Part of the DIY & Home collection — 4 tools available
Carpet Calculator
Calculate how much carpet you need in square yards. Enter room dimensions to estimate carpet area, waste, and total cost for your flooring project.
About This Calculator
Estimating carpet for a room involves more than measuring square footage — carpet comes in fixed-width rolls (typically 12 or 15 feet), and the way you lay the roll relative to room dimensions determines how much waste you generate from seams and cuts. A 14*18 foot room using 12-foot carpet needs a seam, creating significant waste that a simple area calculation misses. Pattern matching, closet extensions, and stairs add further complexity. Our carpet calculator accounts for roll width, seam placement, and a configurable waste factor to give you a realistic material estimate.
The Formula Behind This Calculator
Area = Length * Width Carpet needed = Area + 10% waste Cost = Area * Price/sq ft + Installation
Understanding the math helps you verify results and make better decisions for your project.
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How to Use
- 1Measure room length and width in feet (measure at the widest points).
- 2Set waste factor (10% standard, 15% for patterned carpet).
- 3Enter the installed price per square yard from your quote.
- 4Click Calculate for total square yards and cost.
When to Use
- →Estimating carpet quantities before getting quotes from flooring installers
- →Comparing carpet costs between different rooms or quality levels for a whole-house renovation
- →Budgeting a DIY carpet installation project with accurate square yard measurements
Tips
- ✓Carpet comes in 12 or 15-foot wide rolls — rooms wider than the roll will need seams, so plan the layout carefully
- ✓Don't skimp on padding — good padding extends carpet life by years and improves comfort underfoot
- ✓Add 10% waste for plain carpet and 15-20% for patterned carpet that needs to match at seams
FAQ
How is carpet measured and sold?
Carpet typically comes in 12-foot or 15-foot wide rolls, sold by the square yard (9 sq ft). Rooms wider than the roll width require seams, which add to waste.
How much waste should I add for carpet?
10% for plain carpet in rectangular rooms, 15-20% for patterned carpet that must match at seams, stairs, or irregular room shapes.
Does carpet installation include padding?
Usually quoted separately. Rebond padding costs $0.50-$1.50/sq ft. Better padding extends carpet life and improves comfort — don't skip it.
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