how to convert mm to cm

How to Convert Millimeters to Centimeters

Millimeters (mm) and centimeters (cm) are both units of length used in the metric system. Understanding how to convert between these two units is essential in various fields like engineering, construction, and manufacturing. This article will provide a simple and easy-to-follow guide on converting millimeters to centimeters.

What are Millimeters and Centimeters?

Millimeters are a small unit of measurement in the metric system. They are commonly used to specify the dimensions of small objects, such as nails, screws, and electronic components. One millimeter is equal to one-thousandth of a meter.

how to convert mm to cm

Centimeters, on the other hand, are a slightly larger unit of measurement in the metric system. They are often used to measure the length of everyday objects, such as pencils, books, and furniture. One centimeter is equal to one-hundredth of a meter.

The Conversion Formula

To convert millimeters to centimeters, you can use the following simple formula:

Centimeters = Millimeters ÷ 10

This formula works because there are 10 millimeters in a centimeter. Therefore, by dividing the length in millimeters by 10, you will obtain the equivalent length in centimeters.

Examples of Conversion

Let’s convert some millimeter measurements to centimeters using the formula:

Example 1:

Convert 500 millimeters to centimeters:

Centimeters = 500 ÷ 10 = 50

Therefore, 500 millimeters is equal to 50 centimeters.

Example 2:

Convert 750 millimeters to centimeters:

Centimeters = 750 ÷ 10 = 75

Hence, 750 millimeters is equal to 75 centimeters.

Example 3:

Convert 1200 millimeters to centimeters:

Centimeters = 1200 ÷ 10 = 120

Thus, 1200 millimeters is equal to 120 centimeters.

Converting Large Numbers

Converting large numbers of millimeters to centimeters follows the same formula. Divide the length in millimeters by 10 to obtain the equivalent length in centimeters.

Example 4:

Convert 10,000 millimeters to centimeters:

Centimeters = 10,000 ÷ 10 = 1000

Therefore, 10,000 millimeters is equal to 1000 centimeters.

When to Use Millimeters vs. Centimeters

The choice between using millimeters or centimeters depends on the specific context and the required level of precision. Millimeters are usually preferred for measurements that require higher accuracy or involve smaller objects, while centimeters are commonly used for everyday measurements and objects of medium size.

For example, in architecture and engineering, millimeters are often used to ensure precise measurements in construction plans. On the other hand, for measuring the length of a table or a piece of clothing, centimeters are more suitable.

Rounding the Conversion

When converting millimeters to centimeters, it is common practice to round the resulting value to a desired decimal place. For instance, if the calculation yields a decimal such as 3.55 centimeters, you can round it to 3.6 centimeters or 3.6 cm for easier readability.

However, in some cases, the precise value may be required, especially in scientific or technical fields. Always consider the specific requirements of your project or application when deciding whether to round the converted value or retain greater precision.


Converting millimeters to centimeters is a simple process that involves dividing the length in millimeters by 10. Whether you’re working in construction, engineering, or any field that requires metric measurements, understanding this conversion is essential. By using the conversion formula and rounding techniques, you can easily switch between millimeters and centimeters with accuracy and confidence.

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