Webwhen planning a home renovation, knowing how much drywall you’ll need is crucial for budgeting. By entering the dimensions of your rooms into the lowe’s drywall calculator,. Webwe recommend the following tools to complete your project: Utility knife and extra blades. Caulk gun and panel adhesive. Webthe smallest and most common size for drywall panels is 4 feet by 8 feet. If you want to have fewer seams on a wall or ceiling,.