CM to Mm
cm to mm Calculator
Easily convert centimeters to millimeters (cm to mm) with this precise length conversion calculator, and explore the formula for accurate centimeter to millimeter conversions
Millimeters and centimeters are common units of length measurement in the metric system, often used in fields like construction, engineering, crafting, and everyday life. Converting between these two units is simple, but understanding the context and practical applications can help ensure accuracy in any task requiring precision.
Understanding the Basics of Conversion
Millimeters to Centimeters (mm to cm) Conversion Formula
To convert millimeters to centimeters, the process is straightforward because there are 10 millimeters in every centimeter. The formula for this conversion is:
cm = mm ÷ 10
Examples Converting mm to cm
Example 1 – Convert 50 mm to cm:
cm = 50 ÷ 10 = 5 cm
So, 50 mm equals 5 cm.
Example 2 – Convert 125 mm to cm:
cm = 125 ÷ 10 = 12.5 cm
Therefore, 125 mm equals 12.5 cm.
Converting Centimeters to Millimeters (cm to mm)
Just as it’s easy to convert millimeters to centimeters, converting centimeters back to millimeters is equally simple. Since 1 cm equals 10 mm, you multiply the number of centimeters by 10 to get the equivalent measurement in millimeters.
Formula for cm to mm Conversion
Conversion for cm to mm formula
mm = cm × 10
Example 1 – Convert 7 cm to mm:
mm = 7 × 10 = 70 mm
So, 7 cm equals 70 mm.
Example 2 – Convert 3.4 cm to mm:
mm = 3.4 × 10 = 34 mm
Thus, 3.4 cm equals 34 mm.
How to Read Measurements Accurately
Identify the number of full centimeters: Look for the numbered marks on the ruler (e.g., 2 cm, 5 cm).
Count the additional millimeter marks: After locating the full centimeters, count the extra millimeter marks to get a precise measurement. For example, if an object measures 3 cm and 7 mm, it would be recorded as 3.7 cm or 37 mm.
How to Measure Using Centimeters and Millimeters
Additional Examples of mm to cm and cm to mm Conversions
Here are a few more examples of converting between millimeters and centimeters to provide clarity:
Example 1 – Convert 85 mm to cm:
cm = 85 ÷ 10 = 8.5 cm
Example 2 – Convert 4.2 cm to mm:
mm = 4.2 × 10 = 42 mm
Example 3: Convert 200 mm to cm:
cm = 200 ÷ 10 = 20 cm
Example 4 – Convert 9.3 cm to mm:
mm = 9.3 × 10 = 93 mm
Understanding how to measure in both cm and mm can help with precision in many tasks. Here’s a step by step approach for reading measurements using a ruler or measuring tape:
Using a Ruler or Measuring Tape
Millimeters (mm): Typically, each small mark on a standard metric ruler represents 1 mm. Ten of these small marks make up one centimeter.
Centimeters (cm): The larger, numbered marks on the ruler represent 1 cm, which is equivalent to 10 mm.
Practical Applications – When to Convert mm to cm
Ring Size Conversion (cm to mm)
When measuring for something like a ring size, converting between cm and mm can be especially useful. For example, if the circumference of a ring is measured at 5 cm, this is equivalent to 50 mm, making it easier to compare with standardized ring sizes.
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.5 cm to mm | 5 mm |
| 1 cm to mm | 10 mm |
| 1.2 cm to mm | 12 mm |
| 1.5 cm to mm | 15 mm |
| 2 cm to mm | 20 mm |
| 2.5 cm to mm | 25 mm |
| 3 cm to mm | 30 mm |
| 3.5 cm to mm | 35 mm |
| 4.5 cm to mm | 45 mm |
| 5 cm to mm | 50 mm |
| 5.5 cm to mm | 55 mm |
| 6 cm to mm | 60 mm |
| 6.3 cm to mm | 63 mm |
| 6.5 cm to mm | 65 mm |
| 7 cm to mm | 70 mm |
| 7.5 cm to mm | 75 mm |
| 16 cm to mm | 160 mm |
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 1 mm to cm | 0.1 cm |
| 5 mm to cm | 0.5 cm |
| 6 mm to cm | 0.6 cm |
| 8 mm to cm | 0.8 cm |
| 10 mm to cm | 1 cm |
| 11 mm to cm | 1.1 cm |
| 15 mm to cm | 1.5 cm |
| 18 mm to cm | 1.8 cm |
| 20 mm to cm | 2 cm |
| 30 mm to cm | 3 cm |
| 40 mm to cm | 4 cm |
| 70 mm to cm | 7 cm |
| 100 mm to cm | 10 cm |
| 120 mm to cm | 12 cm |
| 150 mm to cm | 15 cm |
| 200 mm to cm | 20 cm |