Wire Gauge Calculator is a handy tool that determines the resistance per unit length, diameter and cross-section area for the given wire material. Enter gauge type, and wire material details in the input sections and click on the calculate button to check the output within no time.

**Wire Gauge Calculator: **Do you want to calculate the
electrical resistance per unit length of a wire? If so, you have arrived
at the correct place. Here we will explain all about the wire gauge, its
types, formula and steps to find wire gauge size & resistance. Read on
to learn about the AWG formulas, SWG chart and solved example questions
on it. Explore and learn about the concept.

The following is the step by step process of calculating the wire diameter, resistance and cross-sectional area easily.

- Obtain the diameter of the wire.
- Square the diameter and multiply it by π/4 to get the area.
- Divide the resistivity of the wire by the area to check the electrical resistance per unit length.

The American wire gauge is a logarithmic wire gauge system and it is used to specify the jewelry size. The AWG numbers are inversely proportional to the diameter and cross-sectional area of the wire. The AWG wire gauge system scale is defined in terms of diameter.

The difference in the diameter of each successive gauge is a constant
ratio of 93^{1/39}. The formulas for wire diameter and
cross-sectional area are along the lines.

Diameter = 0.005 inch x 92^{(36-n)/39}

diameter = 0.127 mm x 92^{(36-n)/39}

Area = (π/4) x diameter²

Area = 0.000019635 inch^{2} x 92^{(36-n)/19.5}

area = 0.012668 mm^{2} x 92^{(36-n)/19.5}

**Standard Wire Gauge (SWG):**

This SWG is used to define the thickness of guitar strings and some types of electrical wiring.

The SWG wire gauge chart is as follows:

SWG Gauge | Diameter (in) | Diameter (mm) | Step (in) |
---|---|---|---|

7/0 | 0.5 | 12.7 | 0.036 |

6/0 | 0.464 | 11.786 | 0.032 |

5/0 | 0.432 | 10.973 | 0.032 |

4/0 | 0.4 | 10.16 | 0.028 |

3/0 | 0.372 | 9.449 | 0.024 |

2/0 | 0.348 | 8.839 | 0.024 |

0 | 0.324 | 8.23 | 0.024 |

1 | 0.3 | 7.62 | 0.024 |

2 | 0.276 | 7.01 | 0.024 |

3 | 0.252 | 6.401 | 0.02 |

4 | 0.232 | 5.893 | 0.02 |

5 | 0.212 | 5.385 | 0.02 |

6 | 0.192 | 4.877 | 0.016 |

7 | 0.176 | 4.47 | 0.016 |

8 | 0.16 | 4.064 | 0.016 |

9 | 0.144 | 3.658 | 0.016 |

10 | 0.128 | 3.251 | 0.012 |

11 | 0.116 | 2.946 | 0.012 |

12 | 0.104 | 2.642 | 0.012 |

13 | 0.092 | 2.337 | 0.012 |

14 | 0.08 | 2.032 | 0.008 |

15 | 0.072 | 1.829 | 0.008 |

16 | 0.064 | 1.626 | 0.008 |

17 | 0.056 | 1.422 | 0.008 |

18 | 0.048 | 1.219 | 0.008 |

19 | 0.04 | 1.016 | 0.004 |

20 | 0.036 | 0.914 | 0.004 |

21 | 0.032 | 0.813 | 0.004 |

22 | 0.0028 | 0.711 | 0.004 |

23 | 0.0024 | 0.61 | 0.002 |

24 | 0.022 | 0.559 | 0.002 |

25 | 0.02 | 0.508 | 0.002 |

26 | 0.018 | 0.4572 | 0.016 |

27 | 0.0164 | 0.4166 | 0.016 |

28 | 0.0148 | 0.3759 | 0.0012 |

29 | 0.0136 | 0.3454 | 0.0012 |

30 | 0.0124 | 0.315 | 0.0008 |

31 | 0.0116 | 0.2946 | 0.0008 |

32 | 0.0108 | 0.2743 | 0.0008 |

33 | 0.01 | 0.254 | 0.0008 |

34 | 0.0092 | 0.2337 | 0.0008 |

35 | 0.0084 | 0.2134 | 0.0008 |

36 | 0.0076 | 0.193 | 0.0008 |

37 | 0.0068 | 0.1727 | 0.0008 |

38 | 0.006 | 0.1524 | 0.0008 |

39 | 0.0052 | 0.1321 | 0.0004 |

40 | 0.0048 | 0.1219 | 0.0004 |

41 | 0.0044 | 0.1118 | 0.0004 |

42 | 0.004 | 0.1016 | 0.0004 |

43 | 0.0036 | 0.0914 | 0.0004 |

44 | 0.0032 | 0.0813 | 0.0004 |

45 | 0.0028 | 0.0711 | 0.0004 |

46 | 0.0024 | 0.061 | 0.0004 |

47 | 0.002 | 0.508 | 0.0004 |

48 | 0.0016 | 0.0406 | 0.0002 |

49 | 0.0012 | 0.0305 | 0.0002 |

50 | 0.001 | 0.0254 | 0.0002 |

The electrical resistance per unit length is nothing but the wire resistance in one unit length of the wire. Get the fundamental property of the electrical conductor material that forms the wire resistivity. The equation to find the wire resistivity is

ρ = R x (A/l)

The resistance per unit length of the wire is

R/l = ρ/A

Where,

R is the electrical resistance

A is the cross-sectional area of the wire

l is the wire length

Physicscalc.Com has got concepts like friction, acceleration due to gravity, water pressure, gravity, and many more along with their relevant calculators all one under one roof.

** 1. What are the types of wire gauges?**

The two different types of the gauge are American Wire Gauge (AWG) and Standard Wire Gauge (SWG).

**2. What is the formula to calculate the electrical resistance per
unit length?**

Divide the resistivity of the wire by the cross-sectional area to check the resistance per unit length. The formula is R/l = ρ/A.

**3. How to use a wire gauge size calculator?**

Choose either AWG or SWG as the wire gauge type and wire material type. And hit on the calculate button to get the result. The result has the diameter, cross-sectional area and electrical resistance per length of the wire.

**4. How to gauge a wire?**

The three simple methods to gauge a wire is stripping insulation, gauging round solid wire and gauging standard wire.