Our tool accounts for an additional 2 inches (approximately 5 cm) on each side of the carpet for the width, ensuring proper edge coverage, as well as an extra 2 inches per step for enhanced edge wrapping. As recommended by leading merchants, we have set a default wastage allowance of 10%. You can easily adjust this to your desired level for optimal results. Standard carpet rolls come in widths of 3.66m, or 4m or even 5m, depending on the retailer.