Deck Board Calculator
Calculate how many deck boards, linear feet of decking, and deck screws you need from deck length, width, board width, gap, and waste %.
Open toolCarpet Calculator
Enter your room length and width, broadloom roll width, waste percentage, and unit price in the Carpet Calculator below to compute net and gross carpet area in sq ft, sq yd, and sq m, linear roll length, and total material cost.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate Carpet.
Your result
Enter your details
Result will appear here
How Carpet Calculator works
The Carpet Calculator multiplies room length by width to find net floor area, adds your trimming waste percentage, converts the total across square feet, square yards (sq ft / 9), and square meters, and divides by your carpet roll width to find the linear bolt cut.
Gross Area = (L * W) * (1 + Waste%/100); Sq Yards = Sq Feet / 9; Roll Length = Gross Area / Roll Width.
Also displays equivalent price per square yard alongside price per square foot (or square meter) so you can compare retailer quotes priced in different units.
Carpet Calculator Quick Reference & Input Guide
Review the input parameters, allowed value ranges, and worked reference cases for the Carpet Calculator below before running your calculation.
| Parameter / Scenario | Default / Sample Value | Rule or Allowed Range | Output / Usage Note |
|---|---|---|---|
| Input: Measurement unit | ft | Options: Feet (ft) -> sq ft & sq yd, Meters (m) -> sq m & sq yd | Required workspace parameter |
| Input: Room length | 15 | Range: 1 to 1000 | Required workspace parameter |
| Input: Room width | 12 | Range: 1 to 1000 | Required workspace parameter |
| Input: Carpet roll width | 12 | Range: 3 to 50 | Required workspace parameter |
| Worked Case 1: 15 x 12 ft bedroom on a 12 ft roll (10% waste, $4.50/sq ft) | Preloaded / test values | Net Area = Length * Width; Gross Area = Net Area * (1 + Waste% / 100); Square Yards = Square Feet / 9; Linear Roll Length = Gross Area / Roll Width | Net floor area is 180.00 sq ft (20.00 sq yd / 16.72 sq m). Adding 10% waste gives 198.00 sq ft (22.00 sq yd / 18.39 sq m), which equals a 16.50 linear ft cut off a 12 ft roll and costs $891.00 ($40.50/sq yd). |
| Worked Case 2: 5.0 x 4.0 m living room on a 4.0 m roll (10% waste, $35/sq m) | Preloaded / test values | Net Area = Length * Width; Gross Area = Net Area * (1 + Waste% / 100); Square Yards = Square Feet / 9; Linear Roll Length = Gross Area / Roll Width | Net area is 20.00 sq m. With 10% waste, gross area is 22.00 sq m (26.31 sq yd / 236.81 sq ft), requiring 5.50 linear meters off a 4.0 m roll at $770.00. |
How to use Carpet Calculator step by step
Measure your room at its widest points (including closet interiors and doorway transitions) before ordering.
Choose Feet or Meters and enter room dimensions
Select Feet (ft) or Meters (m) and enter the maximum room length and width.
Set broadloom roll width and waste %
Input the retailer's roll width (e.g., 12 ft or 4 m) and set a waste allowance (10% for rectangular rooms).
Enter unit price and review sq ft, sq yd, and cost
Enter the price per sq ft (or sq m) and click Calculate Carpet to see total area, square yards, linear roll cut, and estimated cost.
Worked examples for Carpet Calculator
See how a 15 x 12 ft bedroom and a metric living room translate into square yards and roll length.
15 x 12 ft bedroom on a 12 ft roll (10% waste, $4.50/sq ft)
Net floor area is 180.00 sq ft (20.00 sq yd / 16.72 sq m). Adding 10% waste gives 198.00 sq ft (22.00 sq yd / 18.39 sq m), which equals a 16.50 linear ft cut off a 12 ft roll and costs $891.00 ($40.50/sq yd).
5.0 x 4.0 m living room on a 4.0 m roll (10% waste, $35/sq m)
Net area is 20.00 sq m. With 10% waste, gross area is 22.00 sq m (26.31 sq yd / 236.81 sq ft), requiring 5.50 linear meters off a 4.0 m roll at $770.00.
Keep carpet nap (pile direction) consistent across seams
Carpet fibers lean slightly in one direction; all seamed pieces in a room must run in the same pile direction or the seam will show a light/dark color shift.
How to interpret the Carpet Calculator output
Check both Gross Area (with waste) and Linear Roll Length when comparing store quotes.
The headline result shows Gross Carpet Required in both square feet and square yards (plus square meters). Breakdown cards list Net floor area, Linear roll length to cut off the bolt, Equivalent price per sq yd, and Total estimated material cost.
Input limits, assumptions, and related tools
Account for stairs, tack strips, and seam placement in rooms wider than your roll.
If neither your room length nor room width is less than or equal to the roll width (for example, a 14 x 16 ft room on a 12 ft roll), your installer will need a lengthwise seam and extra roll length to fill the 2-foot strip.
Drywall Calculator
Calculate drywall sheets (4x8, 4x10, 4x12), wall and ceiling square footage, joint mud, tape, and screws from room dimensions and openings.
Open tool
Bias Tape Calculator
Calculate bias strip cut width, continuous bias fabric square dimensions, and bolt yardage for single-fold or double-fold bias tape.
Open toolMore free tools to try
Choose another tool for your next calculation, conversion, or text task.
Carry On Size Checker
Check measured luggage dimensions against supplied limits.
Open tool
Cartesian To Cylindrical Converter
Convert 3D Cartesian coordinates to cylindrical radius, azimuth and height.
Open tool
Camera Field Of View Calculator
Calculate horizontal, vertical, and diagonal camera field of view (FOV) in degrees and scene dimensions from sensor size, focal length, and distance.
Open tool
CBM Calculator
Calculate package and shipment volume in cubic meters (CBM) and cubic feet, plus sea/air volumetric weight and standard container fit.
Open toolCarpet Calculator: common questions
Answers about using Carpet Calculator and understanding its results.
How do I convert square feet of carpet into square yards?
Divide square feet by 9 (because 1 yard = 3 feet, and 3 ft * 3 ft = 9 sq ft per square yard). For example, a 15 x 12 ft room is 180 sq ft, which equals exactly 20.00 square yards before waste.
Why does carpet roll width (12 ft vs. 15 ft) matter when ordering?
Broadloom carpet is cut from a continuous factory roll of fixed width (most commonly 12 feet in North America or 4 meters in Europe/UK). Calculating the linear length off the roll (Area / Roll Width) tells you how many running feet or meters must be cut from the bolt.
How much extra carpet should I add for waste?
Add 10% for standard rectangular rooms to cover baseboard trimming, doorway thresholds, and nap orientation. Increase to 15% for L-shaped rooms, stairs, or patterned carpets that require repeat alignment.
How do I convert price per square yard to price per square foot?
Divide the price per square yard by 9. A carpet priced at $40.50 per square yard costs $4.50 per square foot.
Try your own values
Choose another tool for your next calculation, conversion, or text task.