長さ 単位変換ツール
メートル法とヤード・ポンド法
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Quick Answer
1 inch = 25.4 mm exactly. 1 foot = 0.3048 m. 1 mile = 1.609 km. Each conversion between metric and imperial length uses exact definitions established by international agreement in 1959.
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Calculadora de Conversao de Comprimento
Converta entre unidades de comprimento.
Design Notes
PCB design commonly uses mils (thousandths of an inch) for trace width and via diameter, while board dimensions may be in mm. The exact definition (1 inch = 25.4 mm) ensures zero conversion error between systems.
Common Mistakes
- 1
Confusing mils (thousandths of an inch) with millimeters — 1 mil = 0.0254 mm, not 1 mm.
- 2
Forgetting that yards and meters are close but NOT equal: 1 yard = 0.9144 m (about 9% shorter).
- 3
Using different precision than the measurement justifies — a ruler measurement to 1 mm does not justify 6 decimal places after conversion.
Knowledge Base
1インチは何mm？
正確に25.4mm。1959年制定の国際標準。
milとは？
1 mil = 0.001インチ = 0.0254mm = 25.4µm。PCBパターン幅や精密加工に使用。
1メートルは何フィート？
3.28084フィート。1フィート = 0.3048m（正確値）。
PCBで使う単位は？
基板サイズ：mm。パターン幅：milまたはmm。部品ピッチ：mm（0.5, 1.27, 2.54mm）。
変換の精度は？
入力の精度に合わせる。定規で1mm → 変換後は有効数字3桁まで。