Square Footage Calculator (Rooms, Flooring & Price Per Sq Ft)
Calculate total square footage (sq ft), square yards, square meters, flooring waste allowance, and total material cost from length and width.
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How to Use the Square Footage Calculator (Rooms, Flooring & Price Per Sq Ft)
To calculate square footage of any rectangular room, lawn, or wall, multiply the length in feet by the width in feet (Area = Length × Width). The most common mistake DIYers make is treating inches as base-10 decimals—for example, entering 18 feet 6 inches as ‘18.6’ instead of ‘18.5’ (since 6 ÷ 12 = 0.5 feet). Our calculator converts feet and inches automatically.
Formula and Calculation Methodology
- L_ft, W_ft: Whole feet measurements of room length and width
- L_in ÷ 12: Inches converted into decimal feet (e.g., 6 inches = 0.5 feet)
- Sq Yards: Square Feet divided by 9 (used for broadloom carpet ordering)
If you are measuring an L-shaped room or a full house floor plan with alcoves and closets, divide the floor plan into two or three separate rectangles, calculate the length × width of each section, and add the areas together. When ordering hardwood, luxury vinyl plank (LVP), or ceramic tile, always add a 10% waste factor to account for end-cuts around doorways and baseboards.
Inches to Decimal Feet Conversion Chart for Square Footage
| Inches | Fraction of a Foot | Decimal Feet | Inches | Fraction of a Foot | Decimal Feet |
|---|---|---|---|---|---|
| 1 inch | 1/12 ft | 0.083 ft | 7 inches | 7/12 ft | 0.583 ft |
| 2 inches | 1/6 ft | 0.167 ft | 8 inches | 2/3 ft | 0.667 ft |
| 3 inches | 1/4 ft | 0.250 ft | 9 inches | 3/4 ft | 0.750 ft |
| 4 inches | 1/3 ft | 0.333 ft | 10 inches | 5/6 ft | 0.833 ft |
| 5 inches | 5/12 ft | 0.417 ft | 11 inches | 11/12 ft | 0.917 ft |
| 6 inches | 1/2 ft | 0.500 ft | 12 inches | 1 ft | 1.000 ft |
Frequently Asked Questions
How do I calculate square footage if I measured in inches?
Multiply the length in inches by the width in inches to get total square inches, then divide that total by 144 (since 1 square foot = 12 in × 12 in = 144 sq in).
How do you convert square feet into square yards for carpet?
Divide your total square footage by 9, because 1 square yard measures 3 feet by 3 feet (9 square feet).
How much extra flooring should I buy for waste?
Add 10% extra square footage for standard straight-lay planks or tiles, and 15% extra for diagonal layouts, herringbone patterns, or rooms with many closets and angles.
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