How many inches are 21 centimeters?

21 centimeters = 8.2677165354 inches

How to convert from centimeters to inches

To convert from centimeters to inches, we follow these steps:

1. Take the number of centimeters we want to convert. In this case, we want to convert 21 centimeters.
2. Divide this number by the conversion factor: 2.54.
3. The result of this division gives us the equivalent in inches.

Inches = Centimeters ÷ 2.54

This conversion factor is because one inch is exactly equal to 2.54 centimeters.

For example, to convert 21 centimeters to inches:

21 centimeters ÷ 2.54 = 8.2677165354 inches

In practice, we often round to two decimal places, so we would say that 21 centimeters is approximately 8.27 inches.

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Information about the units

Centimeter

The centimeter is a unit of length in the International System of Units. It equals 0.01 meters or 10 millimeters. It's a very practical unit for everyday measurements and is widely used around the world in fields such as fashion, design, meteorology (for measuring precipitation), and in education to teach the metric system.

Inch

The inch is a unit of length primarily used in Anglo-Saxon measurement systems. One inch is exactly equal to 2.54 centimeters. Originally based on the width of the human thumb, the inch is commonly used in the United States and the United Kingdom for measuring dimensions in carpentry, electronics (such as TV screens), and in many manufactured products.

Common uses for this conversion

• Measuring screens of electronic devices (TV, monitors, smartphones)
• Converting measurements in carpentry and construction
• Adapting international cooking recipes
• Buying clothes and shoes from international stores
• Measuring precipitation in meteorology
• Calculations in graphic design and printing

Fun fact

The 30-centimeter ruler, or "foot ruler", was standardized by King Henry I of England in the 12th century based on the length of his own foot.