Wire Size Calculator

Calculator for determining wire size based on current and conductor material.

Calculation Results:

Minimum cross-section by current
Minimum cross-section by current (formula method)
Minimum cross-section by voltage drop
Recommended cross-section

About the Calculator

This calculator helps determine the necessary wire cross-section for an electrical circuit. The calculation is based on:

  • Current value
  • Circuit voltage
  • Cable length
  • Acceptable voltage drop

In simple mode, standard parameters are used: cable length 1m, acceptable voltage drop 5%. In advanced mode, you can customize all parameters yourself.

The cross-section by current is calculated in two ways:

  • По таблицам AWG (рекомендуемый способ)
  • Using the formula S = I / j, where j is the allowable current density (8 A/mm² for copper)

Reference Information

Wire Cross-sections and Characteristics (AWG)

Different wire cross-sections are used for various electrical circuits. Below is a table with standard AWG sizes and their characteristics:

AWG Cross-section (mm²) Number of conductors Conductor diameter (mm) Insulation thickness (mm) Resistance (Ω/km) Maximum current (A)
30 0.006 11/0.08 0.30 0.05 331 0.8
28 0.08 16/0.08 0.32 0.08 227 1.2
26 0.14 30/0.08 0.44 0.15 123 3.5
24 0.20 40/0.08 0.58 0.20 97 5.0
22 0.33 60/0.08 0.72 0.30 88 8.7
20 0.50 100/0.08 0.92 0.50 62 13
18 0.75 150/0.08 1.20 0.55 39 22
16 1.27 252/0.08 1.53 0.80 24 35
14 2.07 400/0.08 1.75 0.90 15 55
13 2.50 500/0.08 2.20 0.90 12 67
12 3.40 680/0.08 2.50 1.0 9.0 88
11 4.20 900/0.08 3.0 1.2 6.3 140
10 5.30 1050/0.08 2.75 1.2 7.8 125
8 8.29 1650/0.08 4.4 1.2 4.0 190
7 12.08 2400/0.08 4.60 1.20 1.2 205
6 16.08 3200/0.08 5.20 1.65 1.2 230

* AWG (American Wire Gauge) - American wire sizing system. The larger the AWG number, the smaller the wire diameter.