Convert Em to US Survey foot
Unit definitions
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.
US Survey foot
A US survey foot is a unit of length equal to $\frac{1\,200}{3\,937}$ meters.
How to convert Em to US Survey foot
$$\text{Length}_{\text{sFT}} = \text{Length}_{\text{em}} \cdot 0.01388886111111111111111111111111111$$
Examples
Example 1
Convert $30.0\ \text{em}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 30.0 \cdot 0.01388886111111111111111111111111111$$
$$\text{Length}_{\text{sFT}} = 0.416666$$
$$\therefore \ 30.0\ \text{em} = 0.416666 \ \text{sFT}$$
Example 2
Convert $80.0\ \text{em}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 80.0 \cdot 0.01388886111111111111111111111111111$$
$$\text{Length}_{\text{sFT}} = 1.111109$$
$$\therefore \ 80.0\ \text{em} = 1.111109 \ \text{sFT}$$
Example 3
Convert $105.0\ \text{em}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 105.0 \cdot 0.01388886111111111111111111111111111$$
$$\text{Length}_{\text{sFT}} = 1.45833$$
$$\therefore \ 105.0\ \text{em} = 1.45833 \ \text{sFT}$$
Example 4
Convert $150.0\ \text{em}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 150.0 \cdot 0.01388886111111111111111111111111111$$
$$\text{Length}_{\text{sFT}} = 2.083329$$
$$\therefore \ 150.0\ \text{em} = 2.083329 \ \text{sFT}$$
Example 5
Convert $160.0\ \text{em}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 160.0 \cdot 0.01388886111111111111111111111111111$$
$$\text{Length}_{\text{sFT}} = 2.222218$$
$$\therefore \ 160.0\ \text{em} = 2.222218 \ \text{sFT}$$