Why Use This Calculator?
Carpet is sold by the square yard, rooms are measured in feet, and every installation needs extra material for seams, closets, and pattern matching. This calculator bridges all three: square feet from your room, square yards for the store, and a cost estimate with waste built in.
The 10% default waste allowance covers normal cuts and layout quirks; complicated rooms with angles and alcoves deserve 15–20%. Measure the longest and widest points, including closets that will be carpeted.
How It Works
- Measure the room's longest length and widest width in feet.
- Keep the 10% waste allowance — raise it for angled rooms or patterned carpet.
- Add the price per square yard for an installed-materials estimate.
Frequently Asked Questions
How does a carpet area calculator handle square yards?
One square yard equals nine square feet. Retailers quote carpet by the yard, so the tool divides your square footage — waste included — by nine and prices from there.
How much waste should I allow?
Straight rectangular rooms are fine at 5–10%. Stairs, pattern repeats that must align, and L-shaped layouts push 15–20% — better to have a leftover roll section than a visible seam patch.
Does carpet come in standard widths?
Most broadloom carpet is 12 or 15 feet wide. Rooms wider than the roll need a seam, which is part of why the waste allowance exists.
Tips & Things to Watch
- Measure to the walls, not the baseboards' outer edge — carpet tucks at the tack strip.
- Get the yardage from two rooms at once if the same carpet runs through a doorway.
- Padding is priced separately — budget roughly a third of the carpet cost.