Electricians, jewellers and scrap dealers often need the weight of a coil or length of wire. Knowing the cross-section and the alloy density gives the mass directly.
How to use the Copper Wire Weight Calculator
- Shape
- Alloy
- Custom density
- Diameter / side / across flats
- Width
- Height
- Length L
Results update as you type, every field has its own unit menu, and everything is calculated in your browser.
How it works
Choose the shape and the alloy, then enter the dimensions and length.
Inputs explained
| Field | What to enter |
|---|---|
| Shape | Choose one: Round wire, Square bar, Rectangular bar, Hexagonal bar |
| Alloy | Choose one: Copper, Brass, Bronze, Aluminium … |
| Custom density | Units: kg/m³, g/cm³, g/mL, lb/ft³, lb/in³ |
| Diameter / side / across flats | Units: mm, cm, m, in, µm |
| Width | Units: mm, cm, m, in, µm |
| Height | Units: mm, cm, m, in, µm |
| Length L | Units: m, cm, mm, km, in, ft … |
Example values
How the main result changes when Custom density changes and everything else stays at the example values above:
| Custom density (kg/m³) | Weight (kg) |
|---|---|
| 4,480 | 4.3982 |
| 6,720 | 4.3982 |
| 8,960 | 4.3982 |
| 11,200 | 4.3982 |
| 13,440 | 4.3982 |
| 17,920 | 4.3982 |
Formula
m = ρ·A·L, A = πd²/4 (round), a² (square), w·h (rectangle), (√3/2)·f² (hexagon across flats)
Worked example
Inputs — Shape: Round wire; Alloy: Copper; Diameter / side / across flats: 2.5 mm; Length L: 100 m.
Results — Cross-section area = 4.90874 mm²; Weight = 4.39823 kg; Weight per metre = 43.9823 g/m.
Key terms
- Cross-section
- The area of a slice through the wire.
Frequently asked questions
How much does 100 m of 2.5 mm² copper weigh?
About 2.2 kg (conductor only).
Does insulation count?
No – this is the bare metal weight.
What is the density of copper?
About 8.96 g/cm³.
How do I get the wire diameter from AWG?
Use our AWG converter, then enter the diameter.