in
What is a Inch?
Length Unit
Definition
An inch is a unit of length equal to 2.54 centimeters or 1/12 of a foot. It is commonly used in the United States, Canada, and the United Kingdom.
Popular Inch Conversions
Most common conversions from Inches
History
The inch was historically defined as the width of a man's thumb or three barleycorns laid end to end. The modern inch was standardized internationally in 1959 as exactly 25.4 millimeters.
Common Uses
- Screen sizes for TVs, monitors, and phones
- Tire and wheel dimensions
- Woodworking and construction
- Rainfall measurements in the US
Fun Facts
TV and monitor sizes are measured diagonally in inches
The inch symbol (″) is called a double prime
An inch of rain equals about 4.7 gallons per square yard
All Inch Conversions
Inches to Meters in → m Inches to Kilometers in → km Inches to Centimeters in → cm Inches to Millimeters in → mm Inches to Miles in → mi Inches to Yards in → yd Inches to Feet in → ft Inches to Nautical Miles in → nmi Inches to Micrometers in → μm Inches to Nanometers in → nm Inches to Light Years in → ly