Carpet Price per Square Foot Calculator

This carpet price calculator works out the total cost of carpeting a room based on the room’s dimensions and the carpet’s price per square foot. You enter the room length and width in feet, the carpet price per square foot, and optionally a waste percentage, and it returns the total square footage, the carpet you need to buy (including waste), and the total estimated cost. The tool also shows the price per square yard, since many carpet retailers quote prices by the square yard.

Formula

The calculator uses two basic formulas. First, the room area in square feet:

Area (sq ft) = Length (ft) × Width (ft)

Then the total cost:

Total Cost = Area × (1 + Waste% / 100) × Price per sq ft

Where:

• Length and Width are the room dimensions in feet.
• Price per sq ft is the carpet cost in dollars per square foot.
• Waste% is the extra carpet you buy to cover seams, cuts, and pattern matching (usually 5–15%).
• Total Cost is in dollars.

If you need the price per square yard (common in the US), multiply the per-square-foot price by 9.

Worked Example

Using the default values: a room 12 ft long and 10 ft wide, carpet priced at $3.50 per sq ft, and 10% waste.

1. Room area = 12 × 10 = 120 sq ft
2. Waste factor = 1 + 10/100 = 1.10
3. Carpet to buy = 120 × 1.10 = 132 sq ft
4. Total cost = 132 × $3.50 = $462.00
5. Price per sq yd = $3.50 × 9 = $31.50

So for this room, you would need 132 square feet of carpet and pay $462 before installation.

How to Use the Calculator

Follow these steps to get an accurate estimate:

1. Measure the room length and width in feet. Use a tape measure and measure to the nearest inch, then convert to feet (e.g., 12 ft 6 in = 12.5 ft).
2. Find the carpet price per square foot. If the price is given per square yard, divide by 9 to get per square foot.
3. Choose a waste percentage. For a simple rectangular room with no patterns, 5–10% is typical. For patterned carpet or rooms with many angles, use 15%.
4. Click calculate. The results show the room area, the carpet you need to buy, the total cost, and the price per square yard.

The calculator assumes a single rectangular area. For L-shaped rooms, divide the room into rectangles and add the areas together before entering as one combined length and width (or calculate each section separately).

Understanding the Results

The Room area is the actual floor space you want to cover. The Carpet to buy is always larger because of waste – the extra material needed for seams, trimming, and pattern alignment. The Total cost is the price of the carpet material only; it does not include padding, installation, removal of old carpet, or taxes.

If the result seems high, remember that carpet is often sold by the square yard. A price of $31.50 per square yard is equivalent to $3.50 per square foot. Many people are surprised by the difference, so always check which unit the price is quoted in.

Common Mistakes and How to Avoid Them

• Mixing units: If you measure in inches, convert to feet before entering. 1 ft = 12 in, so 120 in = 10 ft.
• Forgetting waste: Without a waste factor, you may buy too little carpet and have to pay for a second order (which may not match dye lots).
• Ignoring the direction of the pile: Carpet has a nap, and all pieces must run the same direction. This can increase waste significantly, especially in rooms wider than the carpet roll (usually 12 ft).
• Using the wrong price unit: Always convert to per square foot if the store quotes per square yard.

When to Use This Calculator

Use this tool when you are budgeting for new carpet in a single room, comparing quotes from different retailers, or deciding between different carpet grades. It is also helpful when you need to order carpet yourself and want to know how many square feet to request.

Keep in mind that this calculator gives a material-only estimate. Professional installation typically adds $1–$2 per square foot, and padding adds another $0.50–$1.50 per square foot. The final cost also depends on your location and the complexity of the job.

Frequently Asked Questions

How do I convert price per square yard to per square foot?

Divide the price per square yard by 9. For example, if a carpet costs $27 per square yard, it is $3 per square foot. The calculator does this conversion for you in the last output.

What is the average carpet price per square foot?

Basic carpet often runs $2–$5 per square foot, mid-range $5–$10, and premium $10 or more. Prices vary widely by material, brand, and retailer. This calculator works with any price you enter.

How much extra carpet should I buy for waste?

For a simple rectangular room, 5–10% is typical. If the carpet has a pattern that needs matching, or if the room has many corners, use 15%. Some installers recommend 20% for very complex layouts.

Does the calculator include installation cost?

No, it only calculates the cost of the carpet material. Installation, padding, and removal of old flooring are separate. Many stores quote a bundled price, so ask for a breakdown.

What if my room is not a perfect rectangle?

Divide the room into rectangles, calculate each area separately, and add them. Then enter the total area as if it were a single rectangle, but use a higher waste percentage (15%) to account for the extra cutting.

How do I measure a room for carpet?

Measure the length and width at the widest points, in feet, using a tape measure. Round up to the nearest half-foot. For irregular rooms, measure each section and add the areas together before using the calculator.

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in len | Room length | ft | 12 | 0
in wid | Room width | ft | 10 | 0
in price | Carpet price | $/sq ft | 3.50 | 0
in waste | Waste percentage | % | 10 | 0
out area | Room area | sq ft | len * wid | 2
out buy | Carpet to buy | sq ft | (len * wid) * (1 + waste / 100) | 2
out cost | Total cost | $ | ((len * wid) * (1 + waste / 100)) * price | 2
out per_yd | Price per sq yd | $/sq yd | price * 9 | 2