Carpet Calculator
Calculate carpet quantity, waste allowance, material weight, and installation cost for rooms of any shape.
Select shape, enter dimensions or area, and optional parameters.
Calculation Results
Fill in the room dimensions or direct area, waste factor, and optional parameters, then click Calculate.
Formula Details
Area calculations vary by Room Shape:Rectangle: Area = Length × Width Square: Area = Side × Side Circle: Area = π × (Diameter / 2)² L-Shaped: Area = (Section 1 L × Section 1 W) + (Section 2 L × Section 2 W) Other / Custom: User entered directly.
Length / WidthDimensions:Room dimensions measured in the selected unit (ft, yd, in, m, cm, mm).
Total Carpet Required = Floor Area × (1 + Waste Percentage / 100)Estimates the gross carpet surface area required for installation, including safety margin overlap, positioning adjustments, and edge trimming.
Floor AreaNet Floor Area:The calculated net floor space.Waste PercentageWaste Buffer:The safety margin percentage for cut pieces and seams (usually 10%).
Waste Allowance = Total Carpet Required - Floor AreaCalculates the additional carpet area that must be purchased specifically to cover cuts, irregular borders, and seam adjustments.
Total Carpet RequiredGross Area:Total carpet area to be ordered.Floor AreaNet Area:The net measured room area.
Estimated Cost = Total Carpet Required × Cost Per Unit AreaCalculates the overall cost of the carpet material based on the gross carpet area required (with waste) and price per square foot or square meter.
Cost Per Unit AreaMaterial Rate:Carpet price per square foot or square meter.
Calculation Example
Bedroom: Calculate carpet requirements for a rectangular bedroom measuring 12 feet wide by 15 feet long. Use a standard 10% waste allowance. Carpet costs $3.50 per sq ft, and carpet weight is 0.5 lbs/sq ft.
- 1.Calculate Floor Area.
Area = 12 ft × 15 ft = 180 sq ft (20.00 sq yd) - 2.Calculate Waste Allowance.
Waste = 180 sq ft × 10% = 18 sq ft (2.00 sq yd) - 3.Calculate Total Carpet Required.
Total Carpet = 180 sq ft + 18 sq ft = 198 sq ft (22.00 sq yd) - 4.Calculate Estimated Carpet Weight.
Weight = 198 sq ft × 0.5 lbs/sq ft = 99.0 lbs - 5.Calculate Estimated Material Cost.
Cost = 198 sq ft × $3.50 = $693.00
Living Room: Calculate carpet requirements for an L-shaped living room. Section 1 is 18 feet by 14 feet. Section 2 is 10 feet by 8 feet. Use a 12% waste allowance for irregular corners. Carpet cost is ₹60 per sq ft.
- 1.Calculate net floor area by adding both sections.
Area = (18 ft × 14 ft) + (10 ft × 8 ft) = 252 sq ft + 80 sq ft = 332 sq ft (36.89 sq yd) - 2.Calculate Waste Allowance.
Waste = 332 sq ft × 12% = 39.84 sq ft (4.43 sq yd) - 3.Calculate Total Carpet Required.
Total Carpet = 332 sq ft + 39.84 sq ft = 371.84 sq ft (41.32 sq yd) - 4.Calculate Estimated Material Cost.
Cost = 371.84 sq ft × ₹60 = ₹22,310.40
Office Space: Calculate carpet requirements for a commercial office lobby measuring 8.5 meters wide by 6.0 meters long. Use a 10% waste allowance. Carpet costs €24.00 per sq meter, and weight is 2.2 kg per sq meter.
- 1.Calculate Floor Area.
Area = 8.5 m × 6.0 m = 51.0 sq m - 2.Calculate Waste Allowance.
Waste = 51.0 sq m × 10% = 5.1 sq m - 3.Calculate Total Carpet Required.
Total Carpet = 51.0 sq m + 5.1 sq m = 56.1 sq m - 4.Calculate Estimated Weight.
Weight = 56.1 sq m × 2.2 kg/sq m = 123.4 kg - 5.Calculate Estimated Material Cost.
Cost = 56.1 sq m × €24.00 = €1,346.40
How to Use
Follow these step-by-step instructions to estimate your carpet requirements, waste factors, and installation budgets:
- Select the Room Shape: Choose from Rectangle, Square, Circle, L-Shaped, or Custom Area.
- Enter the Room Dimensions: Enter dimensions matching the selected shape, or directly specify the floor area if using Custom Area. Choose the appropriate unit (ft, in, yd, m, cm, mm).
- Enter the Waste Percentage: Adjust the slider to set your waste allowance (10% is standard for rectangular rooms, 12%–15% is recommended for L-shaped or circular rooms).
- Optionally Enter Carpet Weight and Cost: Enter optional weight per unit area (lbs/ft² or kg/m²) and carpet cost per unit area along with your currency selector.
- Click Calculate: Click Calculate to perform the estimations. Results will show together instantly on the right.
- Review All Calculated Results: Review the Floor Area, Waste Allowance, Total Carpet Required (with square yards equivalent for Imperial), Estimated Weight, and Estimated Cost.
Frequently Asked Questions
How much carpet do I need?
How much extra carpet should I buy?
What waste percentage is recommended?
How accurate is the carpet estimate?
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Calculations are estimates based on the values you enter and standard engineering formulas. Results are intended for planning and estimation only. Always verify critical measurements, specifications, and local building requirements before purchasing materials or beginning construction.