Roll width, explained

The core idea

Carpet and sheet vinyl are manufactured and sold in a fixed roll width, most often 4m or 5m for carpet and 2m to 4m for vinyl. When a length is cut from the roll, you pay for the full width of that cut, whether or not the room actually uses all of it. A floor-area calculation (just length times width times a price per square metre) ignores this completely, and can under-quote a real job by anywhere from 17 to 94 percent depending on the roll width involved.

A worked example

Take a room 4.4m by 3.2m: 14.08 square metres of actual floor. On a 4m roll, once trim and waste allowances are added, that room needs 20.0 square metres ordered, because the 3.2m width does not divide evenly into the 4m roll without extra. On a 5m roll the same room needs 18.5 square metres. Both numbers are higher than the 14.08 square metre floor area, and the gap between them shows why roll width is worth checking before you compare two prices.

Seams and rotation

When a room is wider than the roll in both directions, a seam becomes unavoidable, and our estimator flags this rather than hiding it inside a single total. Sometimes the carpet can be turned 90 degrees to fit inside the roll width without a seam; our engine tries both directions and picks whichever needs less material, though turning the pile can change how it catches the light, so it is always confirmed with you rather than decided automatically.

Why we show it this way

A single headline price without the ordered area hides exactly the information a fair comparison needs. Showing both numbers, on every range page and in every estimate, means the price in front of you is one you can actually check.