420 millimeters in inches

Conversion formula
How to convert 420 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: 420 ⁢ mm ≈ 16.535433180000002 ⁢ in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 0.0604761904761905 times 420 millimeters.

It can also be expressed as: 420 millimeters is equal to $\frac{1}{\mathrm{0.0604761904761905}}$ inches.

Approximation

An approximate numerical result would be: four hundred and twenty millimeters is about sixteen point five three inches, or alternatively, a inch is about zero point zero six times four hundred and twenty millimeters.