Carpet & Padding Flooring Yardage Calculator

Carpet is sold in standard roll widths of 12 feet or 15 feet and priced by the square yard. Because carpet must be unrolled in a single direction to maintain pile nap consistency, roll orientation creates necessary cuts and waste.

To use the Carpet & Padding Flooring Yardage Calculator, enter your Room Length, Room Width, Carpet Roll Width Standard and other values. The calculator instantly computes Total Carpet Required, Total Carpet Area and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Room Length (e.g. 18 in ft), Room Width (e.g. 14 in ft), Carpet Roll Width Standard — choose from 12-Foot Wide Roll (Standard), 15-Foot Wide Roll (Large Room / Seamless), Carpet Price per Square Yard (e.g. 25.00 in /sq yd), Underlayment Padding Price (e.g. 0.75 in /sq ft), and Waste & Seam Cut Allowance (e.g. 10 in %). Measure twice before entering dimensions — small measurement errors scale up significantly in material estimates.

The Formula

Square Feet = Length (ft) × Width (ft)

Square Yards = Square Feet ÷ 9

Total Purchased Sq Yd = (Linear Roll Length × Roll Width) ÷ 9

Worked Example

18 ft × 14 ft room (252 sq ft) using 12 ft roll with 10% waste:

Gross Sq Ft = 252 × 1.10 = 277.2 sq ft.

Linear Roll Length = 277.2 / 12 = 24 ft roll.

Purchased Area = 24 × 12 = 288 sq ft (32 sq yd).

Total Cost = + = 800 + 216 = 1,016.

00.

Understanding Your Result

Add a 10% waste factor for square-cut tile or carpet, 15% for diagonal tile installation, and 10–15% for hardwood with natural variations. Flooring is sold in boxes covering fixed square footage — always round up to full boxes. For tile: grout joint width affects coverage; wider joints reduce tile count. For carpet: roll width (typically 12 ft) determines seam placement — minimize seams in high-visibility areas.