Inches to CM Converter

1. Enter the number of inches you want to convert in the input field.
2. The equivalent value in centimeters appears instantly in the result field.
3. Use the copy button to copy the result to your clipboard.
4. Refer to the conversion table below for common inch-to-centimeter values.

What is Inches to Centimeters Conversion?

Inches to centimeters conversion transforms imperial length measurements into the metric system used internationally. The inch is an imperial unit primarily used in the United States, while the centimeter is part of the SI (International System of Units) used by the vast majority of countries worldwide. Since 1959, the inch has been defined by international agreement as exactly 25.4 millimeters (2.54 centimeters), making this one of the few unit conversions that is mathematically exact rather than approximate.

The Conversion Formula

The formula is: cm = inches x 2.54. This conversion factor is exact and was established by an international agreement between the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa. For quick mental math, multiply by 2.5 for a rough estimate that is about 1.6% too low. For example, 6 inches x 2.5 = 15 cm (exact answer is 15.24 cm). For fractional inches common in US measurements, convert the fraction to decimal first: 5/8 inch = 0.625 inches x 2.54 = 1.5875 cm.

Common Use Cases

• Converting TV, monitor, and phone screen sizes (measured diagonally in inches)
• Translating US clothing sizes and body measurements to metric
• Converting height from feet and inches to centimeters for international forms
• Adapting US construction and woodworking measurements for metric tools
• Converting drill bit, bolt, and hardware sizes for international standards
• Interpreting US paper sizes (Letter: 8.5 x 11 inches = 21.59 x 27.94 cm)

Screen Size Conversions

Screen sizes are universally measured in inches (diagonally), even in metric countries. Common screen sizes and their centimeter equivalents include: 5 inches = 12.7 cm (small smartphone), 6.5 inches = 16.51 cm (large smartphone), 13 inches = 33.02 cm (laptop), 24 inches = 60.96 cm (desktop monitor), 27 inches = 68.58 cm (large monitor), 55 inches = 139.7 cm (TV), and 65 inches = 165.1 cm (large TV). Note that screen size measured diagonally does not tell you the exact width and height, which depend on the aspect ratio (typically 16:9 for TVs and monitors, or various ratios for smartphones).

For the reverse conversion, use the Centimeters to Inches Converter. For larger length conversions, try Feet to Meters or Miles to Kilometers.