12 inches in millimeters

Result

The conversion result is: 12 inches is equivalent to 304.8 millimeters.^[1]

Conversion formula
How to convert 12 inches to millimeters?

We know (by definition) that: 1 in = 25.4 mm.

We can set up a proportion to solve for the number of millimeters.

1 in / 12 in = 25.4 mm / x mm

Now, we cross multiply to solve for our unknown x:

x mm = (12 in / 1 in) * 25.4 mm → x mm = 304.79999999999995 mm

Conclusion:

12 in = 304.79999999999995 mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.00328083989501312 times 12 inches.

It can also be expressed as: 12 inches is equal to 1 / 0.00328083989501312 millimeters.

Approximation

An approximate numerical result would be: twelve inches is about zero millimeters, or alternatively, a millimeter is about zero times twelve inches.