis, or any application governed by building codes, AISC design standards, or OSHA load-bearing regulations without review by a licensed professional engineer. Actual material weight depends on dimensional tolerances per ASTM A108, A36, A276, or applicable product standard; verify against Mill Test Certificates for precision applications. USCalculators.com has no commercial relationship with steel suppliers, industry associations, or standards bodies referenced on this page. External links are provided for reference only.