How to convert inches to centimeters
To convert a measurement in inches to centimeters, multiply the value by 2.54. The conversion factor comes from the relationship between both units and the meter (the SI base unit of length).
For example, to convert 5 in to centimeters: 5 × 2.54 = 12.7 cm.
What is a inch?
An inch is an imperial unit of length equal to 1/12 of a foot or exactly 25.4 millimeters. Originally defined as the width of a man's thumb, later standardized as three barleycorns laid end to end. Since 1959, defined internationally as exactly 25.4 mm.
Common uses of inches include: Screen and display sizes (TV, phone, monitor diagonals); Screw, bolt, and pipe sizing; Tire rim diameter specifications; Woodworking and carpentry precision.
What is a centimeter?
A centimeter is a metric unit of length equal to one hundredth of a meter (0.01 m) or approximately 0.394 inches. Introduced as part of the metric system in 1795, the centimeter is derived from the Latin 'centum' (hundred). It remains widely used in everyday measurements despite the SI preference for meters.
Common uses of centimeters include: Human height measurement in most countries; Clothing and body measurements; Screen sizes and display dimensions; Medical measurements (wound size, tumor size).
When you need to convert inches to centimeters
Medical records, international shipping dimensions, and recipe measurements from US sources often need converting to centimeters for use in metric countries.
Inches to centimeters worked examples
Here are some common values converted:
1 in = 2.54 cm 5 in = 12.7 cm 10 in = 25.4 cm 50 in = 127 cm 100 in = 254 cm
Frequently asked questions
How many centimeters are in one inch?
One inch (in) equals 2.54 centimeters (cm). Multiply any value in inches by 2.54 to convert to centimeters.
How do I convert inches to centimeters?
Multiply the value in inches by 2.54. For example, 5 in × 2.54 = 12.7 cm.
How do I convert centimeters to inches?
Multiply the value in centimeters by 0.3937007874, or divide by 2.54. Use the swap button on the converter above to reverse the direction.
Is the inch to centimeter conversion exact?
Yes, the conversion is exact. Since 1959, one inch is defined as exactly 25.4 mm (the international yard and pound agreement), so all metric-imperial length conversions use exact factors.
What is the formula for inches to centimeters?
The formula is: cm = in × 2.54. This is derived from the definition of both units relative to the meter (the SI base unit of length).