Carpet Calculator
Square yards of carpet and cost.
Enter your values
Enter the room length in ft.
Enter the room width in ft.
Enter the waste allowance in %.
Enter the price per square yard in $.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Carpet needed
- 22 sq yards
- Square feet with waste
- 198 sq ft
- Room area
- 180 sq ft
- Estimated material cost
- $704.00
- Padding needed
- 22 sq yards
Quick answer
Carpet is sold by the square yard in 12 ft rolls, so allow 10–15% waste for seams and offcuts.
Square yards = sq ft ÷ 9
At a glance
| What it does | Square yards of carpet and cost. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Room length, Room width, Waste allowance, Price per square yard |
| Main output | Carpet needed |
| Formula | Square yards = sq ft ÷ 9 |
| Cost | Free — no sign-up, no download |
How to use the Carpet Calculator
- 1Measure the room at its widest points.
- 2Add a waste allowance of 10–15%.
- 3Enter your price per square yard.
Inputs explained
- Room length(ft)
- Enter the room length in ft.
- Room width(ft)
- Enter the room width in ft.
- Waste allowance(%)
- Enter the waste allowance in %.
- Price per square yard($)
- Enter the price per square yard in $.
Worked example
Using the values the calculator loads with:
Inputs
- Room length15 ft
- Room width12 ft
- Waste allowance10 %
- Price per square yard32 $
Results
- Carpet needed22 sq yards
- Square feet with waste198 sq ft
- Room area180 sq ft
- Estimated material cost$704.00
- Padding needed22 sq yards
Frequently asked questions
Why 12 ft rolls?
Standard carpet width — rooms wider than 12 ft need a seam and more waste.
Is padding extra?
Yes, budget separately at $3–6 per square yard.
What do I need to enter into the Carpet Calculator?
Just 4 values: room length, room width, waste allowance, price per square yard. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Carpet Calculator work out the answer?
Carpet is sold by the square yard in 12 ft rolls, so allow 10–15% waste for seams and offcuts. It applies the formula Square yards = sq ft ÷ 9 and shows the working so you can check each step by hand.
Is the Carpet Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.