198"w x 20.5"l. Peel-and-stick vinyl. Easy to install and remove. Recommended for smooth surfaces that are in good condition. Covers 28 sq. ft. To calculate the number of rolls you need: 1) Measure the height and the width of your space in inches; 2) Multiply the two numbers; 3) Divide the sum by 144; 4) Divide by coverage per roll (i.e., number of square feet covered per roll); 5) Multiply by 1.15 (to ensure sufficient supply for pattern alignment and potential mistakes); 6) Round up to the full roll.