cm to mm Converter

How many millimeters in a centimeter

There are 10 millimeters in a centimeter.

Since 1 centimeter (cm) is defined as 10 millimeters (mm), the conversion is straightforward:

1 cm = 10 mm.

How many centimeters in a millimeter

There are 0.1 centimeters in a millimeter.

Since 1 centimeter (cm) equals to 10 millimeters (mm), the conversion is:

1 mm = 0.1 cm.

Common Everyday Items Measured in Centimeters (cm) and Millimeters (mm)

Here are some everyday examples to help you understand how centimeters (cm) and millimeters (mm) are commonly used for measurement.

Items Measured in Centimeters (cm)

Centimeters are used for larger objects, commonly for measuring length and height.

• Human height (e.g., 170 cm = 1.7 m)

• Books (e.g., A4 paper: height 29.7 cm, width 21 cm)

• Smartphone screens (e.g., 6.5 inches ≈ 16.5 cm)

• Laptop screens (e.g., 15.6 inches ≈ 39.6 cm)

• Table height (usually 70-80 cm)

• Shoe length (typically 20-30 cm)

• TV screen size (e.g., 55 inches ≈ 139.7 cm)

Items Measured in Millimeters (mm)

Millimeters are used for smaller objects that require precise measurements.

• Ring size (inner diameter usually 14-22 mm)

• Credit card thickness (about 0.76 mm)

• Paper thickness (typically 0.05-0.1 mm)

• Nail thickness (typically 0.5-1 mm)

• Smartphone glass thickness (usually 0.3-1 mm)

• Watch case thickness (usually 8-12 mm)

• Button diameter (usually 10-15 mm)

• Coin thickness (e.g., a 1-yuan coin ≈ 2 mm)

• Headphone jack diameter (e.g., 3.5 mm audio port)

Summary

• cm is used for larger objects (tables, human height, books, TV screens).

• mm is used for smaller objects (paper thickness, coins, headphone jacks).