Convert Millimeter to Em
Unit definitions
Millimeter
$\frac{1}{10^{3}}$ of a meter is a millimeter.
Em
An em is a unit of typography equal to the point size of the font, commonly $12$ points or $\frac{1}{6}$ of an inch.
How to convert Millimeter to Em
$$\text{Length}_{\text{em}} = \text{Length}_{\text{mm}} \cdot 0.2362204724409448818897637795275591$$
Examples
Example 1
Convert $40.0\ \text{mm}$ to $\text{em}$.
$$\text{Length}_{\text{em}} = 40.0 \cdot 0.2362204724409448818897637795275591$$
$$\text{Length}_{\text{em}} = 9.448819$$
$$\therefore \ 40.0\ \text{mm} = 9.448819 \ \text{em}$$
Example 2
Convert $90.0\ \text{mm}$ to $\text{em}$.
$$\text{Length}_{\text{em}} = 90.0 \cdot 0.2362204724409448818897637795275591$$
$$\text{Length}_{\text{em}} = 21.259843$$
$$\therefore \ 90.0\ \text{mm} = 21.259843 \ \text{em}$$
Example 3
Convert $105.0\ \text{mm}$ to $\text{em}$.
$$\text{Length}_{\text{em}} = 105.0 \cdot 0.2362204724409448818897637795275591$$
$$\text{Length}_{\text{em}} = 24.80315$$
$$\therefore \ 105.0\ \text{mm} = 24.80315 \ \text{em}$$
Example 4
Convert $145.0\ \text{mm}$ to $\text{em}$.
$$\text{Length}_{\text{em}} = 145.0 \cdot 0.2362204724409448818897637795275591$$
$$\text{Length}_{\text{em}} = 34.251969$$
$$\therefore \ 145.0\ \text{mm} = 34.251969 \ \text{em}$$
Example 5
Convert $195.0\ \text{mm}$ to $\text{em}$.
$$\text{Length}_{\text{em}} = 195.0 \cdot 0.2362204724409448818897637795275591$$
$$\text{Length}_{\text{em}} = 46.062992$$
$$\therefore \ 195.0\ \text{mm} = 46.062992 \ \text{em}$$