Roofing Calculator
https://www.scribd.com/document/459027267/162476Don-039-039-t-Fail-on-Shingles-How-to-Quote-Materials-for-Roof-Projects
Take the square foot of 5,128 divide by 100 (100 sq ft amounts to one square), so you have 51.28. It takes 3 packages per square, so you will multiply 51.28 by 3 as well as you will get 153.84. Roofing contractors