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AWG⇔直径・断面積
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Quick Answer
AWG (American Wire Gauge) is a logarithmic scale where lower numbers = thicker wire. The formula d(mm) = 0.127 × 92^((36-AWG)/39) converts any gauge to diameter. Each 3 AWG steps doubles the cross-sectional area and halves the resistance.
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Calculadora de Bitola de Fio
Converta entre AWG e mm2 metrico.
Design Notes
AWG is used throughout North America while IEC metric sizes (mm²) are standard in Europe and Asia. There is no exact 1:1 mapping between the systems. For current-carrying capacity, always consult your local electrical code (NEC in the US, IEC 60364 internationally) as ampacity depends on installation conditions.
Common Mistakes
- 1
Thinking higher AWG = thicker wire. It is the OPPOSITE: AWG 10 is much thicker than AWG 24.
- 2
Using the same ampacity rating for wire in conduit vs free air — bundled wires must be derated significantly.
- 3
Ignoring voltage drop for long wire runs — even if the wire can handle the current, the voltage drop may be excessive.
Engineering Handbox
1. d(inches) = 0.005 × 92^((36-12)/39) = 0.0808 in 2. d(mm) = 0.127 × 92^0.615 = 2.053 mm 3. Area = π/4 × 2.053² = 3.31 mm² 4. Ampacity (NEC): 20A in 60°C insulation
Knowledge Base
AWG番号が大きいほど太い？
いいえ、逆です。AWG 10（2.59mm）はAWG 24（0.51mm）よりはるかに太い。
AWG→mmの計算式は？
d(mm) = 0.127 × 92^((36-AWG)/39)。3 AWGステップで断面積が約2倍。
15Aに必要なAWGは？
AWG 14が最低基準（米国NEC）。20A：AWG 12。30A：AWG 10。長距離ではサイズアップ。
メートル法の対応は？
AWG 10≈6mm²、12≈4mm²、14≈2.5mm²、18≈1.0mm²。IEC規格（mm²）が北米以外の世界標準。
単線とより線の違いは？
同じAWG = 同じ断面積 = 同じ抵抗 = 同じ許容電流。より線は柔軟、単線は形状保持に優れる。