# Copper Wire Weight Calculator

URL: https://speedycalculator.com/calculators/physics/copper-wire-weight/
Last updated: 2026-10-30

> The copper wire weight calculator finds the weight of copper (or brass, aluminium and other) wire or bar of round, square, rectangular or hexagonal section from its dimensions and length.

## Inputs

- Shape
- Alloy
- Custom density (kg/m³, g/cm³, g/mL, lb/ft³, lb/in³)
- Diameter / side / across flats (mm, cm, m, in, µm)
- Width (mm, cm, m, in, µm)
- Height (mm, cm, m, in, µm)
- Length L (m, cm, mm, km, in, ft, yd, mi)

## Results

- Cross-section area
- Weight
- Weight per metre

## Formula

```
m = ρ·A·L,  A = πd²/4 (round), a² (square), w·h (rectangle), (√3/2)·f² (hexagon across flats)
```

## Explanation

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

FieldWhat to enterShapeChoose one: Round wire, Square bar, Rectangular bar, Hexagonal barAlloyChoose one: Copper, Brass, Bronze, Aluminium …Custom densityUnits: kg/m³, g/cm³, g/mL, lb/ft³, lb/in³Diameter / side / across flatsUnits: mm, cm, m, in, µmWidthUnits: mm, cm, m, in, µmHeightUnits: mm, cm, m, in, µmLength LUnits: 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)4,4804.39826,7204.39828,9604.398211,2004.398213,4404.398217,9204.3982

## 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.

## FAQ

**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.


## Sources

- [OpenStax – University Physics Volume 1](https://openstax.org/details/books/university-physics-volume-1)
- [The Engineering ToolBox](https://www.engineeringtoolbox.com/)