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Carpet Quantity Calculator — result sheet
Estimate net floor area and carpet quantity after an entered waste allowance.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Net area = length × width; order area = net area × (1 + waste rate/100).
The allowance covers cuts and installation waste; it is a planning quantity rather than a layout-optimized takeoff.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Room length — length units; minimum 1.0E-6; maximum 1000000
- Room width — length units; minimum 1.0E-6; maximum 1000000
- Waste allowance — %; minimum 0; maximum 1000
Worked example
| Input | Value |
|---|---|
| Room length | 5 |
| Room width | 4 |
| Waste allowance | 10 |
Net area = 20; order area = 22 square units.
Assumptions and limits
- The room is treated as one rectangle.
- Waste is applied as a percentage of net area.
- Seams, pattern matching, roll widths, doorways, and installer requirements are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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