Convert Cubic foot to US beer barrel
Unit definitions
Cubic foot
The cubic foot is the volume of a cube with edges exactly $1$ foot in length.
US beer barrel
The US beer barrel is defined as exactly $31$ US liquid gallons.
How to convert Cubic foot to US beer barrel
$$\text{Volume}_{\text{bbl (beer)}} = \text{Volume}_{\text{ft³}} \cdot 0.2413070800167574361122748219522413$$
Examples
Example 1
Convert $25.0\ \text{ft³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 25.0 \cdot 0.2413070800167574361122748219522413$$
$$\text{Volume}_{\text{bbl (beer)}} = 6.032677$$
$$\therefore \ 25.0\ \text{ft³} = 6.032677 \ \text{bbl (beer)}$$
Example 2
Convert $75.0\ \text{ft³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 75.0 \cdot 0.2413070800167574361122748219522413$$
$$\text{Volume}_{\text{bbl (beer)}} = 18.098031$$
$$\therefore \ 75.0\ \text{ft³} = 18.098031 \ \text{bbl (beer)}$$
Example 3
Convert $115.0\ \text{ft³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 115.0 \cdot 0.2413070800167574361122748219522413$$
$$\text{Volume}_{\text{bbl (beer)}} = 27.750314$$
$$\therefore \ 115.0\ \text{ft³} = 27.750314 \ \text{bbl (beer)}$$
Example 4
Convert $135.0\ \text{ft³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 135.0 \cdot 0.2413070800167574361122748219522413$$
$$\text{Volume}_{\text{bbl (beer)}} = 32.576456$$
$$\therefore \ 135.0\ \text{ft³} = 32.576456 \ \text{bbl (beer)}$$
Example 5
Convert $200.0\ \text{ft³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 200.0 \cdot 0.2413070800167574361122748219522413$$
$$\text{Volume}_{\text{bbl (beer)}} = 48.261416$$
$$\therefore \ 200.0\ \text{ft³} = 48.261416 \ \text{bbl (beer)}$$