Carpet Area Measurement Calculator
Calculate the total carpet area needed for your room, accounting for waste from cuts and pattern matching.
Formulas Used
Net Room Area (sq ft) = Room Length × Room Width
Gross Area (sq ft) = Net Area × (1 + Waste Factor / 100)
Carpet Strips Needed = ⌈ Room Width ÷ Carpet Roll Width ⌉
Linear Feet of Roll = Strips Needed × Room Length × (1 + Waste Factor / 100)
Total Carpet to Purchase (sq ft) = Carpet Roll Width × Linear Feet
Area in Square Yards = Area in sq ft ÷ 9
Estimated Cost ($) = Total Purchased Area (sq yd) × Price per sq yd
Assumptions & References
- Room is assumed to be a simple rectangle. For irregular rooms, break the space into rectangles and sum the results.
- A standard waste factor of 10% is pre-filled; increase to 15–20% for rooms with many cuts, diagonal layouts, or large pattern repeats.
- Standard carpet roll widths are 12 ft or 15 ft in North America; 4 m (~13.1 ft) is common in Europe.
- 1 square yard = 9 square feet (carpet is traditionally sold by the square yard in the US).
- The number of strips is rounded up (ceiling function) to ensure full coverage across the room width.
- Price input is optional; leave blank to skip cost estimation.
- Reference: Carpet and Rug Institute (CRI) — Installation Standard CRI 104 recommends a minimum 10% overage for residential installations.