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 821 millimeters into centimeters we have to multiply 821 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

821 mm → L_(cm)

Solve the above proportion to obtain the length L in centimeters:

L_(cm) = 821 mm × 0.1 cm

L_(cm) = 82.1 cm

The final result is:

821 mm → 82.1 cm

We conclude that 821 millimeters is equivalent to 82.1 centimeters:

821 millimeters = 82.1 centimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 centimeter is equal to 0.012180267965895 × 821 millimeters.

Another way is saying that 821 millimeters is equal to 1 ÷ 0.012180267965895 centimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eight hundred twenty-one millimeters is approximately eighty-two point one centimeters:

821 mm ≅ 82.1 cm

An alternative is also that one centimeter is approximately zero point zero one two times eight hundred 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