Lead Round Bar Weight
Mass per metre and per foot for lead round bar at 11,340 kg/m³ (ASTM B29 (UNS L50049, chemical lead)). Every figure is for the section as drawn. A 6 m length of this size weighs 33.4 kg (74.8 lb per 20 ft).
At the reference dimensions (d = 25 mm) this section has a cross-sectional area of 490.9 mm², giving 5.567 kg/m (3.741 lb/ft). Against carbon steel's 7,850 kg/m³ that is +44.5 % — the same section in steel would be 3.853 kg/m.
Round Bar — formula and derivation
Area of a round bar
A = π/4 · d²
A = π/4 × d², where d is the outside diameter
Worked through with the default dimensions:
A = π/4 × d²A = 0.785398 × 25²A = 0.785398 × 625.0A = 490.9 mm²
- d
- Diameter — Outside diameter measured across the bar.
Weight follows from the area with no further geometry: m = A × 10⁻⁶ × ρ, where A is in mm², ρ in kg/m³ and m in kg/m. At 11,340 kg/m³ that is 5.5665 kg/m for the reference size above.
Lead round bar — size series
| Diameter | Cross-section | Mass / length |
|---|---|---|
| 6.0 mm | 28.27 mm² · 0.0438 in² | 0.321 kg/m · 0.215 lb/ft |
| 8.0 mm | 50.27 mm² · 0.0779 in² | 0.570 kg/m · 0.383 lb/ft |
| 10 mm | 78.54 mm² · 0.1217 in² | 0.891 kg/m · 0.598 lb/ft |
| 12 mm | 113.10 mm² · 0.1753 in² | 1.283 kg/m · 0.862 lb/ft |
| 14 mm | 153.94 mm² · 0.2386 in² | 1.746 kg/m · 1.173 lb/ft |
| 16 mm | 201.06 mm² · 0.3116 in² | 2.280 kg/m · 1.532 lb/ft |
| 20 mm | 314.16 mm² · 0.4869 in² | 3.563 kg/m · 2.394 lb/ft |
| 25 mm | 490.87 mm² · 0.7609 in² | 5.567 kg/m · 3.741 lb/ft |
| 30 mm | 706.86 mm² · 1.0956 in² | 8.016 kg/m · 5.386 lb/ft |
| 32 mm | 804.25 mm² · 1.2466 in² | 9.120 kg/m · 6.128 lb/ft |
| 40 mm | 1,256.64 mm² · 1.9478 in² | 14.250 kg/m · 9.576 lb/ft |
| 50 mm | 1,963.50 mm² · 3.0434 in² | 22.266 kg/m · 14.962 lb/ft |
| 60 mm | 2,827.43 mm² · 4.3825 in² | 32.063 kg/m · 21.545 lb/ft |
| 80 mm | 5,026.55 mm² · 7.7912 in² | 57.001 kg/m · 38.303 lb/ft |
| 100 mm | 7,853.98 mm² · 12.1737 in² | 89.064 kg/m · 59.848 lb/ft |
Computed for Lead at 11340 kg/m³ (0.4097 lb/in³). ASTM B29 (UNS L50049, chemical lead).
Each row is one nominal size. Because the area is computed from your dimensions rather than read from a mill table, a non-standard size is just as accurate — put it into the calculator above rather than interpolating between rows.
Imperial sizes
Round Bar is also bought in inch sizes. The conversions below are exact (1 in = 25.4 mm by definition), so the metric equivalents are the true millimetre dimensions rather than a rounded nominal figure.
| Stock size | Metric equivalent mm | Cross-section | Mass / length |
|---|---|---|---|
| 1/8 in | 3.17 | 7.92 mm² · 0.0123 in² | 0.090 kg/m · 0.060 lb/ft |
| 3/16 in | 4.76 | 17.81 mm² · 0.0276 in² | 0.202 kg/m · 0.136 lb/ft |
| 1/4 in | 6.35 | 31.67 mm² · 0.0491 in² | 0.359 kg/m · 0.241 lb/ft |
| 5/16 in | 7.94 | 49.48 mm² · 0.0767 in² | 0.561 kg/m · 0.377 lb/ft |
| 3/8 in | 9.52 | 71.26 mm² · 0.1104 in² | 0.808 kg/m · 0.543 lb/ft |
| 1/2 in | 12.70 | 126.68 mm² · 0.1963 in² | 1.437 kg/m · 0.965 lb/ft |
| 5/8 in | 15.88 | 197.93 mm² · 0.3068 in² | 2.245 kg/m · 1.508 lb/ft |
| 3/4 in | 19.05 | 285.02 mm² · 0.4418 in² | 3.232 kg/m · 2.172 lb/ft |
| 7/8 in | 22.22 | 387.95 mm² · 0.6013 in² | 4.399 kg/m · 2.956 lb/ft |
| 1 in | 25.40 | 506.71 mm² · 0.7854 in² | 5.746 kg/m · 3.861 lb/ft |
| 1-1/4 in | 31.75 | 791.73 mm² · 1.2272 in² | 8.978 kg/m · 6.033 lb/ft |
| 1-1/2 in | 38.10 | 1,140.09 mm² · 1.7671 in² | 12.929 kg/m · 8.688 lb/ft |
| 2 in | 50.80 | 2,026.83 mm² · 3.1416 in² | 22.984 kg/m · 15.445 lb/ft |
| 2-1/2 in | 63.50 | 3,166.92 mm² · 4.9087 in² | 35.913 kg/m · 24.132 lb/ft |
| 3 in | 76.20 | 4,560.37 mm² · 7.0686 in² | 51.715 kg/m · 34.751 lb/ft |
| 4 in | 101.60 | 8,107.32 mm² · 12.5664 in² | 91.937 kg/m · 61.779 lb/ft |
Stock sizes in inches, converted exactly at 25.4 mm per inch. Material: Lead at 11340 kg/m³.
The same round bar in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Lead is highlighted. The percentage column is against carbon steel, which is the figure most quotations are built on.
| Material | Density kg/m³ | lb/in³ | Mass / length kg/m | lb/ft | vs carbon steel |
|---|---|---|---|---|---|
| Carbon Steel | 7,850 | 0.2836 | 3.853 | 2.589 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.927 | 2.639 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.927 | 2.639 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.927 | 2.639 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.780 | 2.540 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.325 | 0.891 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.316 | 0.884 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.379 | 0.927 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 4.388 | 2.949 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 4.172 | 2.804 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 4.320 | 2.903 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 2.214 | 1.488 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.534 | 2.375 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.567 | 3.741 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.687 | 0.462 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.471 | 0.317 | -87.8 % |
Same geometry throughout, so the only variable is density. Carbon steel is highlighted as the baseline.
A note on using this table for costing: mass is not price. Aluminium is roughly a third of steel's mass here, but per kilogram it costs several times more, so a straight swap rarely saves money — what it buys is reduced load on a structure or a vehicle.
About lead
The densest material in the catalogue at 11,340 kg/m³ — 44 % heavier than carbon steel — and used precisely for that. Lead sheet is specified for acoustic and radiation shielding, where the performance metric is mass per unit area, so a sheet weight table is not an incidental output here, it is the design input: 1 mm of lead is about 11.34 kg/m². It is also extremely soft and creeps under sustained load, so it is normally supported, not self-carrying.
- Density
- 11,340 kg/m³ = 0.4097 lb/in³ · 1.4446× carbon steel · typical spread ±1 %
- Specification
- ASTM B29 (UNS L50049, chemical lead)
- Equivalents
- EN PB000 · GB Pb1
- Typical uses
- Radiation shielding · Acoustic and vibration isolation · Roof flashing and damp courses · Battery plates
Heavy-metal hazard: machining, welding and dross handling require controls. Creeps under its own weight at ambient temperature.
About round bar
Round bar is the only shape whose area grows with the square of a single dimension, so small diameter changes move weight much faster than intuition suggests: going from 25 mm to 28 mm — a 12 % diameter increase — raises the weight per metre by 25 %. This is why shaft stock is normally bought to the nearest preferred diameter rather than machined down from the next size up; the material saved is more than the weight table implies.
Specified by diameter only. For ground and polished stock, add the tolerance class and the straightness limit.
Download this data
Lead round bar — CSV
Both buttons below read the tables rendered on this page, so the file matches what you are looking at. The full catalogue — all 16 materials across all 10 sections — is on the downloads page.
Fields are quoted per RFC 4180, with a UTF-8 byte-order mark so Excel reads the mm² and · characters correctly. Blank lines separate the weight matrix from the area matrix.
Frequently asked questions
How much does lead round bar weigh?
At the reference dimensions (d = 25 mm) a lead round bar of this size weighs 5.567 kg/m, or 3.741 lb/ft. The table above lists the figure for every standard size so you can read your size directly instead of scaling.
How is the weight of round bar calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = π/4 · d². At the reference dimensions that gives 490.9 mm², and multiplying by lead's density of 11,340 kg/m³ gives 5.567 kg/m. Nothing is looked up in a table — which is why a non-standard size is calculated just as accurately as a standard one.
Why does lead weigh more or less than steel?
It is heavier than carbon steel for the same section — about 44 % heavier at 11,340 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a round bar of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 1.4446× carbon steel.
What is the cross-sectional area of a round bar?
The area depends only on the dimensions, not on the material, so it is identical whichever material you select: at the reference dimensions it is 490.9 mm² (0.7609 in²). That is the number you would enter into a stress or deflection calculation, and it is why changing material on this page never changes the area column.
Does a lead round bar weigh the same as a lead part of a different shape?
No, and the difference is larger than most people expect. At equal nominal size, a square bar is 27.3 % heavier than a round bar, and a hollow section is typically 60–80 % lighter than the solid bar it replaces. Weight follows area, and area changes faster than dimensions do — which is exactly why this needs calculating rather than estimating.
Should I use Lead weight or carbon steel weight for costing?
Use the material you are actually buying. At 11,340 kg/m³ against carbon steel's 7,850 kg/m³, the same round bar differs by 44.5 % in mass. On a per-metre quote that is invisible; on a fabricated tonnage it is the difference between a margin and a loss. This page computes the steel figure as 3.853 kg/m for comparison.
Other materials, same round bar
The same geometry in every material, so the only variable is density.
- Carbon steel round bar — 7850 kg/m³
- SS 304 round bar — 8000 kg/m³
- SS 316 round bar — 8000 kg/m³
- AL 6061 round bar — 2700 kg/m³
- Copper round bar — 8940 kg/m³
- Brass round bar — 8500 kg/m³
- HDPE round bar — 960 kg/m³
- PVC round bar — 1400 kg/m³
Other Lead sections
The same density applied to every shape the site covers.
- Lead square bar — A = a²
- Lead hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- Lead flat bar — A = w · t
- Lead plate — A = w · t
- Lead round tube — A = π/4 · (D² − d²), d = D − 2t
- Lead square tube — A = a² − (a − 2t)²
Reference data and tools
- Metal weight overview — how the calculation works
- All 16 materials — densities and specifications
- All 10 sections — formulas and size series
- Density chart — lightest to heaviest
- Metal weight calculator — any size, any material
- All calculators — metal weight and pipe weight
- Download the data — CSV, generated from the same source
- Cross-reference tables — DN / NPS / material equivalents
- Methodology and sources — where every number comes from
Round Bar area from A = π/4 · d². Mass computed as area × length × density at 11,340 kg/m³ (ASTM B29 (UNS L50049, chemical lead)). No weight on this page is copied from a published table — which is why figures can differ in the last significant digit from a mill's chart calculated at a nominal density.
- Elementary plane geometry. The circle, polygon and hollow-section area formulas.
- ASTM material specifications for each grade named in the material entry (A36, A240/A276, B209/B211/B221, B152/B16/B505, B265/B348, A48, B29, D1784, D3350).
- BIPM / NIST definitional constants: international inch = 25.4 mm, foot = 0.3048 m, pound = 0.45359237 kg.
Dataset version 2026.09.1 · dimensions last verified against source 2026-09-21. Found an error? Report it — corrections are issued with a version bump.