Carpet Calculator — Square Footage & Rolls
Estimate how much carpet and padding you need for any room. This calculator accounts for roll width, seam direction, waste factor, and gives you cost estimates based on your price per square foot.
Room Details
Full Breakdown
Room Area
Waste Allowance
Total Carpet Needed
Linear Feet of Roll
Square Yards
Padding Needed
Carpet Cost
Padding Cost
Total Material Cost
How to Use This Calculator
- Enter the room length and width in feet.
- Select the carpet roll width (12 ft is most common).
- Set the waste factor — 10% is standard; use 15% for patterned carpet.
- Optionally enter carpet and padding cost per square foot.
- Click "Calculate Carpet" to see your results.
The Formula
Room Area = Length × Width
Total with Waste = Room Area × (1 + Waste%/100)
Linear Feet of Roll = Total Sq Ft ÷ Roll Width
Square Yards = Total Sq Ft ÷ 9
Padding = Same sq ft as carpet
Total with Waste = Room Area × (1 + Waste%/100)
Linear Feet of Roll = Total Sq Ft ÷ Roll Width
Square Yards = Total Sq Ft ÷ 9
Padding = Same sq ft as carpet
Carpet is sold by the square yard or square foot, cut from rolls typically 12 ft wide. The calculator rounds up linear feet to avoid short pieces. Always order a bit extra for seams and pattern matching.