Copper Wire Weight Calculator
Enter an AWG gauge or a custom wire diameter, pick a length, and get the copper weight instantly. Switch between metric and imperial, add an insulation type to include jacket weight, calculate bundle weight for multiple conductors, or work backwards to find the maximum run length for a given weight budget. A copper price field converts the result into a material cost estimate.
How copper wire weight is calculated
The weight of a copper wire is the product of its cross-sectional area, its length, and the density of copper (8960 kg/m3, or 0.324 lb/in3 in imperial units). For a round conductor the cross-section is simply the circle formula: A = pi * (d/2)^2, where d is the wire diameter. Multiply that area by the run length to get the volume, then multiply by the density to get the mass. In practical imperial units the shortcut is: weight (lb) = 0.324 * pi * (d_in / 2)^2 * length_in, where all measurements are in inches. This calculator does that arithmetic for you and converts the result to pounds or kilograms.
AWG gauge and what the numbers mean
American Wire Gauge (AWG) is the standard North American system for specifying solid copper conductor sizes. Larger AWG numbers mean smaller diameter wire: AWG 4/0 (the largest common size) has a diameter of 0.460 inches (11.68 mm), while AWG 30 (used in fine electronics) is only 0.010 inches (0.25 mm) across. Each step of three AWG sizes halves the cross-sectional area, which also roughly halves the weight per unit length. The calculator covers AWG 4/0 through AWG 30, plus a custom diameter option for metric wire sizes or non-standard conductors.
Insulation types and total cable weight
Bare copper weight is the theoretical floor; real cables carry an insulation jacket that adds 12 to 40 percent more weight depending on the jacket type. THHN/THWN thermoplastic insulation (the thin slippery wire used in conduit) adds about 12 percent. Romex / NM-B sheathed cable, common in residential wiring, adds roughly 25 percent. SOOW and SJOOW flexible rubber cords used for portable equipment and extension leads carry heavy jackets that add around 40 percent. Select the insulation type that matches your cable so the total weight figure is realistic for freight, structural load, or spool weight calculations.
Bundle weight, cost, and reverse solve
Multi-conductor cables contain two or more copper conductors inside a common jacket. Enter the number of conductors to scale the copper weight accordingly. The cost field multiplies bare copper weight in pounds by a spot price - London Metal Exchange copper typically trades between $3 and $6 per pound, and your wire cost will be higher than spot because it includes drawing, annealing, and distribution markup. The reverse-solve mode ("max run length from a weight budget") is useful for structural engineers checking slab or cable-tray load limits: enter the gauge and a maximum allowable weight and the calculator returns the maximum run length that stays within that budget.
Common AWG copper wire - diameter and weight per 1000 ft
| AWG | Diameter (in) | Diameter (mm) | Weight per 1000 ft (lb) | Weight per km (kg) |
|---|---|---|---|---|
| 4/0 | 0.4600 | 11.68 | 641.0 | 954 |
| 2/0 | 0.3648 | 9.27 | 402.8 | 599 |
| 1/0 | 0.3249 | 8.25 | 319.5 | 475 |
| 2 | 0.2576 | 6.54 | 200.9 | 299 |
| 4 | 0.2043 | 5.19 | 126.3 | 188 |
| 6 | 0.1620 | 4.11 | 79.5 | 118 |
| 8 | 0.1285 | 3.26 | 49.9 | 74 |
| 10 | 0.1019 | 2.59 | 31.4 | 47 |
| 12 | 0.0808 | 2.05 | 19.8 | 29 |
| 14 | 0.0641 | 1.63 | 12.4 | 18 |
| 16 | 0.0508 | 1.29 | 7.8 | 12 |
| 18 | 0.0403 | 1.02 | 4.9 | 7 |
| 20 | 0.0320 | 0.81 | 3.1 | 5 |
| 22 | 0.0253 | 0.64 | 1.9 | 3 |
| 24 | 0.0201 | 0.51 | 1.2 | 2 |
| 26 | 0.0159 | 0.40 | 0.77 | 1 |
| 28 | 0.0126 | 0.32 | 0.48 | 1 |
| 30 | 0.0100 | 0.25 | 0.30 | <1 |
Standard ASTM B3 solid copper conductor. Density = 8960 kg/m3 (0.324 lb/in3).
Frequently asked questions
What is the density of copper used in this calculator?
The calculator uses 8960 kg/m3 (0.324 lb/in3), which is the accepted value for pure annealed copper. Commercial conductors are very close to this figure; alloyed or stranded wire can differ slightly. For bare solid AWG copper the error from using this constant is less than one percent.
Why does a larger AWG number mean a thinner wire?
The AWG system grew from wire-drawing practice: the gauge number counted how many drawing passes were made through progressively smaller dies. More passes produced thinner wire, so higher numbers ended up meaning smaller diameter. AWG 4/0 (four-aught) is the largest common building-wire size at 0.460 in (11.68 mm); AWG 30 is fine enough for coils and signal wiring at 0.010 in (0.25 mm).
Does insulation weight matter for structural or freight calculations?
Yes, significantly. A 1000-foot reel of AWG 12 THHN cable weighs about 24 lb when the insulation is included, versus 19.8 lb for bare copper - a 22 percent difference. For heavy cords (SOOW) the gap is 40 percent. If you are calculating spool weight, cable-tray load, or shipping weight, always include insulation.
How do I calculate weight for a multi-conductor cable?
Enter the gauge of one conductor, set the "Number of conductors" field to the actual count, and the calculator multiplies the single-conductor weight by that count. This gives the copper weight for all conductors. Note that the common outer jacket is not included in the insulation factor, which only models the per-conductor insulation layer.
How accurate is the copper cost estimate?
The estimate is the bare copper weight in pounds multiplied by your entered price per pound. It is a rough material cost for the copper metal only. Actual wire prices include a significant markup for drawing, annealing, stranding, insulation, and distribution, so the true purchase price per pound of finished wire is typically two to five times the copper spot price.
Can I use this calculator for aluminum or other wire materials?
This calculator uses the density of copper and is designed for copper conductors. Aluminum wire is about one-third lighter per unit volume (density 2700 kg/m3 versus 8960 kg/m3 for copper), so the weights would be significantly wrong if you applied the copper formula to aluminum. Use a general metal weight calculator with the correct material density for non-copper conductors.