Convert Foot to US Survey foot
Unit definitions
Foot
A foot is a unit of length equal to $0.304\,8$ meters. One foot is equal to $12$ inches.
US Survey foot
A US survey foot is a unit of length equal to $\frac{1\,200}{3\,937}$ meters.
How to convert Foot to US Survey foot
$$\text{Length}_{\text{sFT}} = \text{Length}_{\text{ft}} \cdot 0.999998$$
Examples
Example 1
Convert $25.0\ \text{ft}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 25.0 \cdot 0.999998$$
$$\text{Length}_{\text{sFT}} = 24.99995$$
$$\therefore \ 25.0\ \text{ft} = 24.99995 \ \text{sFT}$$
Example 2
Convert $65.0\ \text{ft}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 65.0 \cdot 0.999998$$
$$\text{Length}_{\text{sFT}} = 64.99987$$
$$\therefore \ 65.0\ \text{ft} = 64.99987 \ \text{sFT}$$
Example 3
Convert $105.0\ \text{ft}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 105.0 \cdot 0.999998$$
$$\text{Length}_{\text{sFT}} = 104.99979$$
$$\therefore \ 105.0\ \text{ft} = 104.99979 \ \text{sFT}$$
Example 4
Convert $135.0\ \text{ft}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 135.0 \cdot 0.999998$$
$$\text{Length}_{\text{sFT}} = 134.99973$$
$$\therefore \ 135.0\ \text{ft} = 134.99973 \ \text{sFT}$$
Example 5
Convert $180.0\ \text{ft}$ to $\text{sFT}$.
$$\text{Length}_{\text{sFT}} = 180.0 \cdot 0.999998$$
$$\text{Length}_{\text{sFT}} = 179.99964$$
$$\therefore \ 180.0\ \text{ft} = 179.99964 \ \text{sFT}$$