Copper Wire Weight Calculator

About the Copper Wire Weight Calculator

Knowing the weight of copper wire is useful when planning conduit loads, cable trays, shipping, and material takeoffs. Wire mass depends on conductor diameter, gauge, length, and copper density, so long runs can add up quickly.

The calculator supports both AWG selection and custom diameter entry. It computes total weight, linear weight, cross-sectional area, approximate DC resistance, and estimated material cost. The built-in AWG table makes it easy to compare common wire sizes without leaving the page.

When This Page Helps

Use this calculator when you need a quick weight estimate for a specific wire size and length. It helps with tray loading, reel planning, freight estimates, scrap handling, and rough copper-cost checks.

Because it also shows resistance, it can double as a rough sanity check for long-run voltage-drop planning.

How to Use the Inputs

1. Select an AWG gauge from the dropdown or switch to custom diameter mode.
2. Choose the length unit (meters, feet, kilometers, or miles).
3. Enter the total wire length.
4. View the total weight, linear weight, resistance, and cost estimate.
5. Use the AWG reference table to compare wire gauges.
6. Try different presets for common wire-run scenarios.

Example Calculation

Tips & Best Practices

• For cable tray loading, multiply bare copper weight by 1.2–1.5 to account for insulation and jacket.
• A 1000-foot roll of #12 AWG copper weighs about 9.0 kg (20 lb).
• Stranded wire has the same cross-sectional copper area as solid wire of the same gauge (by definition).
• For three-phase circuits, total copper weight is 3× single-conductor weight.
• Voltage drop over long runs: if resistance × current > 3% of voltage, upsize the wire gauge.
• Scrap copper value roughly equals 80–90% of commodity price for clean, bare wire.

AWG System Explained

The American Wire Gauge system was standardized in 1857 and remains the primary wire sizing system in North America. The system defines wire diameters from #0000 (4/0, 11.684 mm) down to #40 (0.0799 mm). The progression follows a geometric series where diameter decreases by a factor of 0.8905 per gauge number.

Key relationships: every 3 gauges doubles the cross-sectional area (and thus the weight per meter and current capacity). Every 6 gauges doubles the diameter. Every 10 gauges increases resistance by a factor of 10.

Copper Properties

| Property | Value | |---|---| | Density | 8,960 kg/m³ | | Resistivity (20 °C) | 1.72 × 10⁻⁸ Ω·m | | Temp coefficient | +0.00393 /°C | | Melting point | 1,085 °C | | Thermal conductivity | 401 W/(m·K) | | Tensile strength (annealed) | 210 MPa |

Why Copper for Electrical Wire?

Copper is the standard conductor material because it offers the best combination of low resistivity, high ductility, good corrosion resistance, and solderability. Only silver has lower resistivity (1.59 vs 1.72 × 10⁻⁸ Ω·m), but at dramatically higher cost. Aluminum, while lighter and cheaper, requires larger cross-sections and special connectors to match copper performance.

Frequently Asked Questions

• How does AWG numbering work?

  AWG is based on the number of drawing steps from a standard rod. Each step reduces diameter by a constant ratio (≈0.8905). Every 3 gauges halves the area; every 6 gauges halves the diameter.

• Does insulation add significant weight?

  For standard THHN/THWN residential wire, insulation adds 10–30% depending on gauge. Larger wires have proportionally thinner insulation, so the addition is smaller percentage-wise.

• What is the current price of copper?

  Copper commodity prices fluctuate; as of recent years, raw copper is typically $7–10 per kg. Finished wire costs 2–4× more than raw copper due to drawing, insulation, and distribution.

• How accurate is the resistance calculation?

  The calculator uses copper resistivity at 20 °C. At higher temperatures, resistance increases by about 0.39% per °C. Stranded wire has slightly higher resistance than solid due to air gaps.

• Can I use this for aluminum wire?

  No—aluminum has a density of 2,700 kg/m³ (about 30% of copper) and higher resistivity. For aluminum wire, multiply the copper weight by 0.301 and multiply resistance by 1.61.

• What gauge is used in typical home wiring?

  #14 AWG for 15-amp circuits, #12 for 20-amp, #10 for 30-amp, #8 for 40-amp, and #6 for 60-amp circuits. Service entrance cables are typically #4 to #2/0.