How to Use This Calculator
- Measure the room boundaries: Use a tape measure to record length and width in feet.
- Select waste percentage: Add 10% for flooring cuts, seams, and trimming waste.
- Optional material pricing: Input unit cost per square foot to see total material purchase estimates.
Formula and Calculation Steps
Area (sq ft) = Length (ft) × Width (ft)
Area (m²) = Area (sq ft) × 0.092903
Total with Waste = Area (sq ft) × (1 + Waste% ÷ 100)
Estimated Cost = Total with Waste × Cost per Sq FtWorked Examples and Reference Table
| Dimensions | Square Footage | Square Meters | With 10% Waste |
|---|---|---|---|
| 10 ft × 10 ft | 100 sq ft | 9.29 m² | 110 sq ft |
| 12 ft × 14 ft | 168 sq ft | 15.61 m² | 185 sq ft |
| 15 ft × 20 ft | 300 sq ft | 27.87 m² | 330 sq ft |
| 20 ft × 25 ft | 500 sq ft | 46.45 m² | 550 sq ft |
Frequently Asked Questions
How do you calculate square footage?
Multiply the length of the room or area in feet by the width in feet: Length (ft) × Width (ft) = Area (sq ft).
How do you convert square feet to square meters?
Multiply square feet by 0.092903, or divide square feet by 10.764. For example, 100 sq ft is approximately 9.29 sq meters.
How do I calculate square footage of an L-shaped room?
Divide the L-shaped space into two separate rectangular sections. Calculate the square footage of each section individually, then add the two totals together.
What is the standard waste factor for flooring materials?
Most contractors recommend adding 10% for standard rectangular rooms, or 15% for rooms with angled walls, closets, or diagonal tile patterns.
How do you calculate total material cost from square footage?
Multiply the total square footage (including waste allowance) by the unit price per square foot of your selected flooring, turf, or drywall.