How much material do I need if one box is 18.62sq ft per box. My total sq ft is176.70 sq ft.

Do the math, divide one by the other and round up.... and allow for maybe 20% extra due to waste from cutting etc including mistakes cutting, rounded up to the next full box... and keeping a few spare pieces for future repairs. A smart person never buys only exactly what they need. You could always take extra boxes back to the store. Just make sure they are all from the same lot.

Whoa, basic math. 180/19 + 10-15% = C'mon you can do that!

In one second you can see that 10 boxes is 186 sq' so buy 11 for waste and cutting.

Go with 11 if that's your total square.