Carpet Calculator
Calculate the carpet area and estimate the cost for your flooring project. Enter room dimensions, choose your room shape, add a waste factor, and get instant results in square feet, square yards, and square meters.
What Is a Carpet Calculator?
A carpet calculator is a tool that helps you determine how much carpet you need for a room or building. It calculates the total square footage of carpet required, taking into account the room shape, carpet roll width, and a waste factor for cuts and seams.
This calculator supports four room shapes — Rectangle, Square, Circle, and L-Shape — and provides results in square feet, square yards, and square meters. It also estimates the total cost of carpet and installation.
How Does the Carpet Calculator Work?
The calculator uses standard geometric formulas to calculate area:
Rectangle: Area = Length × Width
Square: Area = Side²
Circle: Area = π × Radius²
L-Shape: Area = (A × B) + (C × D)
The calculator then:
- Applies a waste factor (default 10%) for cuts, seams, and pattern matching.
- Calculates the linear feet of carpet needed based on the roll width.
- Estimates the total cost including material and installation.
Why Use This Carpet Calculator?
- Four Shapes: Supports rectangle, square, circle, and L-shaped rooms.
- Unit Flexibility: Switch between imperial (feet, inches, yards) and metric (meters, centimeters).
- Roll Width Options: Choose standard carpet roll widths for accurate material estimation.
- Waste & Cost: Add a waste factor and estimate material and installation costs.
- Free & Private: No registration, no data storage.
❓ Carpet Calculator FAQ
How do I calculate carpet for a room?
Measure the length and width of the room, multiply them to get the area in square feet. Add 10-15% for waste and cuts. Use this calculator to do the math automatically.
What is a waste factor in carpet installation?
The waste factor accounts for cuts, seams, pattern matching, and off-cuts. The standard is 10-15%, depending on the room shape and carpet pattern.
What is the standard carpet roll width?
Standard carpet rolls are typically 12 feet wide. Some premium carpets come in 13.5 or 15-foot widths. Wider rolls can reduce the number of seams.
How do I calculate linear feet of carpet needed?
Linear feet = Total area with waste ÷ Carpet roll width. This tells you how many feet of carpet you need to purchase from the roll.
How much carpet do I need for a 12×12 room?
A 12×12 room is 144 sq ft. With a 10% waste factor, you need about 158 sq ft of carpet. With a 12 ft roll, that's about 13.2 linear feet.
How much carpet do I need for a 15×15 room?
A 15×15 room is 225 sq ft. With a 10% waste factor, you need about 248 sq ft of carpet. With a 12 ft roll, that's about 20.7 linear feet.
What is the difference between square feet and square yards?
1 square yard = 9 square feet. Carpet is often sold by the square yard. To convert, divide square feet by 9.
How do I convert square feet to square meters?
Multiply square feet by 0.092903 to get square meters. The calculator does this conversion for you.
How do I calculate carpet for an L-shaped room?
Divide the L-shaped room into two rectangles. Calculate the area of each rectangle and add them together. Use the L-shape mode in this calculator.
How much does carpet installation cost?
Installation costs vary by region, but typically range from $0.50-$2.00 per square foot. This calculator includes an optional installation cost field.
What is the best carpet for high-traffic areas?
Nylon carpet is durable and stain-resistant, making it ideal for high-traffic areas. Berber carpet is also a good choice for durability.
How do I measure a room for carpet?
Measure the length and width of the room at the longest points. For irregular rooms, break the room into sections and measure each section. Use the largest measurements for accuracy.
What is carpet padding and do I need it?
Carpet padding provides cushioning, extends carpet life, and improves insulation. It's typically sold separately and costs about $0.30-$0.60 per square foot.
How do I choose the right carpet for my home?
Consider the room's usage, traffic level, and your lifestyle. Nylon is durable, polyester is stain-resistant, and wool is luxurious. Also consider pile height, color, and pattern.
What is the average lifespan of carpet?
Quality carpet typically lasts 10-15 years with proper care and maintenance. High-traffic areas may need replacement sooner.
How do I clean carpet?
Regular vacuuming, immediate stain treatment, and professional cleaning every 12-18 months will extend your carpet's life. Use carpet-safe cleaning products.
What is the difference between loop pile and cut pile carpet?
Loop pile has uncut loops that are durable and easy to clean. Cut pile has cut loops that are softer and more luxurious but may show footprints more easily.