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Quick, free, online unit converter that converts common units of measurement, along with 77 other converters covering an assortment of units. The site also includes a predictive tool that suggests possible conversions based on input, allowing for easier navigation while learning more about various unit systems. Do a quick conversion: 1 inches = 25.4 millimetres using the online calculator for metric conversions. Check the chart for more details. One inch equals exactly 25.4 millimeters . Millimeter (mm) is a metric unit of length equal to one thousandth of a meter. Millimeters are used worldwide for precise measurements. To convert inches to millimeters, use this simple formula: Millimeters = Inches × 25.4. in to mm ( Inches to Millimeters ) converter. Convert Inch to Millimeter with formula, common lengths conversion, conversion tables and more.