Convert inches (in) to centimeters, millimeters, feet, meters, and other length units.
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The inch (in) is a unit of length in the British Imperial system. Historically, it equaled the width of an adult man's thumb. By modern definition, 1 inch is exactly 25.4 mm.
Common Inch Conversions
- 1 in = 25.4 mm — exact value by definition.
- 1 in = 2.54 cm — one inch equals two and a half centimeters.
- 1 in ≈ 0.0833 ft — twelve inches equal one foot.
- 1 in ≈ 0.0254 m — multiply by 0.0254 to convert to meters.
- 12 in = 1 ft — for easy comparison.
Inches are widely used in electronics — screen sizes for TVs, monitors, and smartphones are traditionally measured diagonally in inches. They are also common in construction and woodworking in the US and the UK.