30 millimeters in inches

Conversion formula
How to convert 30 millimeters to inches?

We know (by definition) that: $1\mathrm{mm}\approx 0.039370079\mathrm{in}$

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

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

Conclusion: 30 ⁢ mm ≈ 1.18110237 ⁢ in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 0.846666666666667 times 30 millimeters.

It can also be expressed as: 30 millimeters is equal to $\frac{1}{\mathrm{0.846666666666667}}$ inches.

Approximation

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