Electrical calculators
Works in your browser. Nothing is uploaded.Wire sizes
Turn an AWG size into mm², kcmil and diameter and back, or measure a wire to find its size.
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Worked out as a solid conductor. A stranded wire of the same size measures a little wider.
mm
Area
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Diameter
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In inches
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kcmil
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Circular mils
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Metric size up
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AWG size up
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AWG sizes
| Size | mm² | Ø mm | Ø in | kcmil | Metric size up |
|---|---|---|---|---|---|
| 0.823 | 1.02 | 0.0403 | 1.62 | 1 mm² | |
| 1.31 | 1.29 | 0.0508 | 2.58 | 1.5 mm² | |
| 2.08 | 1.63 | 0.0641 | 4.11 | 2.5 mm² | |
| 3.31 | 2.05 | 0.0808 | 6.53 | 4 mm² | |
| 5.26 | 2.59 | 0.102 | 10.4 | 6 mm² | |
| 8.37 | 3.26 | 0.128 | 16.5 | 10 mm² | |
| 13.3 | 4.12 | 0.162 | 26.3 | 16 mm² | |
| 21.2 | 5.19 | 0.204 | 41.7 | 25 mm² | |
| 26.7 | 5.83 | 0.229 | 52.6 | 35 mm² | |
| 33.6 | 6.54 | 0.258 | 66.4 | 35 mm² | |
| 42.4 | 7.35 | 0.289 | 83.7 | 50 mm² | |
| 53.5 | 8.25 | 0.325 | 106 | 70 mm² | |
| 67.4 | 9.27 | 0.365 | 133 | 70 mm² | |
| 85.0 | 10.4 | 0.410 | 168 | 95 mm² | |
| 107 | 11.7 | 0.460 | 212 | 120 mm² |
Metric sizes
| Size | mm² | Ø mm | Ø in | kcmil | AWG size up |
|---|---|---|---|---|---|
| 0.75 | 0.977 | 0.0385 | 1.48 | 18 AWG | |
| 1 | 1.13 | 0.0444 | 1.97 | 16 AWG | |
| 1.5 | 1.38 | 0.0544 | 2.96 | 14 AWG | |
| 2.5 | 1.78 | 0.0702 | 4.93 | 12 AWG | |
| 4 | 2.26 | 0.0888 | 7.89 | 10 AWG | |
| 6 | 2.76 | 0.109 | 11.8 | 8 AWG | |
| 10 | 3.57 | 0.140 | 19.7 | 6 AWG | |
| 16 | 4.51 | 0.178 | 31.6 | 4 AWG | |
| 25 | 5.64 | 0.222 | 49.3 | 3 AWG | |
| 35 | 6.68 | 0.263 | 69.1 | 1 AWG | |
| 50 | 7.98 | 0.314 | 98.7 | 1/0 AWG | |
| 70 | 9.44 | 0.372 | 138 | 3/0 AWG | |
| 95 | 11.0 | 0.433 | 187 | 4/0 AWG | |
| 120 | 12.4 | 0.487 | 237 | – | |
| 150 | 13.8 | 0.544 | 296 | – | |
| 185 | 15.3 | 0.604 | 365 | – | |
| 240 | 17.5 | 0.688 | 474 | – | |
| 300 | 19.5 | 0.769 | 592 | – |
Electrical calculators
Resistor color codeBands to ohms and back.Ohm’s law and powerVolts, amps, ohms and wattsVoltage drop and cable sizeThe drop over a run, and the smallest cable within itWire sizesAWG, mm², kcmil and diameterLED resistorThe resistor an LED needsSMD codesResistor and capacitor markings555 timerAstable and monostableBattery runtimeHow long a battery lasts
How to use it
- Pick a size
From the AWG or metric list, or tap a row of the chart.
- Or measure it
Type the diameter of the bare conductor in millimetres.
- Read every unit
Area, diameter and kcmil, and the next AWG and metric sizes up.
Tips
- Measure the metal
Strip a short end and measure the bare wire, not the insulation.
- Stranded wire
Strands leave gaps, so a stranded wire measures a little wider than a solid one of the same size.
- Changing systems
Going from AWG to metric or back, take the next size up, never the one below.
In the app
Electrical calculator in Angle Meter
- Pick a size or measure a diameter
- Voltage drop and the smallest cable within it
- Loop impedance and motor current
- Wire colors, plugs, IP and NEMA references
Get it onGoogle PlayComing soon to the App Store
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