How to convert from centimeters to inches
Divide by 2.54. An inch has been defined as exactly 2.54 cm since 1959, so this one never drifts – 30 cm comes to 11.81 inches, which is why a 30 cm ruler falls just short of a foot.
For a rough answer in your head, multiply by 4 and divide by 10: 30 cm gives 12 inches, about 1.6% high. Fine for a shelf, less so for a sewing pattern where the error adds up seam by seam.
Centimeters
Centimeters are a unit of length in the metric system, commonly used to measure small distances. One centimeter is equal to one hundredth of a meter, making it a convenient unit for measuring objects that are relatively small in size. The abbreviation for centimeters is "cm."
Centimeters are widely used in various fields, including science, engineering, and everyday life. They are particularly useful for measuring the length, width, and height of objects, as well as distances between points. For example, centimeters are commonly used to measure the size of clothing, the length of a pencil, or the width of a book.
One of the advantages of using centimeters is their ease of conversion within the metric system. For instance, 100 centimeters make up one meter, and 1,000 meters make up one kilometer. This makes it simple to convert between different metric units of length, allowing for easy calculations and comparisons.
What are inches?
Inches are mainly used in the United States as well as sometimes in the United Kingdom.
An inch is an imperial unit which is primarily used in the United States. It is defined as a twelth (1/12th) of a foot. Inches are used to measure smaller distances such as the length of a pencil or the width of a book. Rather than using decimals, Inches are often divided into fractions such as halves, quarters, and eighths.
Converting inches to centimeters involves multiplying by the conversion factor 2.54. For example, 100 inches would be 254 centimeters. The reverse is also true, to convert centimeters to inches you divide the number of centimeters by 2.54. For example, 50 centimeters would be approximately 19.69 inches.
Which countries use centimeters?
A majority of countries worldwide have adopted the metric system and as such use centimeters.
In these countries millimeters are the preferred unit for measuring dimensions of building materials, such as pipes, beams, and panels. Centimeters are found in manufacturing, machinery and tools. Centimeters are also used in medicine and are used in the fashion and textile industry.
Which countries use inches?
The United States is the most notable country that uses inches but a large number of people still use them in the United Kingdom as well. In the US, inches are the standard in construction and engineering. Inches are also common in determining a person's height or the size of television screens.
Although the UK has officially adopted the metric system, inches are still found in certain area particularly in construction. This is due to the historical influence of the imperial system. In the UK inches are also used for body height and objects that were traditionally measured this way such as vinyl records.