Unit Converter
Conversion formula
The conversion factor from millimeters to centimeters is 0.1, which means that 1 millimeter is equal to 0.1 centimeters:
1 mm = 0.1 cm
To convert 21 millimeters into centimeters we have to multiply 21 by the conversion factor in order to get the length amount from millimeters to centimeters. We can also form a simple proportion to calculate the result:
1 mm → 0.1 cm
21 mm → L(cm)
Solve the above proportion to obtain the length L in centimeters:
L(cm) = 21 mm × 0.1 cm
L(cm) = 2.1 cm
The final result is:
21 mm → 2.1 cm
We conclude that 21 millimeters is equivalent to 2.1 centimeters:
21 millimeters = 2.1 centimeters
Alternative conversion
We can also convert by utilizing the inverse value of the conversion factor. In this case 1 centimeter is equal to 0.47619047619048 × 21 millimeters.
Another way is saying that 21 millimeters is equal to 1 ÷ 0.47619047619048 centimeters.
Approximate result
For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one millimeters is approximately two point one centimeters:
21 mm ≅ 2.1 cm
An alternative is also that one centimeter is approximately zero point four seven six times twenty-one millimeters.
Conversion table
millimeters to centimeters chart
For quick reference purposes, below is the conversion table you can use to convert from millimeters to centimeters
millimeters (mm) | centimeters (cm) |
---|---|
22 millimeters | 2.2 centimeters |
23 millimeters | 2.3 centimeters |
24 millimeters | 2.4 centimeters |
25 millimeters | 2.5 centimeters |
26 millimeters | 2.6 centimeters |
27 millimeters | 2.7 centimeters |
28 millimeters | 2.8 centimeters |
29 millimeters | 2.9 centimeters |
30 millimeters | 3 centimeters |
31 millimeters | 3.1 centimeters |