Carpet Calculator
Find out how much carpet to order. Enter your room dimensions and a waste allowance to get the area in square feet and square yards — the unit carpet is sold in — plus an estimated cost.
Your project
Estimate
Carpet needed · Includes waste allowance
- Room area
- 180ft²
- Estimated material cost
- $660.00
Estimates are guidance only and exclude tax, labor, and site conditions unless stated. Confirm with a local pro.
How it's calculated
No black boxes — here is the exact math behind your estimate, so you can check it or adapt it for your own quote.
- 1
Room area (ft²) = length × width - 2
Area with waste = room area × (1 + waste% ÷ 100) - 3
Square yards = area with waste ÷ 9 - 4
Cost = square yards × price per yd²
Worked example
A 15 ft × 12 ft bedroom with a 10% waste allowance.
Inputs
- Room length
- 15 ft
- Room width
- 12 ft
- Waste allowance
- 10 %
- Price per yd²
- 30 $/yd²
Result
- Carpet needed
- 22 yd²
- Room area
- 180 ft²
- Estimated material cost
- $660.00
Tools & materials for this project
As an Amazon Associate we may earn from qualifying purchases, at no extra cost to you.
- Carpet padding Adds comfort and extends carpet life underfoot.
- Carpet knee kicker Stretch and seat carpet against the walls.
Compare local pros for carpet
An estimate gets you a budget. A few competing quotes get you the real price. Tell us about the job and we'll help you find vetted contractors nearby.
Carpet cost by state
The calculator does the quantity math exactly. What it can't know is what a fair unit price looks like where you live — carpet runs 61% more in the priciest US market than the cheapest.
Carpet cost in all 50 states + DC US average $4.50 per square foot installed · regional averages, full ranked table, and typical project totals.