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Inch Conversion Reference Tables
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Inches — Fraction to Decimal
What Is an Inch?
An inch is a unit of length in the imperial and United States customary measurement systems. It is defined as exactly 1/12 of a foot or 1/36 of a yard. Since 1959, the inch has been defined as exactly 25.4 millimeters.
The symbol for inch is in or the double prime mark (″). Inches are widely used in the United States, United Kingdom, and Canada for everyday measurements including height, screen sizes, clothing, and construction.
Common uses of inch measurements include television and monitor screen sizes (measured diagonally), paper sizes, pipe diameters, tire widths, shoe sizing (in the US system), and construction materials like lumber and plywood.
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Browse All 75+ CalculatorsQHow many millimeters are in an inch?
How many millimeters are in an inch?
There are exactly 25.4 millimeters in one inch. This is the internationally agreed definition of the inch and is used in engineering, manufacturing, and scientific applications.
QHow many centimeters are in an inch?
How many centimeters are in an inch?
One inch equals exactly 2.54 centimeters. This conversion is exact, not an approximation, so you can use it for both everyday and precision work.
QHow do I convert inches to feet?
How do I convert inches to feet?
Divide inches by 12 because there are 12 inches in a foot. Example: 36 inches divided by 12 equals 3 feet.
QWhat is a fractional inch?
What is a fractional inch?
A fractional inch expresses measurements as fractions such as 1/2, 1/4, 1/8, 1/16, and 1/32. This format is common in woodworking, construction, and fabrication.
QWhat is 1 inch in pixels?
What is 1 inch in pixels?
It depends on DPI (dots per inch). At 96 DPI (typical web display), 1 inch is 96 pixels. At 300 DPI (print quality), 1 inch is 300 pixels.
QHow do I measure an inch without a ruler?
How do I measure an inch without a ruler?
You can estimate using reference objects: an adult thumb near the first joint is around 1 inch wide, and a standard paperclip is approximately 1.25 inches long.
QHow many inches are in a foot?
How many inches are in a foot?
There are exactly 12 inches in 1 foot. This fixed ratio is part of both imperial and US customary measurement systems.
QHow do I convert decimal inches to fractions?
How do I convert decimal inches to fractions?
Choose a denominator (for example 16 for sixteenths), multiply the decimal by it, and round to the nearest whole number. Example: 0.75 x 16 = 12, so 0.75 inch equals 12/16, which simplifies to 3/4 inch.