There's a slight misunderstanding in the question. You can't directly convert "12 a pound" into kilograms.

Here's why:

* "12 a pound" is not a weight unit. It's likely a phrase referring to a quantity or number of something *per pound*. For example, "12 apples per pound" or "12 nails per pound."

* Kilograms measure weight. To convert something to kilograms, you need a weight value to start with.

To help you further, please tell me what "12 a pound" refers to, and I can help you convert it to kilograms.