An imperial ounce is already a unit of measurement. So, there's 1 imperial ounce in 1 imperial ounce.

It's like asking "how many inches are in 1 inch?"

However, if you're asking about conversion between imperial ounces and other units, here are some helpful conversions:

* 1 imperial ounce = 28.3495 grams

* 1 imperial ounce = 0.9331 fluid ounces (US)

Let me know if you have any other measurement conversions you'd like help with!