840 millimeters in inches

Conversion formula
How to convert 840 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: 840 ⁢ mm ≈ 33.070866360000004 ⁢ in

Conversion in the opposite direction

The inverse of the conversion factor is that 1 inch is equal to 0.0302380952380952 times 840 millimeters.

It can also be expressed as: 840 millimeters is equal to $\frac{1}{\mathrm{0.0302380952380952}}$ inches.

Approximation

An approximate numerical result would be: eight hundred and forty millimeters is about thirty-three point zero seven inches, or alternatively, a inch is about zero point zero three times eight hundred and forty millimeters.