7 inches in millimeters

Conversion formula
How to convert 7 inches to millimeters?

We know (by definition) that: $1\mathrm{in}=25.4\mathrm{mm}$

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

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

Conclusion: 7 ⁢ in = 177.79999999999998 ⁢ mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 0.00562429696287964 times 7 inches.

It can also be expressed as: 7 inches is equal to $\frac{1}{\mathrm{0.00562429696287964}}$ millimeters.

Approximation

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