You can't directly convert feet to cubic inches because they measure different things:

* Feet measure length or distance.

* Cubic inches measure volume (three-dimensional space).

To convert to cubic inches, you'd need a three-dimensional measurement, like a cube or a box.

For example:

If you have a cube that is 0.133681 feet long, wide, and tall, you can calculate its volume in cubic inches like this:

1. Convert feet to inches: 0.133681 feet * 12 inches/foot = 1.604172 inches

2. Calculate volume: 1.604172 inches * 1.604172 inches * 1.604172 inches = 4.13455 cubic inches

Let me know if you have a different scenario, and I can help you with the conversion.