Carpet Calculator
Figure the square yards of carpet to buy off a 12- or 15-foot roll, the seams, and the total with pad and installation.
Carpet to buy
21 yd² (189 ft²)
- Room size
- 20 yd² (180 ft²)
- Layout
- 1 strip 12 ft wide × 15 ft · no seams
Pad and installation are priced on the room's area; carpet on what comes off the roll. Stairs, closets and pattern matching add more.
Show the work
Each layout, strips rounded up
ft² = ⌈side ÷ roll width⌉ × roll width × other side
⌈12 ÷ 12⌉ × 12 × 15; ⌈15 ÷ 12⌉ × 12 × 12 = 180 ft²; 288 ft²
Smaller one, plus trimming
ft² × (1 + extra ÷ 100)
180 × (1 + 5 ÷ 100) = 189 ft²
Square yards: 9 ft² in each
yd² = ft² ÷ 9
189 ÷ 9 = 21 yd² (189 ft²)
How it works
Carpet comes off a roll, so you buy roll width × length for each strip: strips = ⌈room width ÷ roll width⌉ (the cheaper direction is used); square yards = square feet ÷ 9
Questions
- How does the carpet calculator work?
- Carpet comes off a roll, so you buy roll width × length for each strip: strips = ⌈room width ÷ roll width⌉ (the cheaper direction is used); square yards = square feet ÷ 9.
- What do I need to enter?
- Room length, Room width, Roll width, Extra for trimming, Carpet price, Pad price, Installation. Optional fields can be left blank.
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