Conversion formula

The conversion factor from inches to millimeters is 25.4, which means that 1 inch is equal to 25.4 millimeters:

1 in = 25.4 mm

To convert 27 inches into millimeters we have to multiply 27 by the conversion factor in order to get the length amount from inches to millimeters. We can also form a simple proportion to calculate the result:

1 in → 25.4 mm

27 in → L_(mm)

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

L_(mm) = 27 in × 25.4 mm

L_(mm) = 685.8 mm

The final result is:

27 in → 685.8 mm

We conclude that 27 inches is equivalent to 685.8 millimeters:

27 inches = 685.8 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.0014581510644503 × 27 inches.

Another way is saying that 27 inches is equal to 1 ÷ 0.0014581510644503 millimeters.

Approximate result

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

27 in ≅ 685.8 mm

An alternative is also that one millimeter is approximately zero point zero zero one times twenty-seven inches.

Conversion table

inches to millimeters chart

For quick reference purposes, below is the conversion table you can use to convert from inches to millimeters