Unit Converter
Conversion formula
The conversion factor from centimeters to millimeters is 10, which means that 1 centimeter is equal to 10 millimeters:
1 cm = 10 mm
To convert 40 centimeters into millimeters we have to multiply 40 by the conversion factor in order to get the length amount from centimeters to millimeters. We can also form a simple proportion to calculate the result:
1 cm → 10 mm
40 cm → L(mm)
Solve the above proportion to obtain the length L in millimeters:
L(mm) = 40 cm × 10 mm
L(mm) = 400 mm
The final result is:
40 cm → 400 mm
We conclude that 40 centimeters is equivalent to 400 millimeters:
40 centimeters = 400 millimeters
Alternative conversion
We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.0025 × 40 centimeters.
Another way is saying that 40 centimeters is equal to 1 ÷ 0.0025 millimeters.
Approximate result
For practical purposes we can round our final result to an approximate numerical value. We can say that forty centimeters is approximately four hundred millimeters:
40 cm ≅ 400 mm
An alternative is also that one millimeter is approximately zero point zero zero three times forty centimeters.
Conversion table
centimeters to millimeters chart
For quick reference purposes, below is the conversion table you can use to convert from centimeters to millimeters
centimeters (cm) | millimeters (mm) |
---|---|
41 centimeters | 410 millimeters |
42 centimeters | 420 millimeters |
43 centimeters | 430 millimeters |
44 centimeters | 440 millimeters |
45 centimeters | 450 millimeters |
46 centimeters | 460 millimeters |
47 centimeters | 470 millimeters |
48 centimeters | 480 millimeters |
49 centimeters | 490 millimeters |
50 centimeters | 500 millimeters |