Convert US fluid ounce to UK fluid ounce
Unit definitions
US fluid ounce
$\frac{1}{128}$ of a US liquid gallon is a US fluid ounce.
UK fluid ounce
$\frac{1}{160}$ of a UK gallon is a UK fluid ounce.
How to convert US fluid ounce to UK fluid ounce
$$\text{Volume}_{\text{oz (uk)}} = \text{Volume}_{\text{oz (us)}} \cdot 1.040842730786236084195429478958842$$
Examples
Example 1
Convert $45.0\ \text{oz (us)}$ to $\text{oz (uk)}$.
$$\text{Volume}_{\text{oz (uk)}} = 45.0 \cdot 1.040842730786236084195429478958842$$
$$\text{Volume}_{\text{oz (uk)}} = 46.837923$$
$$\therefore \ 45.0\ \text{oz (us)} = 46.837923 \ \text{oz (uk)}$$
Example 2
Convert $65.0\ \text{oz (us)}$ to $\text{oz (uk)}$.
$$\text{Volume}_{\text{oz (uk)}} = 65.0 \cdot 1.040842730786236084195429478958842$$
$$\text{Volume}_{\text{oz (uk)}} = 67.654778$$
$$\therefore \ 65.0\ \text{oz (us)} = 67.654778 \ \text{oz (uk)}$$
Example 3
Convert $105.0\ \text{oz (us)}$ to $\text{oz (uk)}$.
$$\text{Volume}_{\text{oz (uk)}} = 105.0 \cdot 1.040842730786236084195429478958842$$
$$\text{Volume}_{\text{oz (uk)}} = 109.288487$$
$$\therefore \ 105.0\ \text{oz (us)} = 109.288487 \ \text{oz (uk)}$$
Example 4
Convert $145.0\ \text{oz (us)}$ to $\text{oz (uk)}$.
$$\text{Volume}_{\text{oz (uk)}} = 145.0 \cdot 1.040842730786236084195429478958842$$
$$\text{Volume}_{\text{oz (uk)}} = 150.922196$$
$$\therefore \ 145.0\ \text{oz (us)} = 150.922196 \ \text{oz (uk)}$$
Example 5
Convert $200.0\ \text{oz (us)}$ to $\text{oz (uk)}$.
$$\text{Volume}_{\text{oz (uk)}} = 200.0 \cdot 1.040842730786236084195429478958842$$
$$\text{Volume}_{\text{oz (uk)}} = 208.168546$$
$$\therefore \ 200.0\ \text{oz (us)} = 208.168546 \ \text{oz (uk)}$$