Copper Wire Weight Calculator
Calculate copper wire mass from diameter, length, and density, with results in kilograms, grams, and pounds.
Wire mass calculator
Enter round-wire dimensions in millimetres and metres. Pure copper density defaults to 8.96 g/cm³.
About copper wire weight
Copper wire weight is determined by geometry and material density. For a solid round conductor, cross-sectional area equals pi times the square of half the diameter. Multiplying that area by wire length gives volume, and multiplying volume by density gives mass. This calculator performs those steps after converting millimetres, metres, and grams per cubic centimetre into a consistent SI calculation.
Pure copper has a commonly used density of about 8.96 grams per cubic centimetre at room temperature. The default suits ordinary solid copper estimates. Copper alloys, plated wire, unusually porous material, or conductors with significant impurities can have different densities, so the density field remains editable. Manufacturer data is preferable when purchasing, shipping, or costing a specific product.
Diameter has a squared effect on weight. Doubling diameter multiplies cross-sectional area and mass per unit length by four, while doubling length simply doubles total mass. This makes accurate diameter entry especially important. Do not confuse diameter with radius: the formula divides diameter by two before squaring. A small diameter measurement error can create a noticeably larger mass error.
The calculation assumes a solid circular copper conductor. Stranded cable contains many smaller wires plus air gaps, insulation, shielding, fillers, and jackets. Its overall outside diameter cannot be inserted as though the entire cable were solid copper. For stranded conductors, use the sum of the metallic cross-sectional areas or consult the cable maker's mass-per-length specification. Hollow tubes and rectangular bus bars also require their own area formulas.
Unit conversion is another common source of mistakes. The calculator treats diameter as millimetres and length as metres. It converts diameter to metres, computes cubic metres, and converts density to kilograms per cubic metre. Results are then displayed in kilograms, grams, and pounds. For example, 2.5 mm solid copper wire over 100 m has a mass of approximately 4.398 kg.
Electrical contractors can estimate reel handling loads, manufacturers can forecast copper consumption, and buyers can compare material costs using this result. It is also useful for classroom density exercises and inventory checks. Real reels may differ because of diameter tolerance, alloy composition, coatings, connectors, and insulation. Use the computed value as an engineering estimate and verify critical lifting, shipping, and procurement decisions against measured or certified product data.
Copper wire weight examples
| Wire dimensions | Estimated mass | Use case |
|---|---|---|
| 1.78 mm diameter, 50 m, 8.96 g/cm³ | 1.115 kg | A household solid-copper conductor estimate. |
| 5.0 mm diameter, 200 m, 8.96 g/cm³ | 35.186 kg | An industrial solid power conductor. |
| 0.5 mm diameter, 10 m, 8.96 g/cm³ | 17.593 g | A small electronics wire. |
How to calculate copper wire weight
- Measure the solid copper conductor diameter and enter it in millimetres.
- Enter the total wire length in metres.
- Keep 8.96 g/cm³ for pure copper or enter the material's specified density.
- Select Calculate and use the mass unit appropriate for your task.
Copper wire weight FAQ
What density should I use for copper?
A standard room-temperature estimate is 8.96 g/cm³. Use a supplier's certified value when alloy composition or precision matters.
Can I use the cable outside diameter?
Only when the entire cross-section is solid copper. Insulated or stranded cable includes non-copper material and voids, so its outside diameter overstates copper mass.
Why does diameter affect weight so strongly?
Area depends on diameter squared. A twofold increase in diameter therefore produces four times the copper mass for the same length.
Does the calculator include insulation?
No. It calculates only a solid round conductor from copper density. Add insulation and jacket mass from manufacturer specifications.
Is mass the same as weight?
The displayed kilograms, grams, and pounds are mass units, although trade usage often calls them weight. Actual force weight depends on local gravitational acceleration.