Wire resistance calculator
Online calculator for formulas used in electronic circuit design and electrical engineering.Basic electric calculations:
Ohm's Law,
Ohm's Law with power,
DC power,
AC real power,
LC resonant frequency,
Capacitor charging/discharging,
Capacitive reactance,
Capacitive current + reactive power,
Capacitor energy,
Capacitor Δ energy,
RC discharging,
Inductor square pulse,
Inductive reactance,
Inductive current + reactive power,
Inductor energy,
2 parallel resistors,
3 parallel resistors
Wire and winding calculations:
Calculate Wire resistance: mm, 2mm2, 30m, Ω, copper
This can calculate the wire or conductor resistance (R) knowing its diameter (d) or cross section area (A) and the length (ℓ). It can also calculate the diameter and cross section area knowing the resistance and length. You can also calculate the wire length knowing its diameter or cross section area and the resistance. Works for copper, aluminium and iron. A=π•d2/4 d=2•√A/π R=ρ•ℓ/A R=ℓ/(A•σ)
Enter 2 values to calculate the other 2:
Standard metric enamelled magnet copper wire diameters:
0.018 mm, 0.02 mm, 0.022 mm, 0.025 mm, 0.028 mm, 0.032 mm, 0.036 mm, 0.04 mm, 0.045 mm, 0.05 mm, 0.056 mm, 0.063 mm, 0.071 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.112 mm, 0.12 mm, 0.125 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.224 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.315 mm, 0.32 mm, 0.35 mm, 0.355 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.56 mm, 0.6 mm, 0.63 mm, 0.7 mm, 0.71 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, 1.1 mm, 1.12 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.63 mm, 1.7 mm, 1.8 mm, 2 mm, 2.24 mm, 2.5 mm, 2.8 mm, 3.15 mm, 3.55 mm, 4 mm, 4.5 mm, 5 mm,Standard metric electrical wire cross sections (aluminium or copper):
0.08 mm², 0.14 mm², 0.22 mm², 0.25 mm², 0.34 mm², 0.35 mm², 0.5 mm², 0.75 mm², 0.85 mm², 1 mm², 1.5 mm², 2.5 mm², 4 mm², 6 mm², 8 mm², 10 mm², 16 mm², 25 mm², 35 mm², 50 mm², 70 mm², 95 mm², 120 mm², 150 mm², 185 mm², 240 mm², 300 mm², 400 mm², 500 mm², 630 mm²,Standard American wire gauge (AWG) wire gauges:
Will be converted to diameter in mmAWG 6/0, AWG 5/0, AWG 0000, AWG 000, AWG 00, AWG 0, AWG 1, AWG 2, AWG 3, AWG 4, AWG 5, AWG 6, AWG 7, AWG 8, AWG 9, AWG 10, AWG 11, AWG 12, AWG 13, AWG 14, AWG 15, AWG 16, AWG 17, AWG 18, AWG 19, AWG 20, AWG 21, AWG 22, AWG 23, AWG 24, AWG 25, AWG 26, AWG 27, AWG 28, AWG 29, AWG 30, AWG 31, AWG 32, AWG 33, AWG 34, AWG 35, AWG 36, AWG 37, AWG 38, AWG 39, AWG 40,
Wire materials:
Copper: the best conductor of all non-precious metals. Its chemical symbol is Cu. Typical conductivity of a copper wire is about 57 MS/m and the resistivity about 17.54 nΩ⋅m. Density: 8.96 g/cm³. Linear thermal expansion: 16.7um/(m⋅K).Aluminium: cheaper and lighter than copper, good conductivity. Its chemical symbol is Al. Typical conductivity of an aluminium wire is about 35.5 MS/m and the resistivity about 28.2 nΩ⋅m. Density: 2.70 g/cm³. Linear thermal expansion: 23.1um/(m⋅K).
Iron: very cheap, works as both a conductor and a structural part. Its chemical symbol is Fe. Typical conductivity of iron is about 10.3 MS/m and the resistivity about 97.1 nΩ⋅m. Density: 7.874 g/cm³. Linear thermal expansion: 11.8um/(m⋅K).
Wire resistance formula says:
•A 1.595769121606 mm (millimeters) diameter wire has a 2 mm² (square millimeters) cross section area. If such copper (Cu) wire is 30m (meters) long, its resistance is 263.1578947368mΩ (milliohms).•If a 30m (meters) long copper (Cu) wire has 263.1578947368mΩ (milliohms) resistance, its diameter is 1.595769121606 mm (millimeters) and its cross section area is 2 mm² (square millimeters).
•A 1.595769121606 mm (millimeters) diameter / 2 mm² (square millimeters) cross section area copper (Cu) wire with a 263.1578947368mΩ (milliohms) resistance is 30m (meters) long.
This is a simple online calculator for formulas used in electronic engineering and design.
This online calculator is for reference only. I do not guarantee it to work correctly. You use this at your own risk only.