Carpet calculator
How much carpet to buy for a room. Enter the room and the roll width from the label or the store; we work out the strips and the length off the roll.
The editor opens with this room, inside sizes and wall height, ready to draw the rest of the home.
No default from us: there is no neutral source for roll sizes. Use the numbers on your label.
- Area first, then sq ft
- Check the label on the roll
Divide the width of the room by the roll width and round up: that is the number of strips. Multiply by the length of the room for the length off the roll, and by the roll width for the square feet you buy. Divide by 9 for square yards. Updated · How we calculate
How we calculate
How we calculate
The floor area comes from our calculation core: length times width, exactly as for a room. Carpet comes off a roll in one width, so you buy whole strips. We try both directions and take the one that needs the least carpet.
We found no public, neutral source for roll sizes, so the calculator has no default number: type the numbers from the label or ask the store. Seams run along the roll; ask your installer where they go and how much to add for pattern matching.
| What | Figure |
|---|---|
| Roll width | No default: you type it from the label · No public source yet |
| Extra for pattern matching | Not added; ask your installer · No public source yet |
No public source yet for roll sizes, so the calculator has no default: type the numbers from your label.
Before you buy
Before you buy
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Ask for the roll width
A carpet can come in more than one roll width. The store can tell you which widths yours has.
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Mind the seams
A wider roll can mean fewer seams. Ask your installer where the seams go before you order.
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Measure into doorways
Measure to the middle of the doorway, and include closets the carpet runs into.
Other materials
Other materials
- Work it out →
Flooring calculator
How much flooring to buy for a room, with extra for cuts and waste.
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Tile calculator
How much floor tile to buy for a room.
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Paint calculator
How many gallons of paint a room takes.
- Open the calculator →
Room square feet
The area of every room, and the total for the home.
How much carpet do I need for a room?
Divide the width of the room by the roll width and round up for the number of strips. Multiply by the length of the room for the length off the roll, and by the roll width for the square feet you buy.
How do I turn square feet into square yards?
Divide the square feet by 9. One square yard is 3 × 3 ft.
What roll width should I use?
The width of your carpet, from the label or the store. We found no public, neutral source for standard roll widths, so the calculator has no default.
Does the calculator add extra for pattern matching?
No. Patterned carpet can need more; ask your installer how much.
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